what are you going to do this sunday中为什么用are

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whatareyougoingtodothissunday中为什么用arewhatareyougoingtodothissunday中为什么用arewhatareyougoingtodothissun

what are you going to do this sunday中为什么用are
what are you going to do this sunday中为什么用are

what are you going to do this sunday中为什么用are
be going to do 是一个固定句型,计划将要做.
这里主语是you,所以要用are going to do,变成疑问句时要把are提前.

be动词的搭配中, 第一人称就是我“I” 后面跟am ,变过去式用was;
第二人称就是你“you” 后面用are,变过去式用were;
其他的单数用is,复数用 are。

your are, I am, it is 这些都是固定搭配

因为you是第二人称啊,第二人称的be就是用are,第一人称用am,第三人称用is。