2024年職稱英語考試基礎(chǔ)語法綜合復(fù)習(xí)

　　while、when、as的用法區(qū)別：while常表示一個(gè)較長的動(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./ Ill go home when I have finished my job./ They were running quickly across the road when they heard the sound of a truck coming./ As we walked in the dark street, we sang songs and talked loudly.

　　till/until與nottill/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)才開始的動(dòng)作。如：I will stay here and watch the baby until you return. / They wont go on working until they get what they think is reasonable.

　　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./ Not until he had finished his work did he go home.