(3)while、when、as的用法區(qū)別：while常表示一個較長的動作,它引導(dǎo)的從句動作與主句的動作是只能是同時發(fā)生的、是平行的;when可以表示較短的動作也可以表示較長的動作,主句和從句的動作可以同時發(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作同時發(fā)生,常譯為“一邊……一邊……”。如：Please do not trouble me while I am writing my homework.(我寫作業(yè)時請不要打擾我)/ 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.(他們正快速地穿過馬路忽然聽到了卡車開來的聲音)/ As we walked in the dark street, we sang songs and talked loudly.(當(dāng)我們在黑洞洞的街上走路時我們高聲地唱歌說話)
(4)till/until與not…till/until的區(qū)別：前者表示一個延續(xù)性的動作,后者表示一個才開始的動作。如：I will stay here and watch the baby until you return.(我會呆在這里看著娃娃直到你回來)(stay這個動作一直進(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)為合理的東西時才會繼續(xù)干下去的)
另外till與until基本可以互換,但是在句首時只能用until,不能用till. 如：Until the last minute of the match we kept playing.(我們堅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)
(4)till/until與not…till/until的區(qū)別：前者表示一個延續(xù)性的動作,后者表示一個才開始的動作。如：I will stay here and watch the baby until you return.(我會呆在這里看著娃娃直到你回來)(stay這個動作一直進(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)為合理的東西時才會繼續(xù)干下去的)
另外till與until基本可以互換,但是在句首時只能用until,不能用till. 如：Until the last minute of the match we kept playing.(我們堅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)