AUXILIARY VERBS IN PAST TENSE
At the time of changing active voice into passive voice, subject and object are interchanged. Auxiliary verbs ‘might have’, ‘could have’, ‘should have’, ‘would have’, ‘must have’ are respectively replaced with ‘might have been’, ‘could have been’, ‘should have been’, ‘would have been’, ‘must have been’. Using 3rd form of verb, subject follows ‘by’.
1. Affirmative:
Active voice : Subject + Auxiliary verbs + have + 3rd form of Verb + object. Passive voice: Object + Auxiliary verbs+ have+been +3rd form of verb +by + Subject. |
a. Active voice : They might have done it.
Passive voice : It might have been done by them.
b. Active voice : She should have taken a rich diet.
Passive voice : A rich diet should have been taken by her.
2. Negative:
Active voice : Subject + Auxiliary verbs + not + have + 3rd form of Verb + object. Passive voice: Object+Auxiliary verbs+not+have+been+3rd form of verb+by+Subject. |
a. Active voice : You would not have lost anything.
Passive voice : Anything would not have been lost by you.
b. Active voice : She could not have saved me from loss.
Passive voice : I could not have been saved by her from loss.
3. Interrogative:
Active voice : Auxiliary verbs + subject + have + 3rd form of Verb + object? Passive voice: Auxiliary verbs+object +have+been+3rd form of verb+by+Subject? |
a. Active voice : Must people have killed the mad dog?
Passive voice : Must the mad dog have been killed by people?
b. Active voice : Could our team have won the match?
Passive voice : Could the match have been won by our team?
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