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2024年职称英语考试基础语法综合复习

雕龙文库

【简介】感谢网友“雕龙文库”参与投稿,这里小编给大家分享一些,方便大家学习。

  while、when、as的用法区别:while常表示一个较长的动作,它引导的从句动作与主句的动作是只能是同时发生的、是平行的;when可以表示较短的动作也可以表示较长的动作,主句和从句的动作可以同时发生也可以先后发生;as与上两词同义,可替换while和when, 表示主句和从句的动作同时发生,常译为一边一边。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与nottill/until的区别:前者表示一个延续性的动作,后者表示一个才开始的动作。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与until基本可以互换,但是在句首时只能用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.

  

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