The Reading and Writing half of a trial session: deciding punctuation between clauses by asking whether each side is a complete sentence, the comma splice and its four repairs, colons and matched pairs, subject-verb and pronoun agreement by crossing out what sits between, dangling modifiers, choosing transitions by naming the relationship first, answering vocabulary questions from context with a cover-and-predict routine, and the goal-based questions where true is not the same as correct.
Subject: SAT Prep · 70 slides · applied lesson
Open the interactive version of this deck · Homework for this lesson
Title
SAT Prep · trial session
The rules that carry the most questions, in the order worth learning them
Objectives
You named grammar and vocabulary, which is a useful thing to have named, because between them they are a large and very learnable share of this section.
Grammar on this test is a small set of rules asked repeatedly. It is not a general test of your English, and that is good news.
College Board — Digital SAT Suite Assessment Specifications: Standard English Conventions is about 26 percent of the Reading and Writing section — Standard English Conventions is about 26 percent of this section
Section
Section 1
Warm-up
One minute, out loud.
Discussion prompt
Read this aloud: 'The lab closed early, the samples were ruined.' Does it sound wrong to you?
Hint: Try reading each half on its own and asking whether it could stand as a sentence.
Answer:
For most people it sounds fine, because the pause is where a speaker would pause. That is exactly why the ear is unreliable here.
It is a comma splice: two complete sentences joined by a bare comma, which is never allowed. The test asks about this constantly, precisely because it sounds acceptable.
From here on the method is structural: ask whether each side is a complete sentence, then apply the rule. Do not read it aloud and decide.
The Chicago Manual of Style, 17th edition, chapter 6 (Punctuation) 6.19
Concept
Before choosing any mark, ask whether what sits on each side of it is a complete sentence, meaning it has a subject and a verb and could stand alone.
independent clause — A group of words with a subject and a verb that could be punctuated as a sentence on its own.
Once you know the answer for both sides, the rule is mechanical. There is nothing to feel out.
The Chicago Manual of Style, 17th edition, chapter 6 (Punctuation) chapter 6
Picture it
Work down this list. You will rarely get past the third box.
Figure (svg): A five step decision flow asking whether each side of the punctuation is a complete sentence and prescribing the mark accordingly
Concept
When both sides can stand alone, exactly four things are allowed: a period, a semicolon, a comma followed by one of the seven coordinating conjunctions, or a colon when the second half explains the first.
A comma on its own is not one of them. That error has a name, the comma splice, and it is the single most tested item in this domain.
The Chicago Manual of Style, 17th edition, chapter 6 (Punctuation) 6.19, 6.22, 6.57
Picture it
Same two clauses, four ways to join them legally.
Figure (svg): A comma splice on the left and four legal repairs on the right using a period, a semicolon, a comma with a conjunction, and a colon
Which of the four appears in the choices is not something you control. Recognising that the original is a splice is.
Concept
The rule is easier to trust once you have seen it break the same way six times. Every sentence on the left is wrong for exactly one reason.
| comma splice | one legal repair |
|---|---|
| The rain started early, the match was postponed. | The rain started early, so the match was postponed. |
| Marcus finished the essay, he never proofread it. | Marcus finished the essay; he never proofread it. |
| The map was outdated, we still reached the summit. | The map was outdated, but we still reached the summit. |
| She had one rule, nobody touched the controls. | She had one rule: nobody touched the controls. |
| The kiln cooled overnight, the glaze cracked anyway. | The kiln cooled overnight. The glaze cracked anyway. |
| Funding ran out in March, the survey was never finished. | Funding ran out in March, and the survey was never finished. |
Cover the comma in any left-hand sentence and read each half on its own. Both halves have a subject and a verb every time, which is the whole diagnosis.
The repairs are interchangeable in grammar but not in meaning: 'so' and 'but' also tell you how the halves relate, and a colon promises that the second half explains the first.
The Chicago Manual of Style, 17th edition, chapter 6 (Punctuation) 6.19
Picture it
Worth memorising as a word, because the comma rule depends on the list.
Figure (svg): The seven coordinating conjunctions for, and, nor, but, or, yet and so, shown as lettered cards spelling FANBOYS
The second example on that figure is the one people get wrong: 'She revised the draft and submitted it' has no second subject, so no comma.
Concept
Same conjunction, opposite punctuation, and the only thing that changed is whether the second half has its own subject.
| correct sentence | comma? | the reason |
|---|---|---|
| Priya drafted the proposal, and Daniel edited it. | comma | 'Daniel edited it' has its own subject and verb. |
| Priya drafted the proposal and edited it herself. | none | One subject, two verbs. Nothing complete follows. |
| The engine stalled, but the brakes held. | comma | 'The brakes held' could stand as a sentence. |
| The engine stalled but restarted within seconds. | none | 'restarted within seconds' has no subject. |
| Take the coast road, or you will miss the ferry. | comma | 'You will miss the ferry' is complete. |
| Take the coast road or the ferry. | none | 'the ferry' is a noun, not a sentence. |
Read the words after the conjunction and look for a subject. If you find one, the comma belongs; if you find only another verb, it does not.
The Chicago Manual of Style, 17th edition, chapter 6 (Punctuation) 6.22
Prediction
Read each half separately first.
Predict first
'The experiment ran for six weeks, the results were inconclusive.' What is wrong, if anything?
Correct: It is a comma splice.
Why: Both halves have a subject and a verb and could stand alone, so a bare comma cannot join them. A semicolon would work, as would a period, as would 'but' after the comma. The tense is consistent, so that option is a distractor testing whether you check the actual error.
Concept
A colon may introduce a list, an explanation, or a quotation, but only when what comes before it is already a complete sentence.
Correct: 'She brought three things: a map, a torch, and a spare key.' Incorrect: 'She brought: a map, a torch, and a spare key,' because 'She brought' cannot stand alone.
The Chicago Manual of Style, 17th edition, chapter 6 (Punctuation) 6.61
Trap
A list that looks like it wants a colon.
The kit includes: a compass, a whistle, and a map.
Put the colon straight after the verb
Why: It feels like the natural pause before a list, and that instinct is what the item is testing.
Break the rule invisibly
Why: 'The kit includes' is not a complete sentence, so nothing may follow a colon there.
Either remove the colon, or complete the clause before it.
The kit includes a compass, a whistle, and a map.
The kit includes three items: a compass, a whistle, and a map.
Test by covering everything from the colon onwards
Why: If what remains is a sentence, the colon is legal. If it is not, the colon is not.
Concept
Cover everything from the colon rightwards and read what is left. That is the entire test, applied five times below.
| sentence | legal? | what is left when you cover the colon |
|---|---|---|
| The team needed three things: rope, light, and time. | legal | 'The team needed three things' is a sentence. |
| The team needed: rope, light, and time. | not legal | 'The team needed' cannot stand alone. |
| His reasoning was simple: the cheaper route was faster. | legal | 'His reasoning was simple' is a sentence. |
| The main causes are: erosion, drought, and overgrazing. | not legal | 'The main causes are' is not a sentence. |
| There is only one exception: nobody enters after midnight. | legal | 'There is only one exception' is a sentence. |
Notice that rows two and four are the ones that feel most natural to write, because the colon lands exactly where a speaker would pause. That is why they are tested.
Both are repaired the same way: either delete the colon, or add a word or two so that the clause before it is complete.
The Chicago Manual of Style, 17th edition, chapter 6 (Punctuation) 6.61
Concept
A non-essential phrase dropped into the middle of a sentence is fenced off on both sides, and both fences must be the same kind: two commas, two dashes, or two parentheses.
Correct: 'The report, which ran to four hundred pages, arrived late.' Incorrect: 'The report, which ran to four hundred pages - arrived late.'
The test loves the mismatched pair, because only one of the two marks looks wrong and the eye tends to check only one.
| mismatched or unclosed | matched |
|---|---|
| The vote - which lasted four hours, ended in a tie. | The vote, which lasted four hours, ended in a tie. |
| Her first attempt, made without a map ended badly. | Her first attempt, made without a map, ended badly. |
| The samples, collected in June - were never tested. | The samples, collected in June, were never tested. |
| The route - longer but safer, was chosen. | The route - longer but safer - was chosen. |
Every one of those is repaired by looking for the partner of the first mark rather than by rereading the whole sentence. When you see one comma or one dash mid-sentence, go and find its twin.
The Chicago Manual of Style, 17th edition, chapter 6 (Punctuation) 6.28
Sorting
Read each half on its own and decide.
Sort into buckets
Is each side of the gap a complete sentence?
Notice how little the meaning mattered. Every one of those was decided by looking for a subject and a verb.
Pattern
Four steps, and they take about five seconds once they are automatic.
Do not read the sentence aloud to decide. The ear is what the question is exploiting.
The Chicago Manual of Style, 17th edition, chapter 6 (Punctuation) chapter 6
Check
Solve it on paper before you click.
Check your understanding
'The trail was closed for repairs ___ we took the longer route along the ridge.' Which fits?
Answer: A
Why: Both halves are complete sentences, so a comma plus a coordinating conjunction is legal, and 'so' matches the cause-and-effect relationship between them.
Section
Section 2
Concept
The noun sitting immediately before a verb is very often not its subject. Prepositional phrases get inserted precisely to create that illusion.
Cross out everything between the subject and the verb, then read what is left. The correct verb becomes obvious.
Khan Academy — Official Digital SAT Prep, Reading and Writing — Standard English Conventions
Picture it
The subject is 'collection', not 'coins'.
Figure (svg): The sentence about a collection of rare copper coins with the prepositional phrase struck through, leaving collection is valuable
Common insertions to strike: 'of the...', 'along with...', 'as well as...', 'in addition to...'. None of them changes the subject.
Prediction
Cross out the middle first.
Predict first
'The box of old photographs ___ on the top shelf.' Which is correct?
Correct: sits.
Why: The subject is 'box', which is singular, and 'of old photographs' is a prepositional phrase that can be struck out. Box sits. The plural 'photographs' is placed next to the verb to make the plural forms sound right.
Concept
Six sentences with the insertion marked. Read each one skipping the bracketed words and the verb chooses itself.
| sentence | real subject | verb |
|---|---|---|
| The list [of approved suppliers] is updated monthly. | list | is |
| A crate [of oranges] was left on the dock. | crate | was |
| The results [of the second trial] were inconclusive. | results | were |
| Every one [of the volunteers] has signed the form. | every one | has |
| The manager, [along with two assistants], reviews each file. | manager | reviews |
| Neither [of the applicants] meets the deadline. | neither | meets |
In five of the six, the noun nearest the verb has the opposite number to the real subject. That is not an accident of my examples; it is how the question is built.
The phrases worth learning to skip on sight: 'of the...', 'along with...', 'as well as...', 'in addition to...', 'together with...'. None of them can ever contain the subject.
Khan Academy — Official Digital SAT Prep, Reading and Writing — Standard English Conventions
Concept
Number agreement with what the pronoun replaces, the its and it's distinction, and pronouns whose reference is ambiguous.
| pronoun issue | wrong | right |
|---|---|---|
| number | Each student brought their book | Each student brought a book |
| its and it's | The dog wagged it's tail | The dog wagged its tail |
| ambiguity | When Ana met Jo, she was nervous | Ana was nervous when she met Jo |
For the second row: it's is always a contraction of it is or it has. The possessive has no apostrophe, which is the opposite of what nouns do.
The Chicago Manual of Style, 17th edition, chapter 6 (Punctuation) 5.44
Concept
Two of each kind, so the pattern is visible rather than asserted.
| incorrect | corrected | which error |
|---|---|---|
| Every player must bring their own kit. | Every player must bring a kit. | number |
| Each of the schools submitted their budget. | Each of the schools submitted a budget. | number |
| The committee published it's findings. | The committee published its findings. | its and it's |
| Its been raining since dawn. | It's been raining since dawn. | its and it's |
| When Rosa called Elena, she had already left. | Rosa had already left when she called Elena. | ambiguity |
| The chair told the treasurer that his figures were wrong. | The chair said that the treasurer's figures were wrong. | ambiguity |
Rows one and two are the same error as the verb rule: 'every' and 'each' are singular, and 'of the schools' strikes out exactly as it would before a verb.
For rows three and four, say the words out in full. If 'it is' or 'it has' fits, you want it's; if it does not, you want its. This is the one place your ear is allowed to help.
Rows five and six are not about grammar at all. Each sentence is legal; it simply does not say which person it means, and the repair rearranges rather than repunctuates.
The Chicago Manual of Style, 17th edition, chapter 6 (Punctuation) 5.44
Trap
A sentence with a phrase between the subject and the pronoun.
Each of the researchers submitted their findings separately.
Match 'their' to 'researchers'
Why: It is the nearest noun and it is plural, so the plural pronoun feels right.
Miss that the subject is 'each'
Why: 'Each' is singular, and 'of the researchers' is a prepositional phrase that can be struck out, exactly as with verbs.
Strike the phrase, then match the pronoun to what remains.
Each of the researchers submitted findings separately.
Use the same crossing-out technique as for verbs
Why: Subject and verb agreement and pronoun agreement are the same skill applied to two different words.
Recognise the singular words that look plural
Why: Each, every, either, neither, one, and anyone are all singular however many people they refer to.
Concept
An opening descriptive phrase describes whatever noun comes immediately after the comma. If that noun is the wrong one, the sentence says something absurd.
The Chicago Manual of Style, 17th edition, chapter 6 (Punctuation) 5.114
Picture it
In the left version, the rain was.
Figure (svg): Two versions of a sentence, one where the opening phrase dangles and attaches to the rain and one where it correctly attaches to the speaker
The test rarely makes it this funny, but the structure is identical, and checking the first noun after the comma catches all of them.
Concept
Read the opening phrase, then the first noun after the comma, and take the sentence literally. The middle column is what it actually says.
| as written | so it claims that | repaired |
|---|---|---|
| Running for the bus, my bag split open. | the bag was running for the bus | As I ran for the bus, my bag split open. |
| Written in 1890, historians still cite the pamphlet. | the historians were written in 1890 | Written in 1890, the pamphlet is still cited by historians. |
| Exhausted from the climb, the summit was a relief. | the summit was exhausted | Exhausted from the climb, we found the summit a relief. |
| While reviewing the budget, three errors appeared. | the errors were reviewing the budget | While reviewing the budget, we found three errors. |
| Having missed the deadline, the application was rejected. | the application missed the deadline | Because she missed the deadline, her application was rejected. |
Two repairs are available every time, and both appear above: put the right noun straight after the comma, or turn the opening phrase into a full clause with its own subject.
None of these five sounds wrong read aloud, which is the point. The check is mechanical: opening phrase, comma, first noun.
The Chicago Manual of Style, 17th edition, chapter 6 (Punctuation) 5.114
Error analysis
One sentence, one problem, and it is not the one most people point at.
Annotate
Nothing about the punctuation is wrong, which is why the eye slides past it. The check is structural: read the opening phrase, then look at the very next noun.
The Chicago Manual of Style, 17th edition, chapter 6 (Punctuation) 5.114
Check
Solve it on paper before you click.
Check your understanding
'Neither of the two proposals ___ the budget requirement.' Which fits?
Answer: A
Why: 'Neither' is the subject and it is singular, so the verb is singular. 'Of the two proposals' is a prepositional phrase to be struck out, and the plural noun in it is there to make the plural verbs sound correct.
Section
Section 3
Concept
A transition question gives you a sentence before and a sentence after. The answer is decided by the relationship between them, and there are only about four relationships to choose from.
Read both sentences, decide whether the second continues, contradicts, follows from, or illustrates the first, and only then look at the options.
Khan Academy — Official Digital SAT Prep, Reading and Writing — transitions in the Expression of Ideas domain
Picture it
The answer choices are usually one word from each group.
Figure (svg): Four relationship categories, continuation, contrast, cause and effect, and example, each paired with its transition words
That is why deciding the relationship first works so well: it eliminates three of the four choices before you have read them.
Concept
Cover the third column. Decide the relationship from the two sentences alone, and check whether your word lands in the same group as mine.
| the two sentences | relationship | a transition that fits |
|---|---|---|
| Ticket sales fell for a third year. ___, the festival cut its budget. | result | Consequently |
| The alloy resists corrosion well. ___, it is expensive to produce. | contrast | However |
| The library extended its hours. ___, it added forty study desks. | addition | Moreover |
| Some birds navigate by starlight. ___, the indigo bunting orients by the night sky. | example | For instance |
| The soil was too acidic for wheat. ___, the farm switched to blueberries. | result | Therefore |
Rows one and five are the same relationship with different words, which is the argument for learning groups rather than words: consequently, therefore, thus and as a result are one answer wearing four coats.
Row two is the one to study. The second sentence is not the opposite of the first, it is a limitation on it, and a limitation counts as contrast.
Khan Academy — Official Digital SAT Prep, Reading and Writing — transitions in the Expression of Ideas domain
Matching
Four transitions, four jobs.
Match the pairs
Why: Within a group the words are near-interchangeable for this test's purposes, so there is no need to learn fine distinctions between moreover and furthermore. The distinction that matters is which group.
Elimination
'The new filter removed most contaminants. ___, it did not affect dissolved metals.'
Eliminate the wrong options
Which word belongs in the blank?
Survives elimination: A
Why: The second sentence restricts the good news in the first, which is a contrast. Naming that before reading the options makes the choice immediate, and it also explains why the other three are all plausible-sounding and all wrong.
Section
Section 4
Concept
These questions never ask for a definition on its own. The surrounding sentence contains a clue that fixes the meaning, and finding the clue is the skill rather than knowing the word.
So the routine starts by ignoring the answer choices entirely, which feels wrong and is the whole point.
| sentence | the clue | a plain prediction |
|---|---|---|
| Although the trial was small, its findings were ___ enough to change practice. | although, plus small | strong, convincing |
| The instructions were so ___ that even the engineers disagreed about them. | engineers disagreed | unclear, open to two readings |
| Because the drug ___ the swelling, patients could walk within a day. | because, plus could walk | reduced, eased |
| Far from being rare, the beetle is ___ across the whole continent. | far from rare | everywhere |
| The second witness ___ everything the first had said. | second matches first | backed up, confirmed |
The words the test would offer for those five are compelling, ambiguous, mitigated, ubiquitous and corroborated. You did not need any of them to make the prediction, and that is the whole argument for predicting first.
Khan Academy — Official Digital SAT Prep, Reading and Writing — Words in Context, in the Craft and Structure domain
Picture it
Four steps, and the first one is physical.
Figure (svg): A four step routine covering the blank, predicting a plain word from context, uncovering and matching, and rereading the clue if two choices survive
Predicting a plain everyday word is fine and often better than predicting a sophisticated one. You are matching meaning, not register.
Worked example
'Although the committee had initially been enthusiastic, months of delay left them ___ about the project's prospects.'
Cover the blank and find the clue word
Why: 'Although' signals a contrast with 'enthusiastic', so the missing word must be roughly the opposite.
Predict a plain word
Why: Something like doubtful, or negative, or unsure. Do not try to guess which fancy word the test wants.
Uncover and match
Why: Among choices such as elated, pessimistic, indifferent and adamant, only pessimistic is close to doubtful.
Check the two survivors, if there are two
Why: Indifferent would mean they stopped caring, which the sentence does not say. Pessimistic matches the specific prediction.
Verify: by reading the sentence back with the word in place
Why: It reads sensibly and it honours the contrast that 'although' set up. If the completed sentence contradicts its own clue word, the choice is wrong however good the word sounds.
Picture it
One word in that sentence decided the answer before any choice was read.
Figure (svg): The example sentence with the word although boxed as the clue and enthusiastic marked as the anchor, leading to the predicted word doubtful
The clue words worth watching for: although, however, despite, because, since, and but. Each one tells you whether the blank agrees with the anchor or opposes it.
Concept
Ten words that recur. Learn these, then build the rest of your list from your own practice-test misses rather than from anyone's list.
| word | plain meaning |
|---|---|
| ambivalent | having mixed feelings, not indifferent |
| undermine | weaken gradually from underneath |
| ubiquitous | found everywhere |
| pragmatic | practical rather than idealistic |
| novel (adjective) | new, not a book |
| scrutinize | examine very closely |
| corroborate | support with evidence |
| mitigate | make less severe |
| elicit | draw out a response |
| disparate | fundamentally different |
The two that catch people are ambivalent, which means mixed rather than uninterested, and novel used as an adjective.
Merriam-Webster Dictionary, for the definitions in the high-frequency list — definitions checked against the dictionary
Sorting
Often the sentence only tells you the direction, and that is enough to eliminate two choices.
Sort into buckets
What is the general charge of each word?
When you cannot recall a word exactly, its charge is often enough. If the sentence needs something positive, every negative choice is gone.
Prediction
'The two accounts of the incident were so ___ that investigators struggled to reconcile them.'
Predict first
What plain word did you predict, and which choice matches?
Correct: disparate.
Why: The clue is 'struggled to reconcile them', which means the accounts were very different. A plain prediction such as 'different' or 'conflicting' leads straight to disparate. Corroborated is the trap: it relates to evidence and to accounts, but it means the opposite of what the sentence needs.
Concept
Some questions give you notes and then a sentence describing what the student wants to accomplish. Those questions are not about writing quality at all; they are about whether an option does exactly the stated job.
Underline the goal sentence. Then eliminate any choice that fails to do precisely that, no matter how true or how well written it is.
Khan Academy — Official Digital SAT Prep, Reading and Writing — Rhetorical Synthesis, in the Expression of Ideas domain
Picture it
The goal is to emphasise a similarity.
Figure (svg): A stated goal above four answer options, with the only one that emphasises a similarity marked correct and the others marked true but off-goal
This is the question type where reading the choices first costs the most, because every one of them is drawn from the notes and every one of them is accurate.
Pattern
Five routines. Each one replaces a guess with a check.
| question type | the routine |
|---|---|
| punctuation between clauses | is each side a complete sentence? |
| subject and verb | cross out what sits between them |
| pronoun | find what it replaces, then match number |
| modifier | check the first noun after the comma |
| transition | name the relationship, then pick from that group |
| vocabulary | cover, predict a plain word, then match |
| goal questions | underline the goal, eliminate anything off-goal |
College Board — Digital SAT Suite Assessment Specifications: Standard English Conventions is about 26 percent of the Reading and Writing section — the Reading and Writing domains
Check
Solve it on paper before you click.
Check your understanding
The stated goal is to explain the purpose of the second experiment. Which answer is correct?
Answer: A
Why: Only this option states what the second experiment was for. The others are all plausibly true statements drawn from the notes, and none of them explains a purpose.
Concept
A phrase is non-essential when removing it leaves the sentence still saying what it meant. Those get commas on both sides. Essential phrases, which narrow down which thing you mean, get no commas at all.
The comma is therefore carrying meaning rather than decorating. That is why the test can build a whole question on it.
The Chicago Manual of Style, 17th edition, chapter 6 (Punctuation) 6.27
Picture it
Two sentences, same structure, opposite punctuation.
Figure (svg): Two panels contrasting an essential clause with no commas against a non-essential clause fenced by commas
The first example needs the clause: without it the sentence claims all students score higher. The second does not: Ana is already identified by her name.
Concept
Five sentences. In each one, read it without the middle phrase and ask whether it still means the same thing.
| sentence | commas? | what happens if you remove the phrase |
|---|---|---|
| Students who finish early may leave. | none | It would claim all students may leave. The phrase is doing work. |
| Dr. Okafor, who finished early, left at noon. | both | Dr. Okafor still left at noon. Her name already identified her. |
| The bridge that carries the freight line is being repaired. | none | It would claim every bridge is being repaired. |
| The Severn Bridge, which carries the freight line, is closed. | both | The name identifies it, so the clause is extra. |
| Her second novel, published last spring, sold out. | both | 'Her second novel' already picks out one book. |
The pattern in the second column is worth naming: when the thing already has a name or a number, the phrase is almost always extra and gets both commas.
The 'that' and 'which' signal holds in all five rows, but treat it as a hint rather than a rule. Removing the phrase and rereading is the check that never misleads you.
The Chicago Manual of Style, 17th edition, chapter 6 (Punctuation) 6.27
Discrimination
Cover the phrase and read what is left.
Sort into buckets
Does each underlined-style phrase need commas around it?
Trap
A non-essential phrase fenced on only one side.
The report, which ran to four hundred pages arrived late.
Open the fence and never close it
Why: The opening comma is easy to place; the closing one is easy to forget, especially when the phrase is long.
Read past it without noticing
Why: The sentence still sounds fine aloud, which is exactly why this is tested.
Both fences, and both the same kind.
The report, which ran to four hundred pages, arrived late.
Check for the partner every time you see one comma mid-sentence
Why: Two commas, two dashes, or two parentheses. Never one of each.
Cover the fenced phrase and read the rest
Why: 'The report arrived late' is a complete sentence, which confirms the phrase was non-essential and the fences were right.
Concept
Within a passage the tense should stay put unless the meaning requires a shift. A question that offers four tenses of the same verb is usually testing consistency with the sentences around it, not grammar in isolation.
So read the sentence before and the sentence after. Whatever tense they use is almost always the answer.
| the surrounding passage | the tempting choice | the consistent choice |
|---|---|---|
| The crew mapped the reef in 1998. They ___ over nine hundred species. | have recorded | recorded |
| Ito publishes a column each Sunday. She ___ mostly about transit policy. | wrote | writes |
| The archive closed in 2011. The records ___ to Cardiff that autumn. | move | moved |
In all three the tempting choice is perfectly grammatical on its own. It is only wrong in company, which is why the sentence with the blank is the last place to look for the answer.
Khan Academy — Official Digital SAT Prep, Reading and Writing — form, structure and sense
Trap
A passage written in the past tense offers four options for one verb.
The researchers collected samples weekly. Each sample has been analysed within a day.
Pick the perfect tense because it sounds more careful
Why: Register is not what is being tested, and the more elaborate tense often reads as more correct.
Break the consistency with the surrounding sentences
Why: The passage is in the simple past, and nothing in the meaning calls for a shift.
Match the tense of the sentences around it.
The researchers collected samples weekly. Each sample was analysed within a day.
Read one sentence either side before choosing
Why: Those two sentences contain the answer far more often than the sentence with the blank does.
Shift tense only when the timeline demands it
Why: A genuine change in when something happened justifies a change in tense. Nothing else does.
Worked example
'The archive had been closed for renovation ___ researchers were redirected to the digital catalogue.'
Cover the gap and read what comes before
Why: 'The archive had been closed for renovation' has a subject and a verb, so it is a complete sentence.
Read what comes after
Why: 'Researchers were redirected to the digital catalogue' also has a subject and a verb. Both sides are complete.
Apply the rule
Why: Both complete means period, semicolon, colon, or comma plus one of the seven conjunctions. A bare comma is out.
Choose among the legal options by meaning
Why: The second follows from the first, so 'so' fits after a comma, and a semicolon would also be legal if offered alone.
Verify: by reading both halves separately
Why: Each one stands as a sentence on its own. If either had not, the whole analysis would have changed, and that check takes three seconds.
Picture it
You will use this figure more than any other in this deck.
Figure (svg): A comma splice and its four legal repairs using a period, semicolon, comma plus conjunction, and colon
Ranking
Five steps, and doing them out of order is what makes this feel like guesswork.
Put in order
Why: Meaning comes last, not first. Deciding by meaning before checking the structure is how a comma splice gets chosen: the meaning of the two clauses really is connected, and that has nothing to do with whether a comma may join them.
Fill the middle
Two complete sentences joined by a bare comma.
Fill in the blanks
The trail was icy, so we turned back at the ridge.
Why: Both halves are complete sentences, so the legal joins are a period, a semicolon, a colon, or a comma plus one of the seven coordinating conjunctions. A comma alone is the one thing that is never allowed.
Explain it
Two sentences, out loud.
Discussion prompt
How would you explain, without using the word clause, why a comma cannot join two sentences?
Hint: Compare the strength of the marks rather than naming the grammar.
Answer:
A comma is a pause inside a sentence. It is not strong enough to end one, so it cannot sit between two things that are each already a whole sentence.
If both halves could stand alone with a full stop between them, then a comma alone is too weak and you need a period, a semicolon, a colon, or a comma with a joining word.
The Chicago Manual of Style, 17th edition, chapter 6 (Punctuation) 6.19
Commit first
Answer, then rate your confidence honestly.
Predict first
'The museum, which opened in 1908 is closed for repairs.' What is wrong?
Correct: A closing comma is missing after 1908.
Why: The clause is non-essential, so it needs commas on both sides. One fence was opened and never closed. Note that swapping which for that would not fix it either: an essential clause would need both commas removed, not one.
Real world
Beyond the test.
Discussion prompt
Which of today's rules would you still use when writing a college application essay?
Hint: Which of these errors would a reader actually notice?
Answer:
All of them, but especially the clause rule and the modifier rule. A comma splice and a dangling modifier are the two errors a reader notices most and forgives least.
The transition routine is also directly useful: naming the relationship between two paragraphs before choosing the linking word is how essays stop reading like lists.
The vocabulary routine is the one that is test-specific. In your own writing, use the plain word rather than the impressive one.
Section
Section 6
Concept
A mid-September test gives about four weeks. Two sessions a week plus roughly twenty minutes a day is enough, provided the twenty minutes is aimed at your error log rather than at random questions.
College Board — Digital SAT Suite, including the Reading and Writing test description — official full-length practice for weeks three and four
Picture it
Math on the left of each row, Reading and Writing on the right.
Figure (svg): A four week plan table pairing math topics with reading and writing topics for each week, ending with full timed tests and an error-log review
The last line is the one to hold on to: scores move in steps, and a flat week is expected rather than a verdict.
Exit ticket
One honest answer, and it decides what we open with next time.
Predict first
Which of today's routines felt least natural?
Correct: Whichever you picked is where we start.
Why: Each one is a fifteen-minute drill, and the first is worth the most because punctuation between clauses carries more questions than anything else in this domain.
Connect it up
Twenty minutes, tonight or tomorrow.
Draw it
Go back through your practice test and pull out every word you were unsure of. Write each one with a plain-English meaning in your own words, and the sentence you met it in.
Ten a week, harvested from your own misses, beats any pre-made list, because these are the words at your actual level.
Recap
Six routines, and none of them requires you to know more English than you already do.
| never do this | do this instead |
|---|---|
| read it aloud and decide | check both sides for subject and verb |
| match the verb to the nearest noun | strike the phrase in between |
| read the transition choices first | name the relationship first |
| pick the vocabulary word that sounds smartest | match your own plain prediction |
| pick the truest answer on a goal question | pick the one that does the stated job |
College Board — Digital SAT Suite, including the Reading and Writing test description — official practice, and the site's SAT page for daily drilling
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