Просто напиши всё что в скобках это не правильные их меняешь на вторую форму а те которые правильные просто добавь окончание +ed

Ответ:

1. Elizabeth has begun to work at the pub.

2. Tania and John have just come with Anne.

3. We have visited the Museum in London.

4. Hector has already sold his old car.

5. My son has learnt to play the guitar.

6. You haven't met my boyfriend yet.

7. Tania has sent me a few messages today.

8. I have understood these instructions.

9. The traffic has been terrible today on the roads.

10. The President has opened the new hospital.

11. Yolanda has bought some presents for her sons.

12. Have you seen the last American film?

13. Martha has written a nice poem at school.

14. A gardener has kept my garden beautifully.

15. I have switched on all the lights in the house.

16. My cousins has flown to New York this morning.

17. Leonor has finished her homework yet.

18. Charles and you have won the competition.

19. You haven't tasted my new recipe.

20. Daniela has felt badle today. She is ill.