Voice
The packet has not been opened by anyone.

No one has been opening the packet.
No one has not opened the packet.
No one has opened the packet.
Anyone has not opened the packet.

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Voice
His comment hurt me deeply.

I could be hurt deeply by his comment.
I should not be hurt by his comment.
I was hurt deeply by his comment.
His comment was hurtful.

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Voice
They have built a perfect dam across the river.

A perfect dam should have been built by them.
A perfect dam has been built by them across the river.
Across the river a perfect dam was built.
Across the river was a perfect dam.

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Voice
He teaches us grammar.

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

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