34. Error Detection

Overview

Identifying grammatical mistakes embedded in sentences is a fundamental skill assessed in competitive language examinations. Candidates must develop a sharp awareness of how words interact within a sentence to expose hidden errors. A systematic command of grammar rules—covering tenses, articles, prepositions, and agreement—forms the backbone of success in this section. Consistent practice across diverse question types is the most reliable path to building speed and accuracy.

Definition

Error detection is a grammar evaluation technique in which test-takers examine given sentences or passages to locate and identify violations of standard English grammar rules. Proficiency in this area demands a solid grounding in grammatical principles such as subject-verb agreement, correct tense usage, appropriate article placement, and proper word forms, so that deviations from standard usage can be recognized quickly and confidently.

Key Rules

  1. 1. Subject-Verb Concord

    The verb in a clause must match its true subject in number; intervening phrases or clauses placed between subject and verb do not affect this requirement.

    Show example Example

    The list of pending tasks has been reviewed by the project coordinator.

  2. 2. Tense Consistency

    Verb tenses within a sentence should remain uniform unless a deliberate and logical shift in time frame is intended by the writer.

    Show example Example

    The engineer submitted the report and then briefed the director on the findings.

  3. 3. Article Usage

    Select 'a' before words beginning with a consonant sound and 'an' before words beginning with a vowel sound; use 'the' when referring to something specific or uniquely identified.

    Show example Example

    It was an unusual opportunity, and she was the first candidate to seize it.

  4. 4. Infinitive and Participle Form

    An infinitive must pair 'to' with the bare base verb, while a participle phrase must logically attach to the noun it is meant to describe to avoid a dangling modifier.

    Show example Example

    Determined to succeed, she practiced daily until her technique was flawless.

  5. 5. Correct Preposition Use

    Prepositions must align with both the idiomatic conventions of the language and the specific meaning intended; substituting one preposition for another often changes meaning or creates an error.

    Show example Example

    The board agreed on a new strategy after debating the proposal for several hours.

  6. 6. Pronoun-Antecedent Agreement

    A pronoun must correspond to its antecedent in number, gender, and person so that the reference is unambiguous to the reader.

    Show example Example

    Every candidate submitted his or her application before the deadline.

  7. 7. Correct Part of Speech

    Words must be deployed in the grammatical role the sentence demands; for example, using an adjective where an adverb is needed distorts meaning and creates a detectable error.

    Show example Example

    The scientist explained the phenomenon clearly so that everyone in the room could follow.

Example Sentences

  1. Example 1

    Exhausted after the long journey, the travelers checked into the nearest hotel.

    Why this works

    Shows a correctly attached participial phrase whose logical subject matches the main clause subject 'travelers'.

  2. Example 2

    Neither the principal nor the teachers were informed about the sudden schedule revision.

    Why this works

    Illustrates the rule that when subjects are linked by 'neither...nor', the verb agrees with the subject closest to it.

  3. Example 3

    The board reached its unanimous decision after three hours of deliberation.

    Why this works

    Demonstrates that a collective noun functioning as a single unit takes a singular pronoun 'its'.

  4. Example 4

    My colleague prefers walking to the office rather than driving every morning.

    Why this works

    Shows the correct preposition 'to' following the verb 'prefer' instead of the commonly misused 'than'.

  5. Example 5

    If she were appointed team lead, productivity across the division would likely improve.

    Why this works

    Demonstrates the subjunctive mood using 'were' for a hypothetical or counterfactual condition.

Common Errors

  • more taller.

    Apply only one comparative marker at a time: either the '-er' suffix or 'more', never both (e.g., use 'taller' or 'more impressive', not 'more taller').

    Why?

    Using 'more' alongside a comparative adjective already marked with '-er'

  • I prefer tea than coffee.

    I prefer tea to coffee.

    Why?

    Using 'than' after the verb 'prefer'

  • Confusing the possessive 'its' with the contraction 'it's'.

    Use 'its' to show ownership (e.g., 'The dog wagged its tail') and reserve 'it’s' solely for the contracted forms of 'it is' or 'it has' (e.g., 'It’s raining').

  • One of the chairs are broken.

    One of the chairs is broken.

    Why?

    Attaching a plural verb to subjects beginning with 'one of the' followed by a plural noun

Key Takeaways

  • Locate the grammatical subject of each clause before selecting the correct verb form to ensure proper agreement.
  • Keep verb tenses uniform throughout a sentence unless a deliberate, logical time shift is present.
  • Articles and prepositions are small words that carry significant grammatical weight and are frequent sources of exam errors.
  • Analyze each clause of a complex sentence separately to apply grammar rules with greater precision and confidence.

Practice - Set 1

  1. Find the part of the sentence that contains a grammatical error: 'The package containing (A) / the documents and files (B) / were delivered to (C) / the wrong department. (D)'

  2. Identify the segment containing an error: 'Neither the manager (A) / nor the employees was (B) / satisfied with the (C) / new workplace policy. (D)'

  3. Find the segment with a grammatical error: 'Despite of their (A) / best efforts, the (B) / team could not (C) / win the championship. (D)'

  4. Identify the part of the sentence that contains an error: 'She walked slow (A) / down the corridor (B) / to avoid making (C) / any loud noise. (D)'

  5. Find the segment containing a grammatical error: 'Although he is (A) / very hardworking, but (B) / he rarely gets (C) / any appreciation. (D)'

  6. Identify the part containing an error: 'Each of the participants (A) / were given a (B) / certificate of attendance (C) / after the seminar. (D)'

  7. Find the segment with a grammatical error: 'He has been (A) / working in this (B) / company since (C) / five years now. (D)'

Practice - Set 2

  1. Identify the segment containing an error: 'If I was you, (A) / I would have (B) / accepted the job (C) / offer immediately. (D)'

  2. Find the part with a grammatical error: 'The historical monument (A) / is located on (B) / the bank of (C) / a Ganges river. (D)'

  3. Identify the part containing an error: 'She is looking forward (A) / to meet the (B) / new director of (C) / the department. (D)'

  4. Find the segment with a grammatical error: 'The news about (A) / the recent floods (B) / were shocking to (C) / the entire nation. (D)'

  5. Identify the segment containing an error: 'He is one of those (A) / scientists who has (B) / dedicated their career (C) / to climate research. (D)'

Live speaking practice

Speak it out: Error Detection

You are at a study cafe in Bengaluru, preparing for a competitive government exam with your study partner. You are reviewing a practice essay draft to identify and correct grammatical errors before submission.

Intermediate ~5 min Your own free AI key

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