when 和while 的用法区别 两者的区别如下: 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,如: a
When the teacher came in, we were talking
当此句改变主从句的位置时,则为: While we were talking, the teacher came in
They were singing while we were dancing
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
The children were running to move the bag of rice when they heard the sound of a motor bike
孩子们正要跑过去搬开那袋米,这时他们听到了摩托车的声音
He is strong while his brother is weak
他长得很结实,而他弟弟却很瘦弱
引导时间状语从句时,WHILE 连接的是时间段,而 WHEN 连接的多是时间点 例如What does your father do while