Voice
Every dish which had been cooked by my mother was appreciated by the guests.

The guests appreciated every dish which was cooked.
The guests appreciated every dish which my mother had cooked.
My mother had cooked every dish which the guests appreciated.
The guests appreciated every dish which had been cooked by my mother.

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Voice
Pinki said to Gaurav, "Will you help me in my work just now?"

Pinki told Gaurav whether he will help her in her work just now.
Pinki asked Gaurav if he would help her in her work just then.
Pinki asked to Gaurav that will he help her in her work just now.
Pinki questioned to Gaurav that will you help me in my work just now.

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Voice
He teaches us grammar.

We were teached grammar by him.
Grammar was taught to us by him.
We are taught grammar by him.
Grammar will be taught to us by him.

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Voice
The manager could not accept the union leader's proposals.

The union leader's proposals could not be accepted by the manager.
The union leader's proposals will not be accepted by the manager.
The union leader's proposals would not be accepted by the manager.
The union leader's proposals were not accepted by the manager.

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