Voice
Drafting a letter is a skill which can be acquired by you with a lot of practice.

You may acquired the skill of drafting a letter with a lot of practice.
Drafting a letter is a skill which you could acquire with a lot of practice.
Drafting a letter is a skill which you can acquire with a lot of practice.
Drafting a letter is a skill which you will acquire with a lot of practice.

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Voice
The telegraph wires have been cut.

Someone has been cut the telegraph wires.
Someone has cut the telegraph wires.
The telegraph wires have cut by someone.
Someone have cut the telegraph wires.

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Voice
He said to me, "What time do the offices close?"

He wanted to know what time the offices close.
He asked me what time the offices did close.
He asked me what time did the offices close.
He asked me what time the offices closed.

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