21. They have played tennis since 2003 (chuyển từ QKĐ sang HTHT)

22. He wishes he could sing very well (câu ước lùi thì và đổi từ khẳng định sang phủ định và ngược lại)

23. It is said that he invented the digital camera (câu bị động khách quan)

24. Nga asked Nam if he lived in a big city (câu trực tiếp sang câu gián tiếp với asked lùi thì và có if hoặc whether)

25. My mother suggested planting some green trees around the garden (suggest+V-ing)

26. I wish I could speak English fluently (câu ước lùi thì)

27. Nga has lived in Ha Noi for 5 years. (t nghĩ chia ở HTHT)

   có câu sai thì thông cảm ạ :D

21. They have started playing tennis in 2003.

CT: S + have/has + V chia htht.

22. He wishes he could sing very well.

 CT: S + wish/wishes + could/would + V để nguyên.

23. It is said that he invented the digital camera.

 CT:

+ ) Active (chủ động) : People (they) + say (said) + that + MĐ

+ ) Passive (bị động) : It + is / was + said + that + MĐ.

24. Nga asked Nam if he live in a big city?

 CT: S + asked smb if/wether + S(đổi ngôi) + V(lùi thì).

25. My mother suggested planting some green trees around the garden.

 CT: suggest + V-ing ( gợi ý làm gì ) 

VII. Use the suggested words to write meaningful sentences.

26. I wish I could speak English fluently.

 CT: S + wish + S + V(qkđ)

27. Nga has lived in Ha Noi for 5 years.

 CT: HTHT : S + has/have + V(chia htht) + ... +(giới từ) thời gian.