Question

Passive voice
They built a new theatre in our district.
You must return the books to the library on Monday.
They were reconstructing the old bridge then.
At the English lesson they repeat every sentence after the teacher.
Last Sunday he invited us to a concert.
Her friend sent nice flowers to her.
The teacher corrects every mistake.
She has sent the parcels today.
They usually leave their baby with us when they go out.
We had already packed our things for the journey by the time he came.

Answer 1

A new theatre was built in our district.

The books must be returned to the library on Monday.

The old bridge was being reconstructed then.

At the English lesson, every sentence is repeated after the teacher by them.

Last Sunday we were invited by him to a concert.

Nice flowers were sent to her by her friend. или She was sent nice flowers by her friend.

Every mistake is corrected by the teacher.

The parcels have been sent by her today.

Their baby is usually left with us when they go out.

Our things for the journey had already been packed by the time he came.