V5 · Sentence Correction
Sentence Correction looks like a grammar test. It is not, quite — and treating it as one is why capable writers lose points on it.
You write for a living. You send emails that persuade, memos that land, documents that go to boards. You have a good ear. And a good ear is genuinely useful here, but it is not sufficient, because the format is built around a specific list of errors that native speakers make and do not hear.
Read this sentence at normal speed and decide whether anything is wrong with it.
The collection of manuscripts donated by the retired professor, which includes several volumes annotated in the margins by their previous owners, are being catalogued by two graduate students.
Most readers hear nothing. The sentence is orderly, the meaning is clear, and it sounds like something you might read in a report.
Now cross out every prepositional phrase and every clause set off by commas:
The collection ~~of manuscripts donated by the retired professor~~, ~~which includes several volumes annotated in the margins by their previous owners~~, are being catalogued.
The collection are being catalogued.
That is what the sentence says. The subject is collection, singular, and it takes is. Fourteen words and two plural nouns sit between the subject and the verb, and every one of them pulled your ear toward are.
You did not miss it because your grammar is weak. You missed it because you knew what the sentence meant, and comprehension repaired it before the error reached your attention. That repair is the thing this chapter has to switch off, for about ninety seconds at a time.
Here is the same item as it appears on the exam:
…are being catalogued by two graduate students.
- A are being catalogued by two graduate students
- B are catalogued by two graduate students
- C is being catalogued by two graduate students
- D have been catalogued by two graduate students
- E were being catalogued by two graduate students
Do not read the options as five sentences. Look at where they differ.
are · are · is · have · were
That split announces what the item is about. It is a subject–verb agreement question, and nothing else in those five options matters until that is settled. Find the subject, decide singular or plural, eliminate three options in ten seconds.
Most candidates read all five options in full, comparing them by ear, and take a minute over an item that should take forty seconds. Split-based elimination is the single most efficient technique in this format and it is available on almost every item.
The list is short.
Almost every Sentence Correction item turns on one of eight recurring axes — subject–verb agreement, modifiers, parallelism, pronouns, verb tense, comparisons, concision, idiom. Not eight rules; eight places to look. Once you can name them, you stop reading five options hunting for the one that sounds best and start looking for the one that is not broken.
That shift — from sounds right to is not broken — is what this chapter builds.
Option A is always the original sentence, which means one of your five options is always leave it alone. Roughly one item in eight is correct as written.
Candidates who have decided in advance that something must be wrong will find an error that is not there and change a correct sentence. It is the most common avoidable error in this format, and this chapter’s practice includes correct-as- written items specifically to train it out.
By the end you will read the sentence rather than the underline, find the split among the options, name the axis it announces, and settle one thing at a time. Forty seconds an item, and the time you save here is the time Reading Comprehension needs.
- Read the whole sentence, not just the underlined part. The error is often a mismatch between the underlined portion and something outside it: a subject twelve words earlier, a modifier at the front, the second half of a comparison. Reading only the underline hides exactly the errors this format is built on.
- Find the split. Scan the five options and notice where they diverge. If three options say is and two say are, the item is testing subject–verb agreement, and you can settle that question and eliminate two or three options before considering anything else.
- Decide the axis, not the whole sentence. Resolve one split at a time. Eliminate. Then find the next split among what survives.
- Read your choice back into the full sentence. Ten seconds. It catches the case where you fixed the split you noticed and introduced a second error you did not.
The options tell you what the item is about. Finding where they split converts a long sentence into one grammatical question — and usually eliminates two or three choices before you have read any of them in full.
- Reading each of the five options in full, one after another. That is five long sentences and no structure. Split-based elimination is faster and more reliable.
- Choosing by sound. Sound is a tiebreaker, not a method — and on the items that separate scores, the wrong answer usually sounds better than the right one, because it is shorter or more familiar.
The most common axis, and it is almost never hard once you find the subject. The whole difficulty is that the exam puts distance between the subject and the verb.
The collection of manuscripts donated by the retired professor, which includes several volumes annotated in the margins by their previous owners, is being catalogued by two graduate students.
The subject is collection, singular. Fourteen words and two plural nouns (manuscripts, volumes) sit between it and the verb, and every one of them pulls your ear toward are.
The technique: strip the sentence down. Cross out every prepositional phrase and every clause set off by commas. What remains is the skeleton — The collection … is being catalogued.
- Prepositional phrases. A subject is never inside of, with, along with, as well as, in addition to. "The report, along with its appendices, is ready."
- Collective nouns. Committee, team, board, group, number — singular in this format. Note the pair: the number of is singular, a number of is plural.
- Neither/nor and either/or. The verb agrees with the nearer subject. "Neither the harbourmaster nor the pilots were informed." Reverse the order and it becomes was.
- Inverted sentences. When the verb comes first, find the subject after it. "There are several reasons for the delay" — reasons is the subject.
A modifier attaches to whatever sits next to it. When the writer intended something else, the sentence says something the writer did not mean — and your brain repairs it silently, which is why this axis is so effective.
Having been buried under volcanic ash for nearly two millennia, archaeologists found the frescoes remarkably well preserved.
Read literally: the archaeologists were buried for two millennia. You knew what was meant, which is precisely the problem.
The fix is to make the frescoes the subject: "the frescoes were found by archaeologists to be remarkably well preserved."
Whenever a sentence opens with a modifying phrase and a comma, look at the very first noun after the comma. That is what the phrase describes. If it is the wrong thing, the sentence is broken regardless of how it sounds.
Misplaced modifiers are the milder version — the phrase is not dangling, just sitting next to the wrong noun. "She reported the accident to the officer wearing a torn jacket." Who is wearing the jacket?
- Which refers to the noun immediately before it. A which clause that means to describe the whole preceding idea is usually the error.
- Phrases beginning unlike, like, as, rather than, instead of must be followed by something comparable to what they name. "Unlike the coastal populations, the inland bears consume…" — populations and bears, both animals. "Unlike the coastal populations, the inland bears' diet…" compares populations to a diet.
Elements joined by and, or, but, than, as, or a list must share the same grammatical form.
Three infinitives. Break one — "and operating a two-way radio" — and the sentence is wrong even though the meaning survives.
Where to look: at the conjunction. Whenever you see and or or, check what sits on each side. They should be the same kind of thing: two nouns, two infinitives, two clauses, two -ing forms.
The exam tests these more than any other parallelism shape:
| Pair | What follows each half must match |
|---|---|
| not only … but also | not only to reduce costs but also to improve service |
| both … and | both in design and in execution |
| either … or | either accept the terms or withdraw |
| neither … nor | neither the cost nor the delay |
| not … but | not a failure but a delay |
Two failures, and the second is the one people miss.
Agreement. A pronoun matches its antecedent in number. Collective nouns take it, not they — a company is it, and so is a committee, a board, and a team.
When the city council presented its transport plan to the neighbourhood association, they objected that it had not consulted residents in the eastern districts.
They could be the council or the association. It could be either as well. A reader can work out the intended meaning; the format does not accept that as sufficient.
The fix here is not a better pronoun — it is a noun: "the association objected that the council had not consulted…". When ambiguity cannot be resolved by choosing a different pronoun, the correct option usually names the thing.
Where ambiguity hides: sentences with two nouns of the same number and gender. If a sentence has two singular nouns and then it, check whether it could plausibly point at either.
When two past events happen in sequence, the earlier one takes the past perfect.
The storm moved before the team arrived. Had moved marks that order. Write moved and the sequence collapses — the two events become simultaneous.
The trigger words: by the time, before, after, when, until, previously, earlier. When one of these joins two past events, check whether the earlier one needs had.
But do not over-apply it. If the sequence is already clear from the conjunction, plain past is often correct and the past perfect is unnecessary clutter. The exam tests both directions: sometimes the answer adds had, sometimes it removes it.
- Since and for with the present perfect. "The observatory has recorded seismic activity since 1974" — an action beginning in the past and continuing. Plain past would say the recording stopped.
- Conditionals. If + past, would + base: "If the levee failed, the lower fields would flood." Mixing would into the if clause — "if the levee would fail" — is a standard wrong answer.
The rule is one line: compare like with like. The exam breaks it by comparing a thing to a property of another thing.
That of stands in for the migration route of, so the sentence compares route to route. Drop it — "longer than the sooty shearwater" — and the sentence compares a route to a bird.
| Form | Stands for |
|---|---|
| that of | a singular noun already named |
| those of | a plural noun already named |
| do / does / did | a verb already named |
The other axis: like versus as. Like introduces a noun: "Like her predecessor, she began with a review of procurement." As introduces a clause with a verb: "As her predecessor had done, she began with a review." If what follows contains a subject and a verb, you need as.
And the third: comparison words must match their structure. More … than, as … as, the same as, different from. Mixing them — more than … as, or different than — is a reliable wrong answer.
Practise this axis 10 isolated drills · 8 full items · a diagnosis of what you missed →Between two options that are both grammatically correct and mean the same thing, the shorter one wins. This is not a stylistic preference in this format; it is a decision rule.
Against: "due to the fact that it lacked any provision for." Both are correct English. One is nine words shorter and says the same thing.
| Wordy | Concise |
|---|---|
| due to the fact that | because |
| in the event that | if |
| at this point in time | now |
| has the ability to | can |
| is capable of doing | can do |
| in order to | to |
| the reason is because | because |
| there are many who believe | many believe |
Redundancy is the related failure. Cooperate together, advance planning, revert back, the reason is because — each says the same thing twice, and an option containing one is out regardless of its other merits.
Shortest is a tiebreaker between grammatically equal options. A shorter option that is broken is still broken. Check the grammar first; use length only to choose between survivors.
Some constructions are correct because English does it that way, with no rule to derive them from. These are the items where your ear does the work — and where a non-native speaker is at the largest disadvantage.
| Correct | Not |
|---|---|
| capable of doing | capable to do |
| responsible for | responsible of |
| prohibit from doing | prohibit to do |
| credit X with Y | credit X for Y |
| attribute X to Y | attribute X with Y |
| different from | different than |
| consistent with | consistent to |
| regard as | regard to be |
| so … that | so … as to |
| not only … but also | not only … but too |
| more … than | more … as |
| range from X to Y | range between X to Y |
| between X and Y | between X to Y |
| estimated to be | estimated at being |
| the ability to do | the ability of doing |
Do not memorise the list cold. When you get an idiom item wrong, write both versions — the correct one and the one you chose — on a single line. Reading your own errors back is far more effective than reading a general list, because the ones you get wrong are a much shorter list than the ones that exist.
Every error this chapter has described, in one place. Nine traps across eight axes — and note that the first three are about method rather than grammar, which is where most of the losses actually are.
The underlined portion is what the options replace, and option A always repeats it exactly — so choosing A means the sentence is already correct. Read the whole sentence, find where the options split, and settle one axis at a time.
Strip the sentence: The collection … is being catalogued. The subject is collection, singular. Manuscripts and volumes are both inside modifying phrases and neither can be the subject. B and E get the number wrong; D changes the aspect from ongoing to completed, which contradicts the sense of work in progress. The split across the options — are versus is versus have — announces the axis immediately.
The opening phrase describes whatever noun follows the comma. In A that is archaeologists, so the sentence says the archaeologists spent two millennia under ash. D puts the frescoes in that position, which is what was buried.
B and C both begin with grammatical placeholders — it, the archaeologists’ discovery — neither of which was buried under ash. E puts frescoes in the sentence but as part of a bloated construction that still reads awkwardly and buries the subject.
The gap. One frame governs everything: requires new rangers to… — and the first element, to identify local plant species, fixes the series as infinitives. The underline holds elements two and three, which changes the job: the repair has to deliver a matching pair, not fix one slot. Options that mend one element while breaking the other are the item’s whole population of traps.
The answers.
(A) keeps the second infinitive and lets the third drift to operating — the stem’s own flaw, unrepaired at the classic breaking point, the last element.
(B) is the half-repair: it fixes the ending — to operate — by breaking the middle, sliding demonstrating into the second slot. Detection rewarded, verification skipped.
(C) abandons the series entirely: they must operate starts an independent clause inside a three-part list that one verb was supposed to govern.
(D) breaks both slots at once — a bare demonstrate with no to, then operating — the series dissolved rather than drifted.
(E) — correct. To demonstrate competence in first aid, and to operate a two-way radio. Both underlined elements as infinitives, completing the series the first element began. Read the frame through: requires new rangers to identify…, to demonstrate…, and to operate… — one governor, three matching complements.
Two pronouns, both ambiguous: they could be council or association, it likewise. C fixes only it, leaving they ambiguous. E fixes only they, leaving it ambiguous — and reading it naturally, it now points at the association, reversing the meaning. D uses it for the association and they for the council, which is grammatically odd and no clearer. B names both parties and removes the ambiguity entirely, which is longer than the alternatives and still correct: clarity outranks concision.
Two past events. The storm moved and the visibility improved before the team arrived, and by the time is the trigger. The earlier events take the past perfect. A leaves both in plain past, collapsing the sequence. B suggests the events were still under way. D shifts to present perfect, inconsistent with a narrative in the past. E applies had to one of the two paired events and not the other, breaking parallelism inside the fix.
No change needed. That of stands in for the migration route of, so the sentence compares route to route. B compares a route to a bird. C leaves the possessive dangling. D uses the plural those for a singular antecedent (route). E swaps a working comparison for a vaguer construction.
Worth noticing: this is the item where expecting an error costs you. If you have decided in advance that something must be wrong, you will change a correct sentence.
All five are attempts at because. D says it in one word. A, B and E are all variants of due to the fact that — nine words for one. C is ungrammatical: because of takes a noun, not a clause with a subject.
Note the order of operations from V5.8: C is eliminated on grammar, not on length. Then among the survivors, the shortest wins.
Capable takes of plus a gerund. There is no rule to derive this from; it is what the construction is. A, C, D and E are all reasonable-looking alternatives and all wrong.
With neither … nor, the verb agrees with the nearer subject — pilots, plural. That eliminates A and C. B is singular in a different disguise. D is plural but changes had been dredged to was dredged, losing the past perfect that marks the dredging as earlier than the failure to inform. E gets both right.
Unlike the coastal populations must be followed by something comparable to populations — that is, animals. A, D and E all put a diet in that slot, comparing populations to a diet. B puts berries and roots there, comparing populations to food. Only C makes the inland bears the subject.
C is also the longest of the five, which is the point: concision is a tiebreaker between correct options, never a reason to choose a broken one.
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Read the whole sentence, find where the options split, and settle one axis at a time. You are not looking for the version that sounds best — you are looking for the one that is not broken.
V1 through V5 cover the three Verbal formats: the anatomy of an argument, the eight Critical Reasoning types, how to read a passage, the six Reading Comprehension types, and Sentence Correction. The deeper practice sets for each are being written as separate blocks.