Question : Select the option that expresses the given sentence in passive voice.
She might have completed her research by that time.
Option 1: Her research might be completed by her by that time.
Option 2: Her research might had been completed by her by that time.
Option 3: Her research might have been completed by her by that time.
Option 4: Her research might have completed by her by that time.
Correct Answer: Her research might have been completed by her by that time.
Solution : The correct choice is the third option .
Passive voice is the voice in which the object experiences an action rather than the person who performs the action. Hence, the object in the active sentence becomes the subject in the passive voice.
The structure of the passive voice sentence is, " Object + modal verb + have + been + past participle of the verb + by + agent of the action".
Therefore, the sentence in passive voice is: Her research might have been completed by her by that time.
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