Part 1

1 : She has been in Vung Tau since January.

2 : Ha and Nam have seen this film since 7 o’clock.

3 : I have sent her 3 letters since last week.

4 : My sister has worked at that hospital for 5 years.

5 : I have known her since we were at elementary school.

6 : Nam has become a footballer for 3 years.

7 : She’s been in London since Monday.

8 : Mike has lived in Hanoi for four years.

9 :  I have written to her since Christmas.

10 : We’ve not seen her since last month.

Cách dùng : 

Since + mốc thời gian ( sunday , monday ,.... )

For + khoảng thời gian ( 10 years , 6 months,.... )