Sentence Correction: Concepts, Formulas, and Clear Examples
Sentence correction (SC) presents an underlined part or full sentence; choose the grammatically best version. Tests agreement, tense, modifiers, parallelism, comparisons, and idioms. One option is usually ‘no change’—pick it only if others introduce errors.
Read A (original) last after spotting errors in B–E to avoid anchoring bias. Track one primary error per question ( dangling modifier, pronoun antecedent, parallel list).
Subject–verb agreement
- Prepositional phrase between subject and verb: ‘The box of apples is heavy.’
- Either…or: verb agrees with nearer subject.
Modifier placement
Introductory phrase must modify the grammatical subject immediately after comma.
Example — Dangling modifier
Wrong: ‘Walking to office, the rain started.’ Right: ‘Walking to office, I noticed rain start.’ (Subject ‘I’ walks.)
Parallelism
- Lists and correlatives need same form: ‘to run, to swim, to cycle.’
- Compared items must be parallel: ‘skills of X to those of Y.’
Tense and conditional
- If unreal present: If I were rich, I would travel.
- Sequence of tenses in reported speech (basic level in aptitude).
Pronouns and comparisons
- Who vs whom: who as subject; whom as object (formal exam keys).
- Compare like with like: ‘salary of A to salary of B,’ not ‘to B.’
Concision vs grammar
Prefer clarity and grammar over mere shortness—only choose shorter if grammatically equal.
Step-by-step method for exam questions
- Scan for obvious agreement and tense errors in original.
- Check modifier at sentence start.
- Verify parallel structures in lists/correlatives.
- Compare options for idiom and prep changes.
- Eliminate choices fixing one error but adding another.
- Select best or ‘no error’ after full read.
Formula cheat sheet
| Situation | Formula | When to use |
|---|---|---|
| Dangling intro phrase | Subject must act | Modifier SC |
| Either…or verb | Match nearer subject | Agreement |
| Parallel list | Same verb form | Correlative |
| Comparison | Compare equivalent nouns | than/as |
| If I were | Subjunctive | Unreal conditional |
Frequently asked questions
Is ‘which’ vs ‘that’ tested?
Sometimes—restrictive (that) vs non-restrictive (which with comma) in formal keys.
Split errors across options?
Yes—re-read winner to ensure zero secondary errors.
British spelling in SC?
Follow option set consistency; don’t mix.
Practice on this platform
Use 4 practice sets (10 MCQs, detailed solution after each answer) and 2 timed mocks (20 minutes) on this topic to convert formulas into speed and accuracy.