1. walking
2. to say
3. to buy
4. cooking
5. building
6. to go
7. playing
8. raining
9. Studying
10. hear
11. shouting
12. opening
13. to buy
14. to learn
15. entering
16. to pass
17. working
18. swimming
1. walking
2. to say
3. to buy
4. cooking
5. building
6. to go
7. playing
8. raining
9. Studying
10. hear
11. shouting
12. opening
13. to buy
14. to learn
15. entering
16. to pass
17. working
18. swimming