19.
1. B: I'm going
2. A: Is Ann talking; B: is doing
3. A: How often do you go swimming?
4. A: are studying; B: want
5. A: are going; B: are you going
6. A: does it take
20.
1. am writing
2. am
3. are having
4. am lying
5. is playing
6. is watching
7. is swimming
8. get up
9. spend
10. are going
11. are taking
12. want