Select the correct passive voice of: 'They could not understand the problem.' MCQ with Answer and Explanation

Select the correct passive voice of: 'They could not understand the problem.'
A. The problem could not understood by them.
B. The problem could not be understand by them.
C. The problem could not be understood by them.
D. The problem cannot be understood by them.
Answer: Option C
Solution (By JKSSB Mock Tests)
Modal negative 'could not': Object + could + not + be + past participle + by + subject.

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Practice More Active and Passive Voice Questions

Question #1
The audience was listening to the speaker attentively.
A. The speaker was being listened to attentively by the audience.
B. The speaker had been listened to attentively by the audience.
C. The speaker is being listened to attentively by the audience.
D. The speaker was listened to attentively by the audience.

Correct Answer: Option A


Explanation:
Past continuous + phrasal verb → was being listened to.

This question belongs to: English Active and Passive Voice
Question #2
Choose the correct active voice of: 'A letter may be written by me.'
A. I might write a letter.
B. I may write a letter.
C. I can write a letter.
D. I would write a letter.

Correct Answer: Option B


Explanation:
Modal 'may' passive 'may be written' → active 'I may write a letter'.

This question belongs to: English Active and Passive Voice
Question #3
She could not comprehend the difficult lecture.
A. The difficult lecture could not be comprehend by her.
B. The difficult lecture could not be comprehended by her.
C. The difficult lecture could not comprehended by her.
D. The difficult lecture cannot be comprehended by her.

Correct Answer: Option B


Explanation:
Could + V1 → could be + V3.

This question belongs to: English Active and Passive Voice