When is he going to play the piano?这个句子里面PLAY是实义动词为什么IS那里不是用DOES?

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When is he going to play the piano?
这个句子里面PLAY是实义动词为什么IS那里不是用DOES?

这是个 be going to do 表将来的结构,is 在这里是助动词,play 是实义动词
整句翻译：他什么时候要弹钢琴?
你说的用助动词 does 是一般现在时,如：When does he usually play the piano 他什么时候经常弹钢琴?
不明白的再问哟,请及时采纳,多谢!

因为play是用在动词不定式里面的。不是一个独立的动词用法，所以不算数。

学习是一件愉快的事！ (*^__^*)
请及时采纳，多谢！

因为 is going to 已经是助动词结构了，所以does就不能参与了。

be going to do sth。是现在进行时表将来时，如：he is going to do that.变成一般疑问句就是is he going to do that?
这句话只不过好是加了个特殊疑问词when么。

be going to do sth

您可以先将其转换为陈述语序,即He is going to play the piano.于是您可以发现一个语言现象：be going to do sth.意为将要/打算做某事，它是将来时态的另一种表达方式。于是由于短语中出现了be，所以提问时就不用does了。好比What can I do?中用的是can,也没有使用其他助动词进行提问。
祝学习进步，望采纳，谢谢！...

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这是一般将来时的特殊疑问句把be going to 中的be动词提前陈述句应该是he is going to play piano 所以提问时间就变成了When is he going to play the piano

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