Foundation
English
Sentences
Sentences
Transformation of Sentences
Question
From the below-mentioned options, identify the sentence which is in passive voice:
He promised to meet me in the evening.
He was pleased with his performance in the examination.
He was asked to work hard by his teacher.
He kept me in the dark about his plans.
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Solution
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A sentence is in active or passive voice depending on whether its verb is in active or passive voice. A verb is in active voice when the subject does something or some action. A verb is in passive voice when something is done to the subject. In passive voice, the doer of the action may appear in the phrase, "by .....". This could be one easy way of identifying a sentence in passive voice. However, in some cases, this phrase is omitted.
The correct option is D. "He" is the subject. He "was asked" to work hard. i.e the action ("asked") was done to the subject. Note the phrase, "by his teacher" indicating the teacher as the doer of the action. Hence, this sentence is in the passive voice. 
In option A, "He" is the subject. The sentence says- He "kept" me in the dark i.e. the subject performed the action.  Hence, this sentence is in the active voice.  Option A is incorrect.
In option B, "He" is the subject. He "promised", i.e. the subject performed the action. Hence, this sentence is in the active voice. Option B is incorrect.
In option C, "He" is the subject. He "was pleased", i.e. the subject did the action. Hence, this sentence is in the active voice. Option C is incorrect.