Out of the given options, choose the one which is the correct passive voice of the sentence given below. Who did this work?

The correct answer is, 'By whom was this work done?'

Key Points

• The sentence is in active form, hence we change it to passive form.
•  Certain actions are expressed in passive voice because,
  • ​When it is not sure by whom the action was performed.
  • The action is more important than the person by whom it was performed.
• In passive voice the past participle form of the verb along with the appropriate form of auxiliary is used.
• In case of an interrogative sentence the following format is followed.
  • Given auxiliary + object + to be + V₃ + by + subject.
  • The interrogative word 'Who' is changed to 'Whom'.
  • The subject and object of the sentence is identified and its places are exchanged.
  • The V₂ form of 'do' did is changed to its V₃ form 'done'.
• Hence, option 3 is the correct answer.

Therefore, the correct sentence is -'By whom was this work done?'