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Why you no have been in class the last couple of days?

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Why you no have been in class the last couple of days?
改错,语法错误,不止一处或许,
Why you no have been in class the last couple of days?
Why you no have been in class the last couple of days?
正确的句子应该是:
Why have you not been in class the last couple of days?
再问: 有什么原理么解释一下。。
再答: Why have you not been in class the last couple of days? 这是一个【否定特殊疑问句】。特殊疑问句的构成就是:特殊疑问词+一般疑问句。 否定的一般疑问句的构成是:助动词+主语+否定词not+实意动词+其他。
再问: 那the couple of days要不要加个for呢
再答: 在the couple of days短语前面【不需要加介词for】。