1. I finished this letter yesterday.
2. They are busy with their homework.
3. He likes palying basketball.
4. Thank you for your help.
5. Don't keep your friends wait too long.
6. Tom is good at reading English.
7. How about going to the park?
8. I have to ask him to get rid of smoking.
9. I don't feel like eating anything.
10. They walked on.
11. he spent three years learning English.
12. The teacher prevented the girl from singing in the maths class.
13. Tom thinks about helping his friend learn English.