My father did not buy a new car.
Answer: C
Correct answer: A new car was not bought by my father.
The past simple negative did not buy becomes was not bought, with did absorbed into was. The present options change the tense, and was not be bought adds a second auxiliary.
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When I saw her, she was crossing the road.
Answer: C
Correct answer: When she was seen by me, she was crossing the road.
Only the first clause goes passive: I saw her becomes she was seen by me. The second clause has no object and cannot be made passive, so it stays exactly as it is.
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Did he not listen to his teacher?
Answer: C
Correct answer: Was his teacher not listened to by him?
Listen to is a prepositional verb, so to stays with the participle. The past simple question did he not listen becomes was his teacher not listened to, with did absorbed into was.
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Why does she always make lame excuses?
Answer: D
Correct answer: Why are lame excuses always made by her?
Lame excuses is plural, so the passive is are made, and always keeps its place before the participle. The question order puts the auxiliary first, which the first option omits.
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You have to finish this work as soon as you can.
Answer: D
Correct answer: This work has to be finished by you as soon as you can.
Have to expresses obligation and becomes has to be + participle, singular to agree with this work. Has been finished reports it as already done, which the obligation contradicts.
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The teacher asked me to learn the lesson by heart.
Answer: D
Correct answer: I was asked by my teacher to learn the lesson by heart.
Ask takes an object and an infinitive; the object becomes the subject and the infinitive is untouched. The past simple gives was asked; the present and continuous options change the tense.
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