un 是动词.语法应为主语+谓语动词.则为I run.am也可作为动词,两个动词不能并用.但I am 后面可以接名词或形容词或动名词,成为主语+系动词+表语结构.而根据every morning 可知,是一般现在时 .不是现在进行时.所以为I run.就算是现在进行时也应为I am running.没有I am run的表述形式.
What do you do every morning 的答句为什么是I run而不是I am run
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