一、 下列结构含有ing:
1. keep doing
2. keep sb. doing
3. enjoy doing
4. finish doing
5. be afraid（害怕）of doing
6. be worth（值得）doing
7. be busy doing
8. how about doing//what about doing
9. spend some time (in)doing
10. spend some money on sth
11. feel like doing
12. thank you for doing
13. thanks for doing
14.do some cooking/cleaning/reading/shopping/washing
15. go swimming/fishing/shopping/skating/boating
16. mind/practise doing
17. can’t help doing
18. there is/are +n.+ doing …
二、 下列结构用不带to的动词不定式：
1. had better (not) do sth.
2. would you please (not) do sth.
3. why not do sth.
4. why don’t you do sth.
5. Shall we do sth.?
6. let do sth.
7. make sb. do sth.
三、 下列结构用带to的动词不定式：
1. It’s time to do sth.
2. It takes sb. some time to do sth.
3. tell/ask/want/encourage sb. to do sth.
4. Would you like to do sth.?
5. It’s good/bad to do sth.
6. It’s good/bad for sb.to do sth.