4)
1. You've been talking
2. I've worked hard.
3. Have you posted
4. have been taking
5. Have you seen
6. haven't gone
7. used
8. hasn't caught
9. had the kids been watching
5) 1. stayed
2. were
3. decided
4. was going
5. heard
6. ran
7. came
6)
1. didn't use to
2. used to
3. used to
4. didn't use to
