A. aux. v.
(1) 帮助构成一般过去时或一般现在时的疑问或否定式
   They do not believe it.   When id they arrive there?
 (2) 用在肯定句和祈使句中加强语气
   I do miss you, Mum.   She does sing well.
   Do be on time.   So she did come after all.
 (3) 用来表示前边提到的动作（以免重复）
 ---May I come round in the evening?  ---Yes, please do.
   I knew he would help us, and he did.
 (4) 用于某些倒装句中
   Only then did I realize he had been wrong.
   Never did he know anything about it.
B. 做 vt. Can I do anything for you?
 We often do our homework together.
 The glass is broken. who did it?
 We did some reading last night.
 She did most of the talking.
C. vi.   (1) 表示生活、学习等情况How do you do?
They did very well in English but badly in maths.
How did you do in the exam?  How are you doing?
(2) 行了、够了、可以On e piece of bread will do.
Talking with your mouth full won’t do.
(3) 做、办  Do as you are told to.
When in Rome, do as the Romans do.
Let her do as she likes.
D.习语
do…with…处理     What have you done with my bike?
can do with…将就用  I can do with the old bed.
do something about…对…采取措施
do sb. a favor=do a favor for sb.帮某人个忙
do away with…废除、破除、去掉
do sb. good/harm/wrong= do good/harm/wrong to sb. 对某人有益/有害/冤枉某人
do one’s best/ bit/part=do everything/all/what one can尽力
do …up包扎、扣（纽扣）
do without…没有…也行、不需要
have something to do with…与…有关
do right/wrong做得对/做错了