1. I usually (go) to school.

2. They (visit) us often.

3. You (play) basketball once a week.

4. Tom (work) every day.

5. He always (tell) us funny stories.

6. She never (help) me with that!

7. Martha and Kevin (swim) twice a week.

8. In this club people usually (dance) a lot.

9. Linda (take care) of her sister.

10. John rarely (leave) the country.

11. We (live) in the city most of the year.

12. Lorie (travel) to Paris every Sunday.

13. I (bake) cookies twice a month.

14. You always (teach) me new things.

15. She (help) the kids of the neighborhood.

I.Chia động từ trong ngoặc ở thì hiện tại đơn : 

1.go 2.visit 3.play 4. works 5. tells 6. helps 7.swim 8.dance 9.takes care 10. leaves 11. live 12.travels 

13.bake 14.teach 15. helps 16.fly 17.are 18. has 19. doesn't 20.does / work 

Công thức thì HTĐ : 

1.Tobe : S + is/am/are +...... 

2.Động từ thường : 

I/we/you/they /danh từ số nhiều +V-inf , He/she/it/danh từ số ít +V(s/es) 

S + don't/doesn't +V-inf ( don't thuộc I/we/you/they , doesn't thuộ he/she/it ) 

Do/does + S +V-inf ? 

3.Dấu hiệu nhận biết : always , rarely , never , once /twice a week , every day/month/year/.... , often , sometimes , usually , ... 

@Chaeyoung