1.
Verbs we can use in the continuous: run, sing, buy, climb, work.
Verbs we don't normally use in the continuous: need, believe, understand, own, hate, like, want, know, feel.
2.
1. know
2. 's learning
3. need
4. do you think
5. aren't playing
6. don't understand
7. Can you hear
3.
1. don't understand
2. think
3. What are you doing right now?
4. don't want
5. belongs
6. feel
7. don't like