1 I have been working in the garden for two hours.
2 My parents have been married for twelve years
3 Ann has been learning English since her childhood.
4 He hasn't been running for two hours.
5 I have been looking for my gloves for half an hour
6 Have they been swimming since 5 o' clock?
7 How long has Nick fixing his car?
8 Sam hasn't been cleaning his room since last Saturday.
9 How long have you been studying in this school?
10 I have been writing this exercise for two hours.
