用于兩者之間的同級(jí)比較，表示"…和…一樣"：

　　① "as +原級(jí)形容詞+as"的結(jié)構(gòu)，表示前后兩者的情況一樣

　　"A+系動(dòng)詞+as+形容詞原級(jí)+as+ B，

　　eg. Bill is as funny as his father.

　　My handwriting is as beautiful as yours. 我的書(shū)法和你的一樣好。

　　"A+謂語(yǔ)動(dòng)詞+as+副詞原級(jí)+as+ B"

　　eg. Lucy speaks Chinese as well as Lily.

　　②    在否定句中，用"not as/ so +原級(jí)形容詞as"結(jié)構(gòu)，表示前者不如后者。

　　"A+系動(dòng)詞+not as／so+形容詞原級(jí)+as十B"

　　eg. These books aren't as interesting as those.

　　I am not as/ so busy as I used to be. 我沒(méi)有過(guò)去那么忙了。

　　"A+助動(dòng)詞／情態(tài)動(dòng)詞+not+謂語(yǔ)動(dòng)詞+as／so+ B"

　　eg. She didn't sing so well that night as she usually does.

　　③ 如若第一個(gè)as/ so后的形容詞作定語(yǔ)修飾名詞，應(yīng)將該名詞及有關(guān)修飾語(yǔ)都放在第一個(gè)as/ so之后。

　　We have produced as many tractors as we did last year.  我們生產(chǎn)的拖拉機(jī)和去年一樣多。

　　I don't make as/ so much money as you do. 我掙得錢(qián)不如你掙得多。

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