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"實義，助動詞，替前文，強(qiáng)語氣。

　　作用一：實義do

　　do作實義動詞時，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：

　　①The 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?

　　③Well done!

　?、躎hat 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.

　　②Kate stayed at home last night, didn't she?

　?、跦ow many books does the library have?

　　④She 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：

　　①Do be careful.

　?、贒on't tell a lie.

　　③He did come.

　?、?You often go to the park.

　　-So we do.