Select the option that expresses the given sentence in active voice: 'Trigonometry has been taught by him for donkey’s years.'

Question

Accepted Answer

The given sentence is in passive voice: 'Trigonometry has been taught by him for donkey’s years.' To convert it into active voice, the subject 'he' should perform the action. The tense is present perfect continuous passive, so the active voice equivalent is 'He has been teaching trigonometry for donkey’s years.' Option 4 correctly reflects this transformation. Option 1 is past perfect continuous, which changes the tense. Option 2 is grammatically incorrect. Option 3 is present continuous, which changes the tense and meaning.

Answer

Answer

Answer