1) 1. snows
2. is snowing
3. cooks
4. is cooking
5. leaves
6. is leaving
7. watch
8. are sitting
9. does
10. is doing
11. rains
12. is raining
13. has
14. is having
2) 1. goes (Present Simple, обычное, регулярно происходящее действие; в 3-ем лице ед.ч. глагол принимает окончание -s).
2. are watching (Present Continuous, действие происходит в момент речи, образуется при помощи вспомогательного глагола to be, в данном случае имеющим форму are, и окончания -ing смыслового глагола).
3. writes (Present Simple, обычное, регулярно происходящее действие, "каждую неделю")
4. drives (Present Simple, обычное, регулярно происходящее действие, "обычно")
5. is sitting (Present Continuous, действие происходит в момент речи, "сейчас")
6. is ringing (Present Continuous, действие происходит в момент речи)
7. studies (Present Simple, регулярно происходящее действие, "каждый год")
8. spend (Present Simple, регулярно происходящее действие, "всегда")
9. go (Present Simple, регулярно происходящее действие, "обычно")
10. reading (Present Continuous, действие происходит в момент речи)
3) 1. aren't
2. don't
3. isn't
4. don't
5. doesn't
6. isn't
7. doesn't
8. don't
9. don't
10. doesn't
4) 1. Do
2. Are
3. Does
4. Is
5. Do
6. Are
5) 1. We are not going to school today.
2. What are you doing after school?
3. At the moment Peter is working in Russia.
4. Does he get a new car?
5. He never wears a hat.
6. He doesn't like black koffee.
7. We are having a good time.
8. What are you doing now?
9. It is raining at the moment.
10. How do you like the game?