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Why的句型结构一、why引导的特殊疑问句询问具体的、直接的原因时，常用because开头的句子回答。构成形式分两类：no.1 对形容词或副词提问其结构为： why + be. Why not和 why don't的区别主要句型意思用法why not和 why don't的区别及用法：1、why not和 why don't两个句型意思基本相同，一般可以替换。2、why not 的意思是：为什么不做某事呢？.

Why not和 why don't的区别： 1、两个句子结构不同：why don't + 主语 + 动词；why not一定要直接跟动词，动词前不能有其他成分 2、why don't 结构可以有时态的变化，比如变为过去why. 主语从句 why he took chinese nationality in 1901 is a question that interests us. Can you explain the reason why/ that you are late for school?