1.i am going to visit my home village and my parents this summer holiday

2.my friend,Ba has phoned me six times this week

3.Hoa hasn't written to her pen pal for three years

4.Lan suddenly felt ill while she was doing the examination

5.Father enjoys reading newspapers after dinner

6.it is very necessary to learn English nowadays

7.we has studied English for five years

8.they was watching T.V when i came last night

9.yesterday i could not go to work because i was sick

10.we haven't seen each other since we left school

11.sister has worn new Ao dai only twice since she bought

12.when my father came back home yesterday we was watching TV

13.it is very kind of you to help us yesterday

14.the last time i saw Nam was 10 years ago