Active-to-passive voice transformation (present perfect) Original sentence: They have built a perfect dam across the river. Choose the correctly formed passive-voice sentence preserving tense and complements.
Verbal Ability
Change of Voice
Difficulty: Easy
Choose an option
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AAcross the river a perfect dam was built.
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BA perfect dam has been built by them across the river.
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CA perfect dam should have been built by them.
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DAcross the river was a perfect dam.
Answer
Correct Answer: A perfect dam has been built by them across the river.
Explanation
Concept/ApproachPresent perfect passive: "has/have been + past participle". Keep the place complement "across the river".
Option analysisCorrect: "A perfect dam has been built by them across the river."(a) Changes tense to simple past and distorts word order.(c) Modal "should have been" alters meaning (obligation/expectation).(d) Copular description, not a passive transformation of the action.
Final AnswerA perfect dam has been built by them across the river.