1.The last time nam phoned chau was 5 years 

2.Linh hasn't written to vu before

3.dat hasn't seen nhi for 3 days

4.it's the first time we have watched this film

5.the last time he helped her was 5 months

6.how long have you learned english

7.i haven't written a letter to my aunt since may

8.nga has learned since last year

9.i haven't seen her since 2000

1.The last time Nam phoned Chau was 5 years ago. 

2.Linh hasn't written to Vu before 

3.Dat hasn't seen Nhi for 3 days.

4.It's the first time we have watched this film. 

5.The last time he helped her was 5 months ago. 

6.How long have you learnt E? 

7.I haven't wrote a letter to my aunt since May. 

8.Nga has learnt French since last year. 

9.I haven't seen her since 2000.