初中英語語法:Do 的四作用

　　Do 的四作用

　　動詞do在句中的作用可以概述為四句十二字："做"實(shí)義，助動詞，替前文，強(qiáng)語氣。

　　作用一：實(shí)義do

　　do作實(shí)義動詞時，有do, does, did, done, doing五種形式，還有及物、不及物之分。如：

　　1. vt. "做;研究;整理;完成"。如：

　?、賂he old man does an hour of sport every day.

　?、赟he did her homework at home last night.

　?、跰other was doing the cooking when I reached home.

　　④Have you done the exercises yet?

　　2. vi. "行動;工作;進(jìn)展;足夠"。如：

　　①Kate does very well in her Chinese.

　?、贖ow do you do?

　?、踂ell done!

　　④That will do.

　　作用二：助動do

　　do作助動詞時，只有do, does, did三種形式，無詞義，限用于含行為動詞的一般現(xiàn)在時和一般過去時兩種時態(tài)的否定句和疑問句中。如：

　　①They don't have any tickets for tonight's concert.

　?、贙ate stayed at home last night, didn't she?

　?、跦ow many books does the library have?

　?、躍he doesn't do the washing in the evening.

　　作用三：替代do

　　為避免動詞的重復(fù)，使語言簡練，常以do, does, did替代前文所用的行為動詞。如：

　?、賂om runs much faster than you do.

　?、?Lucy, can you get some more tea, please?

　　-Sure. I'll do it right away.

　　②-Who broke the cup?

　　-Mimi did.

　?、?I like bananas.

　　-So does he.

　　作用四：語氣do

　　為突出感情色彩，do常用于祈使句、強(qiáng)調(diào)句和倒裝句中，以加強(qiáng)語氣。如：

　?、貲o be careful.

　?、贒on't tell a lie.

　?、跦e did come.

　?、?You often go to the park.

　　-So we do.