Select the correct passive form of the given sentence.
"They ought to have completed the task."
Show answer & explanation
Correct answer: C
Explanation
Active to passive voice conversion:
Subject and Object Swap: In the active voice, "They" is the subject and "the task" is the object. In the passive voice, "The task" becomes the subject.
Verb Transformation: When a modal verb is used with a perfect infinitive (ought to + have + past participle), the passive structure requires adding "been" before the past participle. The formula is: Modal + have + been + Past Participle.
Maintaining the Modal: "Ought to" must remain intact. Other options like "The task ought have completed" are grammatically incorrect because they omit the necessary "to" or the passive marker "been."
Passive voice: The task ought to have been completed.