after幾種用法：

　　一、after作介詞的用法：

　　1.after+名詞，作為介賓短語，

　　如：after 5 o'clock。五點(diǎn)以后。

　　He ran after the bus.他在那輛公交車后追著跑。

　　2.after+動(dòng)名詞，也是作為介賓短語，

　　如：after having finished my homework。完成我的作業(yè)后。

　　I will go to bed after drinking the milk.

　　3.after+代詞，作為賓語的主語，

　　如：He went home after he finished all the work

　　二、after做副詞的用法：

　　如：three hours after三小時(shí)后; He told me after that he had not enjoyed the film.他告訴我后來他一點(diǎn)都不想看電影。

　　三、after做連詞的用法：

　　如：I saw them after I arrived.我到了之后才看到他們。

　　用作連詞引導(dǎo)時(shí)間狀語從句時(shí)注意：若主句用將來時(shí)態(tài)(或含有將來意味)，則時(shí)間狀語從句要用一般現(xiàn)在時(shí)態(tài) (表將來意義)表將來意義，而不能直接使用將來時(shí)態(tài)：他回來后我就走。正：I’ll leave after he comes back.誤：I’ll leave after he will come back.

　　after前后時(shí)態(tài)

　　1、遵循“主將從現(xiàn)”原則。

　　如：He will go to Beijing to work after he graduates from the university.

　　他大學(xué)畢業(yè)后將去北京工作。

　　2、從句表示的`動(dòng)作發(fā)生在主句動(dòng)作之前，如果強(qiáng)調(diào)從句的動(dòng)作發(fā)生在前，從句謂語要用過去完成時(shí)，主句用一般過去時(shí)。

　　如：He went out for a walk after he had finished the work.

　　他完成這項(xiàng)工作后他出去散步。

　　3、從句表示的動(dòng)作發(fā)生在主句動(dòng)作之前，如不強(qiáng)調(diào)動(dòng)作的先后，主句和從句均用一般過去時(shí)。

　　如：He went to bed after he finished his homework last night.

　　昨晚他完成作業(yè)后上床睡覺。