第1个回答 2012-08-29
1. 先分清楚这个两个词的意思
do一般是助动词,be就是be动词了。一般在主系表中的结构出现,或者在进行时里面出现
2. do的用法:
构成一般疑问句, do you want to have something to eat?
do + not 构成否定句, i dno't want to get up.
构成否定祈使句, don't be afraid!
放在动词原形前,加强该动词的语气, i do miss you.
用作代动词, would you marry me? yes, i do.
3. be动词用法
现在进行时:be+动词ing, i am doing homework now.
主系表结构表示主语的状态,性质: i am a boy. It's red.
还有,这个跟what没关系的
what do you do?(你是干什么的)
what are you doing?(你在干嘛)这时就是问状态了,现在进行时
PS: 手打辛苦,望采纳