III. Đổi các câu sang phủ định và nghi vấn:
14. She will go to the library this afternoon.
15. They are playing volleyball in the school yard.
16. Nam watches TV every night.
17. My father is reading a newspaper now.
18. The students often go to the canteen at break.
19. They will visit their grandparents next Sunday.
20. I have English on Monday, Tuesday and Friday.