1) where have you been? i have gone to the doctor.
2) have you seen my glasses anywhere?
3) They have just gone out
4) i have lost my passport
5) we have bought a new sofa
6) the film has just begun
7) have you ever ridden a bicycle?
8) many people have never flat a plane
9)how long have you known
10) i haven't bought
1) since
2)for
3) since
4) for
5) since
6) for
7) for
8) since
9) since