Объяснение:

1. She has worked as a nurse.

2. She has written three letters.

3. The Browns have visited us.

4. He has passed his exams.

5. I have just phoned him .

6. We have cleaned the room.

7. He has brushed his teeth.

8. My class has gone to London.

9. I have spent my holidays in France.

10. I have read the interesting book.

11. They have hepled their grandparents in the garden.

12. Tom and Jack have played football in the yard.