after class是什麼時態的標誌
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after幾種用法:
一、after作介詞的用法:
r+名詞,作為介賓短語,
如:after 5 o'clock。五點以後。
He ran after the bus.他在那輛公交車後追着跑。
r+動名詞,也是作為介賓短語,
如:after having finished my homework。完成我的作業後。
I will go to bed after drinking the milk.
r+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三小時後; He told me after that he had not enjoyed the film.他告訴我後來他一點都不想看電影。
三、after做連詞的用法:
如:I saw them after I arrived.我到了之後才看到他們。
用作連詞引導時間狀語從句時注意:若主句用將來時態(或含有將來意味),則時間狀語從句要用一般現在時態 (表將來意義)表將來意義,而不能直接使用將來時態:他回來後我就走。正:I’ll leave after he comes back.誤:I’ll leave after he will come back.
after前後時態
1、遵循“主將從現”原則。
如:He will go to Beijing to work after he graduates from the university.
2、從句表示的`動作發生在主句動作之前,如果強調從句的動作發生在前,從句謂語要用過去完成時,主句用一般過去時。
如:He went out for a walk after he had finished the work.
他完成這項工作後他出去散步。
3、從句表示的動作發生在主句動作之前,如不強調動作的先後,主句和從句均用一般過去時。
如:He went to bed after he finished his homework last night.
昨晚他完成作業後上牀睡覺。
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