The search proved difficult . takes the 'search' as the active subject of the sentence and is correct. The search was proved difficult .
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Gilbert HardingThe search proved difficult. takes the 'search' as the active subject of the sentence and is correct.Wouldn't the passive be "was pr
The search was proved difficult. uses the passive tense to imply that someone, unmentioned in the sentence, did the action i.e. the proving.
hope this helps
GH