散文精选网when和while的区别，when和while的区别和用法？
（一）过去进行时
表示在过去某一时刻/某一时段正在进行的动作。
谓语构成：was/were（助动词）+动词现在分词
例如，1.The students were drawing pictures at three yesterday afternoon.
句式转换，
一般问句：Were the students drawing pictures at three yesterday afternoon?
否定句： The students were not drawing pictures at three yesterday afternoon.
特殊问句：When were the students drawing pictures?
What were the students doing at three yesterday afternoon?
2.I was tidying my sitting room the whole morning.
过去进行时标志性时间状语有：then(那时)，last night（昨晚），at that time(当时)，at…yesterday(昨天…点)，the whole morning(整个上午)this time yesterday（昨天这个时候）等等。
（二）while和when的区别（在引导时间状语从句时）
when 意为“当……时”“每逢”
while意为“当……时”“在……期间”“在……（过程）中”
区别：1.主句中谓语动词和从句的谓语动词
when 主句从句谓语动词可以同时发生。从句动词也可以在主句之前/之后发生
while 强调从句谓语动词和主句中动词同时发生，但持续时间一般较长或者主句的动作在从句的动作发生过程中发生的。
例子，While we were talking，he came in.
I lived in a hotel while I was a student.
When I returned，the door was open.
When his father died，he was only nine.
有时候可以替换。
When/While we were dancing，a stranger came in.
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网友提问：
when和while的区别，when和while的区别口诀初中？
区别在过去进行时当中when和while的用法？
优质回答：
when 和while的用法区别如下：
1、when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。
2、when 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.
b、They were singing while we were dancing.
4、when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。如：
a、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。
b、He is strong while his brother is weak.他长得很结实，而他弟弟却很瘦弱。
