收藏!山東成人高考英語基礎(chǔ)句式講解之狀語從句

在英語中的狀語從句可以用來表示時(shí)間、地點(diǎn)、原因、目的、結(jié)果、條件、行為方式、比較關(guān)系、讓步等。這些狀語從句用來修飾主句中的謂語動(dòng)詞、形容詞、副詞或整個(gè)句子。

今天我們來學(xué)習(xí)時(shí)間狀語從句。

時(shí)間狀語從句通常用when,while,as,after,before,since,as soon as,until等連詞引導(dǎo)。
when,as,while引導(dǎo)的時(shí)間狀語從句

A.作"當(dāng)……時(shí)"講時(shí),when既可與短暫性動(dòng)詞連用,又可與延續(xù)性動(dòng)詞連用,as和while要和延續(xù)性動(dòng)詞連用。

①I'll tell him when he comes.他來的時(shí)候我會(huì)告訴他。(come是短暫性動(dòng)詞)②He fell asleep while he was reading a book.他在讀書的時(shí)候睡著了。(read是延續(xù)性動(dòng)作)

B.when引導(dǎo)的從句的謂語動(dòng)詞可與主句的謂語動(dòng)詞不同時(shí)發(fā)生,而as和while引導(dǎo)的從句的謂語動(dòng)詞必須和主句的謂語動(dòng)詞同時(shí)發(fā)生。當(dāng)主、從句動(dòng)作同時(shí)發(fā)生,且從句動(dòng)作為延續(xù)性動(dòng)詞時(shí),三者可以互換。

①When he had finished his homework,he took a rest.當(dāng)他完成作業(yè)時(shí),他休息了一下。(had finished 先發(fā)生)②When/While/As she was watching TV,I was reading a book.當(dāng)她看電視時(shí),我正在看書。

C.when有時(shí)用作等立連詞(并列連詞),意思是"這時(shí),突然";while作為連詞可以表示讓步關(guān)系,意為"雖然",也可表示轉(zhuǎn)折關(guān)系,意為"但是,可是";as則有時(shí)表伴隨關(guān)系,意為"一邊……一邊……"。

①I was about to go out when someone dropped in on me.我正打算出門,這時(shí)有人來拜訪我。②While l understand what you say,I can' t agree with you.雖然我理解你所說的,但我并不贊同你的觀點(diǎn)。③The students took notes as they listened.學(xué)生邊聽邊做筆記。

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