1 where are you going now ? i am going to the thearter 

-> thì HTTD 

-> có chữ now nhận bt 

-> s + be + v-ing 

2 doesn't do

-> regularly. : thường xuyên -> dấu hịu nhận bt của thì HTĐ 

3 is he doing morning excirses now

-> thì HTTD 

-> có chữ now nhận bt 

-> s + be + v-ing 

4 boils

-> thì HTĐ , diễn tả sự thật 

6 is going to meet 

-> next week là dấu hịu nhận bt của thì TLG 

-> s + be + going to + V Nguyên mẫu 

7 are you a student ? 

-> sao có food đc nhỉ ? 

-> thì HTĐ 

8 don't go 

-> có trạng từ chỉ tần suất usually nhận bt 

-> thì HTĐ 

9 is swimming 

-> thì HTTD 

-> có chữ now nhận bt 

-> s + be + v-ing 

10 is going to come

-> next month là dấu hịu nhận bt của thì TLG 

11 aren't 

-> thì HTĐ

11. Where are you going now?- I am going to the theater. ( HTTD )

12. He does not do morning exersices regularly. ( HTĐ )

13. He is doing morning exersices now? ( HTTD )

14. Water boil at 100 degree centigrades. ( HTĐ )

15 . He will meet the dentist next week. ( TLĐ )

16. Are you a food student? ( HTTD )

17. They usually do not go to school by motorbike.( HTĐ )

18. He is swimming over there now. ( HTTD )

19. She will come here next month. ( TLĐ )

20. They aren't  doctors. ( HTTD )