Voice
He was congratulated by his teacher on his brilliant success in the recent examination.

He congratulated his teacher on his brilliant success in the examination.
His teacher congratulated him for his brilliant success in the recent examination.
His teacher congratulated him on his brilliant success in the examination.
His teacher congratulated him.

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Voice
His friends accused him of theft.

He is being accused of theft by his friends.
He had been accused of theft by his friends.
He was accused of theft by his friends.
He can be accused of theft by his friends.

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Voice
The teacher punished the boys who had not done their homework.

The boys who had not done their homework were punished by the teacher.
The boys who had not done their homework were being punished by the teacher.
The boys who had not done their homework had been punished by their teacher.
The boys were punished by their teacher who had not done their homework.

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