where are they come from为什么不对?

题目

where are they come from为什么不对?
说他们来自那个国家为什么要用
where do they come from?
where are they come from 为什么不对?
do 和 are各在什么情况下用呀?

答案

正确的说法是where do they come from?where are you from?之所以不能说 are they come from的原因是 are是be动词,后面不能跟动词原形,因为be动词本身就是动词,做谓语,后面跟非谓语形式,例如不定式,动名词和过去分词...