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What are the different active and passive forms of past tense?

Past Simple Tense 
Auxiliary verb in passive voice: was/were

Active voice:
I killed a snake
I did not kill a snake.
Did I kill a snake?

Passive voice:
A snake was killed by me.
A snake was not killed by me.
Was a snake killed by me?


Past Continuous Tense 
Auxiliary verb in passive voice: was being/were being

Active voice:
He was driving a car.
He was not driving a car.
Was he driving a car?

Passive voice:
A car was being driven by him.
A car was not being driven by him.
Was a car being driven by him?


Past Perfect Tense 
Auxiliary verb in passive voice: had been

Active voice:
They had completed the assignment.
They had not completed the assignment.
Had they completed the assignment?

Passive voice:
The assignment had been completed by them.
The assignment had not been complete by them.
Had the assignment been completed by them?



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