我不知道他为什么没有来：I do not know the reason why he did not show up

来源：学生作业帮编辑：神马作文网作业帮分类：英语作业时间：2024/11/12 14:08:30

我不知道他为什么没有来：I do not know the reason why he did not show up .
在一个复合句中主句是一般现在时那么从句是否时态可以是过去式或者与主句不一致?为什么使用did

I do not know the reason why he did not show up .
同位语从句,why he did not show up 解释reason
主句是一般现在时：I do not know the reason 表示一个一般状态,即我过去到现在一直都不知道
从句是过去式：he did not show up表示（过去）时点,他没有出现
从句与主句时态不一定一致,要看句意,不能学的太机械
再问： http://zhidao.baidu.com/question/478033076.html?quesup2 这个问题帮我看下
再答：帮你看过了

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