Voice
I shall write a letter.

A letter is writing by me.
A letter has been written by me.
A letter has written to me.
A letter will be written by me.

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Voice
The watchman switched on the lights before it began to grow dark.

The lights were being switched on by the watchman before it began to grow dark.
The lights were switched on by the watchman before it began to grow dark.
The lights were only switched on before it began to grow dark.
The lights are being switched on before it began to grow dark.

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