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Which sentence is in the passive voice?

The song has sung by them.

They sing a song at the concert.

A song is sung by them at the concert.

They will sing a song at the concert.

Choose the correct passive voice form of 'She writes a letter'.

A letter has written by her.

A letter is written by her.

A letter was written by her.

A letter is being written by her.

Choose the correct passive voice form of 'The workers are building the house.' :

The house is being built by the workers.

The house is built by the workers.

The house is being built by the workers now.

The house is built by the workers.

Which sentence is correct in the passive voice?

The book has read by me last week.

The book was read by me last week.

The book read by me last week.

The book is being read by me last week.

What is the passive voice form of 'She has written a letter'?

A letter was written by her.

A letter has been written by her.

A letter is written by her.

A letter is being written by her.