English Grammar - Active Voice and Passive Voice

English Grammar
English Grammar - Active Voice and Passive Voice

Convert the sentence provided below from its passive voice structure to an active voice structure: Rare minerals are known to have been secretly extracted from the site by unauthorized workers before the inspection.


Options:

  1. Unauthorized workers extracted the rare minerals before inspection.
  2. The site was secretly mined before the inspection.
  3. Unauthorized workers are known to have secretly extracted rare minerals before inspection.
  4. The minerals had been extracted prior to inspection.

Right Answer: Unauthorized workers are known to have secretly extracted rare minerals before inspection.

The original sentence is passive: 'Rare minerals are known to have been secretly extracted ... by unauthorized workers.' Converting it to the active voice requires the agent in the 'by' phrase to become the grammatical subject, while the reporting frame 'are known to' is preserved intact. Option three does exactly this, making 'unauthorized workers' the subject and retaining 'are known to have secretly extracted'. Option one drops the reporting frame and alters the tense. Option two remains passive and omits the agent entirely. Option four is likewise passive and loses the agent. Hence option three is correct.

This question is part of English Grammar - Active Voice and Passive Voice, which has 15 practice questions with answers.

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