1. had been chopping
2. had been crying
3. had been eating
4. had been running
5. had been sunbathing
6. hadn't been sleeping
7. had he been looking
8. had been trying
9. had been doing
10. had Sandra been reading
3. 1. had taken
2. had been waiting
3. hadn't realized
4. had already bought
5. had the baby stopped crying
6. had you been standing
7. had already practiced
4.
1. since
2. how long
3. for, until
4. before
5. how long, before
6. until
7. since
8. for, until
