1 haven't seen ( thì hiện tại hoàn thành ,dấu hiệu since)

2 has been ( thì hiện tại hoàn thành , dấu hiệu for)

3 went (thì quá khứ đơn , dấu hiện last night)

4 moved ( thì quá khứ đơn , dấu hiệu in2003) in + năm là dấu hiệu của thì quá khứ đơn á bạn

5 have lived (thì htht , dấu hiệu since January) htht là hiện tại hoàn thành 

6 has had ( thì htht, dấu hiệu for a long time)

7 bought (quá khứ đơn , dấu hiệu ago)

8 has been ( thì htht , dấu hiệu fora week )

9 visits ( ht đơn , dấu hiệu once a week)

10 do - do ( ht đơn , dấu hiệu hỏi về dự định)

11 play ( htđ , dấu hiệu often )

12 work (htđ , dấu hiệu seven days a week )

13 came ( qkđ , ago) 

14 have just sent ( htht , just)

15 has work (htht , for)

phần 2 

1 doesn't drink - drinks

2 is

3 do you do

4 circles

5 see

6 don't eat

7 make

8 doesn't grow

phần 3 

1 will cause  

2 will see

3 wrote 

chúc bạn học tốt

Ex1:

1. haven't seen

2. has been

3. went

4. moved

5. have lived

6. has had

7. bought

8. has been

9. visits

10. do - do

11. play

12. work

13. came

14. have just sent

15. has worked

Ex2:

1. doesn't drink - drinks

2. is

3. do you do

4. circles

5. see

6. don't eat

7. make

8. isn't grown

Ex3:

1. causes

2. will see

3. wrote