1.How long have you worked at the city hall? ( eight years )
- I've worked at the city hall for eight years

2.How long have you liked him? ( High school )
- I've you liked him since High school

3.How long has she been sad? ( her friend left )
- she's been sad since her friend left

4.How long has James studied French? ( several months)
- He's studied French for several months

5.How long have you known Mr. Benson? ( college)
- I've knew him since college

6.How long have you shared room with her? ( a few months )
- I've shared room with her for a few months

7.How long has she hated him? ( last winter )
- She's hated him since last winter

8.How long have they travelled around Europe? ( a few weeks )
- they've travelled around Europe for a few weeks

9.How long have the clients stayed for the seminar? ( yesterday )
- They've stayed for the seminar since yesterday

10.How long has he exercised? ( a couple of weeks )
- He's exercised for a couple of weeks