Zad 3
1. to come
2. buying
3. trying
4. tell
5. to learn how
6. surfing
7. to go
8. to buy
9. listening
10. to help
Zad 4
1. must
2. had to
3. don't need to
4. mustn't
5. wasn't able to
6. shouldn't
7. could
8. can
9. was able to
10. might
