当句子中有While时态如何使用,一般需要前后状态应该保持一致所以用,如果前面是进行时,那么后面自然也就使用进行时,如果前面是过去式,后面也要用过去式。
1、“当……时候”,引导时间状语从句(从句动作必须是延续性的)。
Please don't talk so loud while others are working. While I was cleaning the window,my finger was seriously cut.
2、“虽然,尽管”相当于although,引导让步状语从句(常把while放在句首)。
While she is a top student, she has some shortcomings. While the Internet is bridging the distance between people, it may also be breaking some home or will cause other family problems.
3、“只要,如果”等于as long as,引导条件状语从句。
There is hope while there is life. While you study hard, your effort will pay off.
①when是at or during the time that,既指时间点,也可指一段时间;
while是during the time that,只指一段时间,因此when引导的时间状语从句中的动词可以是终止性动词,也可以是延续性动词,而while从句中的动词必须是延续性动词。
②when说明从句的动作和主句的动作可以是同时,也可以是先后发生;while则强调主句的动作在从句动作的发生的过程中或主从句两个动作同时发生。
③由when引导的时间状语从句,主句用过去进行时,从句应用一般过去时;如果从句和主句的动作同时发生,两句都用过去进行时的时候,多用while引导。
④when和while还可作并列连词。when表示“在那时”;while表示“而,却”,表对照关系。
5.have done是什么时态 和have been done的区别