10. He used to play tennis when he was young
11. She used to swim when she was young
12.They used to go swimming last summer
13. There used to be a big tree there when I was a child
14. Mary is a slow worker
15. He is a hard student
16. They are fast swimmer
17. He is a good student
18. He is interested in playing soccer on Sundays
19. She enjoys listening to classical music before sleeping
