1. are, am looking
2. broke
3. is, has just gone, left
4 did she return, returned
5.are you reading, am reading,have you read
6.do you remember, have met
7.have they discussed, discussed
8.did mother put, am looking for it
9. are you waiting for, are waiting, went
10. have not had, left
11.have your children read, read
12. is, have gone