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They have published her new book recently.
2 The town council has just opened our local museum.
3 Their house looks very neat after they have painted it.
4 The room looks nice. Somebody has cleaned it.
5 My dress is clean. Someone has washed it.
6 Dinner is ready and hot. Someone has just cooked it.
7 They have opened a new theatre in the city.
8 There are no letters on the table. Somebody has posted them.

1 - They have published her new book recently.

The new book has been published recently by them.

2 - The town council has just opened our local museum.

Our local museum has just been opened by the town council.

3 - Their house looks very neat after they have painted it.

Their house has been painted by them.

4 - The room looks nice. Somebody has cleaned it.

The room has been cleaned by somebody.

5 - My dress is clean. Someone has washed it.

My drees has been washed by someone.

6 - Dinner is ready and hot. Someone has just cooked it.

The dinner has just been cooked by someone.

7 - They have opened a new theatre in the city.

A new theatre has been opened in the city by them.

8 - There are no letters on the table. Somebody has posted them.

The letters have been posted by somebody.