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Question

The following question has a sentence with three underlined parts labelled (a), (b) and (c). Read each sentence to find out whether there is an error in any underlined part and indicate your response against the corresponding letter i.e., (a) or (b) or (c). If you find no error, your response should be indicated as (d).

No one knows (a) why he did it, (b) or who was behind his doing it.(c) No error. (d)

This question was previously asked in
CDS I 2017 General Knowledge Previous Year Paper (05-Feb-2017)
The correct answer is

D

Analyzing the Sentence Structure for Errors

The question asks us to identify any grammatical error in the underlined parts of the given sentence. The sentence is broken down into three parts: (a) No one knows, (b) why he did it, and (c) or who was behind his doing it. We need to examine each part carefully to determine if it follows correct English grammar rules.

Detailed Analysis of Each Part

Part (a): No one knows

This part of the sentence contains the subject "No one" and the verb "knows".

  • "No one" is considered a singular pronoun.
  • The verb "knows" is the third-person singular present tense form of the verb "to know", which correctly agrees with the singular subject "No one".

This part is grammatically correct.

Part (b): why he did it,

This is a clause starting with the question word "why". In this sentence, it functions as a noun clause, serving as the object of the verb "knows".

  • The structure within the clause is subject ("he") followed by the past tense verb ("did it").
  • This structure is correct for a noun clause in an indirect question (following a verb like "knows").
  • The comma at the end separates this clause from the next clause connected by "or".

This part is grammatically correct.

Part (c): or who was behind his doing it.

This is another clause, coordinated with the previous one by "or". It also functions as a noun clause, serving as the object of the verb "knows".

  • The clause starts with the question word "who", which acts as the subject of the verb "was".
  • The phrase "behind his doing it" is a prepositional phrase modifying the verb "was".
  • Inside the prepositional phrase, "doing" is a gerund (a verb ending in -ing used as a noun).
  • The pronoun "his" is a possessive pronoun modifying the gerund "doing".
  • It is grammatically correct to use a possessive pronoun (like his, her, its, our, their, my, your) before a gerund. This construction emphasizes the action performed by the person indicated by the pronoun. "His doing it" means "the action of him doing it".

This part is grammatically correct.

Conclusion: Identifying the Error

Upon analyzing each underlined part of the sentence, we found no grammatical errors in parts (a), (b), or (c).

Therefore, the sentence is grammatically correct as written.

Revision Table: Sentence Parts

Part Text Analysis Status
(a) No one knows Subject-verb agreement (singular subject "No one" with singular verb "knows"). Correct
(b) why he did it, Noun clause acting as object; correct structure for indirect question. Correct
(c) or who was behind his doing it. Noun clause acting as object; correct use of possessive pronoun before a gerund. Correct

Since no error is found in any of the underlined parts, the correct option is (d) No error.

Additional Information: Grammar Concepts Explained

Gerunds and Possessive Pronouns

A gerund is a verb form ending in "-ing" that functions as a noun. For example, "swimming is fun."

When a gerund is preceded by a pronoun, the possessive form of the pronoun is typically used, especially in more formal English. This clarifies whose action the gerund refers to.

  • Correct: We appreciated his coming to the meeting. (Not "him coming")
  • Correct: She was surprised by my winning the prize. (Not "me winning")

In the given sentence, "his doing it" follows this rule, correctly using the possessive "his" before the gerund "doing".

Noun Clauses

A noun clause is a dependent clause that functions as a noun within a sentence. They can act as subjects, objects, or complements.

Noun clauses are often introduced by words like "what," "who," "why," "how," "that," "whether," or "if."

In the sentence, both "why he did it" and "who was behind his doing it" are noun clauses acting as objects of the verb "knows". The structure within these clauses is typically the subject followed by the verb, even if the clause starts with a question word.

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