Change into passive voice: I doubt his sincerity.
AHis sincerity doubted by me.
BHis sincerity was doubted by me.
CHis sincerity is doubted to me.
DHis sincerity is doubted by me.
Explanation
– Verbs expressing mental states, like ‘doubt’, follow the standard ‘by + agent’ passive structure.
– Present tense passive uses ‘is/are + past participle’.
– Correct: His sincerity is doubted by me.
Exam Relevance
- Topic: Voice
- Subtopic: Active and Passive Voice

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