Error Detection for SSC CGL | Rules & Practice

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Avoid common traps

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Summary Formula Tricks Mistakes Solved Example Practice FAQ

Error Detection revision for SSC CGL: identify the tested rule, check context, eliminate invalid choices and review errors.

Error Detection tests whether a sentence violates standard grammar or usage. Frequent SSC areas include subject-verb agreement, tense, articles, prepositions, pronouns, modifiers, comparison and parallel structure.

SSC CGL focus: Read the complete sentence or passage, identify the tested language rule, eliminate structurally invalid choices and then verify meaning in context.

Error Detection revision: rule → context → elimination → answer verification → error review.

Core rule
Context check
Common trap
Approved practice

Check in order: subject-verb agreement → tense → pronoun → article/determiner → preposition → modifier/comparison → parallelism.

Find the true subject before judging the verb. Words placed between the subject and verb often create the trap.

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Read the complete sentence or passage before finalising an answer.
Use grammar and context together rather than relying only on what sounds familiar.
After elimination, verify that the chosen option preserves the intended meaning.

Choosing an option only because it sounds familiar.
Ignoring contextual meaning while applying a grammar rule.
Using an absolute rule where standard English has an exception or usage constraint.

Practice example: Choose the part with an error: Neither of the two answers / are / correct.

Solution: The error is in 'are'; it should be 'is'.

Choose the part with an error: Neither of the two answers / are correct / in this case.
Identify the error: 'Every one of the reports / contain / a separate summary / of the findings.'
Identify the error: 'There is / many reasons / to revise the procedure / before implementation.'

Learn the shortcut first

Shortcut before you solve

Error spotting gets faster when you scan the sentence by grammar checkpoints instead of reading it casually.

Faster solving steps

Use this 4-step method before solving to keep your thinking fast and repeatable.

Step 1 Identify relation

Spot the pattern, relationship, or core idea first.

Step 2 Apply same pattern

Use the same rule instead of re-solving from scratch.

Step 3 Eliminate wrong options

Remove confusing choices before comparing the last few.

Step 4 Confirm final answer

Pick the option that matches the shortcut most cleanly.

Practice Questions

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Now apply the trick on real questions

Use the shortcut above before solving these questions

Check subject-verb agreement, tense, article, preposition, and pronoun in that order.

Tip: In many error-spotting questions, the first grammatical mismatch is the answer.

Step 1

Subject is He, so the helping verb should be does.

Step 2

The error is in 'do not'.

Rule

Match helping verbs with the subject before checking smaller grammar details.

3-second trick

Check the finite verb first in most short error-spotting questions.

Trap to avoid

Ignoring subject-verb agreement while focusing on less important words.

Correct answer

'do' should be 'does'

Thinking path

He is a singular subject.
Singular present simple takes does, not do.
So the error lies in the helping verb.

Final answer: 'do' should be 'does'

Why this is fast: Verb agreement often reveals the error before you inspect the full sentence.

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Q1 Medium

Identify the error: 'There is / many reasons / to revise the procedure / before implementation.'