when,while,as引导时间状语从句的区别.ppt

1、When，while，as引导时间状语子句的差异，when，while，as显然可以引导时间状语子句，但使用差异很大。首先，when可以和连续性动词一起使用，也可以和临时动词一起使用。While和as只能与连续性动词一起使用。why do you want a new job when youve got such a good one already？(get是一个临时动词。)你已经找到了这么好的工作，为什么还想找新的呢？why do you want a new job when youve got such a good one already？(get是一个临时动词。)你已经找到了这么

2、好的工作，为什么还想找新的呢？the students took notes as they listened(listen是持续动词)学生一边上课一边做笔记。2，when子句中的谓语动词可以在主谓语句动作之前、之后或同时发生。While和as子句的谓词行为必须与主句谓词行为同时发生。1节动作发生在周节动作之前，只使用when。When he had finished his homework，he took a short rest (finished先发生)他做完作业后，他休息了一会儿。When I got to the airport，the guests had left (got t

3、o后发生)我到达机场的时候，客人们已经离开了。2子句动作和主句动作同时发生，如果从句动作是连续动词，则可以同时使用when、while、as。When While As we were dancing，a stranger came in (dance是连续性动词)我们跳舞的时候，陌生人进来了。when while as she was making a phone call，I was writing a letter (make是连续性动词)她打电话的时候，我在写信。3周文章，如果子句动作同时进行，子句动作的时间概念就会模糊，主要用于表示发生主文章动作的背景或条件时，只能使用as。在牙齿点

4、，as通常表示“跟随”。意思是“一方，一方”。As the time went on，the weather got worse(as的意思是“跟随”)，the atmosphere gets thinner and thinner As the height increases随高度的增加而增加The little girls sang as they went女孩们边走边唱。4在未来开球中经常使用when，钟鼓要用一般时间代替未来时间。when the manager comes here for a visit next week，Ill talk with him about this下周经理访问这里的时候，我会和他谈谈牙齿的事。3，when用于表示“一个”的文章模式(参见过去的日子)。sb had hardly/scarcely done sth when hardly scarcely had sb done sth when，我闭上眼睛的时候有人在敲门。I had hardly scarcely closed my eyes when some one knocked at the do