職稱(chēng)英語(yǔ)考試必備基礎(chǔ)語(yǔ)法點(diǎn)72

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　　(3)while、when、as的用法區(qū)別：while常表示一個(gè)較長(zhǎng)的動(dòng)作,它引導(dǎo)的從句動(dòng)作與主句的動(dòng)作是只能是同時(shí)發(fā)生的、是平行的;when可以表示較短的動(dòng)作也可以表示較長(zhǎng)的動(dòng)作,主句和從句的動(dòng)作可以同時(shí)發(fā)生也可以先后發(fā)生;as與上兩詞同義,可替換while和when, 表示主句和從句的動(dòng)作同時(shí)發(fā)生,常譯為“一邊……一邊……”。如：Please do not trouble me while I am writing my homework.(我寫(xiě)作業(yè)時(shí)請(qǐng)不要打擾我)/ I’ll go home when I have finished my job.(我干完了活兒就回去)(不是同時(shí)發(fā)生)/ They were running quickly across the road when they heard the sound of a truck coming.(他們正快速地穿過(guò)馬路忽然聽(tīng)到了卡車(chē)開(kāi)來(lái)的聲音)/ As we walked in the dark street, we sang songs and talked loudly.(當(dāng)我們?cè)诤诙炊吹慕稚献呗窌r(shí)我們高聲地唱歌說(shuō)話(huà))

　　(4)till/until與not…till/until的區(qū)別：前者表示一個(gè)延續(xù)性的動(dòng)作,后者表示一個(gè)才開(kāi)始的動(dòng)作。如：I will stay here and watch the baby until you return.(我會(huì)呆在這里看著娃娃直到你回來(lái))(stay這個(gè)動(dòng)作一直進(jìn)行到你return) / They won’t go on working until they get what they think is reasonable.(他們要到獲得了他們認(rèn)為合理的東西時(shí)才會(huì)繼續(xù)干下去的)

　　另外till與until基本可以互換,但是在句首時(shí)只能用until,不能用till. 如：Until the last minute of the match we kept playing.(我們堅(jiān)持到比賽的最后一分鐘)/ Not until he had finished his work did he go home.(直到做完工作他才回家)(倒裝句)