Помогите сделать задание по английскому

Ответ:

1. Have you finished welding?

2. We have done the grinding.

3. Have you and Ahmed painted it?

4. We haven't painted it.

5. They built the base.

6. They haven't finished base.

7. Have they checked the inside?

8. Simon has checked inside.

9. They haven't repaired the valve.