Rewrite the sentences in the passive form:

1. We are weighing the pieces of metal.
2. People must prepare the plates properly.
3. They repair the bows.
4. The boys will paint the roof of the house.
5. They usualy built ships of wood in the past.

1. The pieces of metal are being weighed.

2. The plates must be properly prepared.

3. The bows are repaired.

4. The roof of the house will be painted by the boys.

5.  In the past, ships were usualy built of wood.