Voice
I shall write a letter.

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

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Voice
They have published all the details of the invention.

All the details of the invention have been published by them.
All the inventions have been detailed by them.
The publication of the details of invention was done by them.
All the details have been invented by the publishers.

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Voice
We must take care of all living species on earth.

All living species on earth will be taken care of by us.
All living species on earth must taken care of by us.
All living species on earth must be taken care of by us.
All living species on Earth had been taken care of by us.

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