Transformation:

1. (most) favourite subject is Physics.

2. favourite activity (of ours) at recess.

3. your favourite activity?

4. Tom's favourite sport.

5. soccer are the most well-known sports in Vietnam.

6. sent him a letter.

7.  best friend gave her a gift.

8. a letter from my parents every week.

9. gave them two movie tickets.

10. a packet of chocolate from Tom.

11. interested in/fond of/... learning Maths and English.

12. like watching cartoons.

13. very/ highly/... interested in Literature.

14. walking in the rain.

15. John like/enjoy... playing soccer?

16. cost 10.000 dong.

17. this face mask cost?

18. these rackets cost?

19. ten thousand for this hamburger.

20. is the price of this calculator?

21. able to play table tennis well./ good at playing table tennis.

22. speaks French well.

23. good at cooking./ a good cook.

24. a bad swimmer/ not good at swimming.

25. talented at dancing.

26. part in our school's English club.

27. participate in next week's wedding.

28. in that competition along with others.

29. part in his birthday party tomorrow.

30. now a contestant of an eloquence competition.