初中when和while的用法
初中when和while的用法如下：
一、when用法
1、用作疑问副词，引导特殊疑问句。
例句：When will you come to see me?你什么时候要来看我？
2、用作连接副词，通常用来引导主语从句、表语从句、同位语从句、宾语从句及起名词作用的“when＋动词不定式”结构。
例句：When he comes is not known.他何时来还不知道。
二、while用法
1、while意为“当……时候”，指一段时间，不能用来表示一个时间点。
例句：Whilethe discussion was still going on,George came in.当讨论还在进行时，乔治走了进来。
2、while意为“而；然而”，表示转折。
例句：There're plenty of rain in the southeast,whilethere's little in the northeast.东南部雨量充足，而西北部则很少下雨。
while和when的区别
while和when在表示“当…的时候”时，有些同学会觉得难以区分，但这又是常考的语言点，很是让人苦恼。
其实，要掌握它们的不同用法，先要了解动词的一个特征：短暂性动词还是延续性动词：while从句的谓语必须是延续性的；when从句谓语短暂性和延续性都可以。
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