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why do you come back so early? 可不可以改为why are you come so ear

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why do you come back so early? 可不可以改为why are you come so early? be 动词与助动词的区别到底是什么
why do you come back so early? 可不可以改为why are you come so ear
不可以,do是帮助动词完成疑问和否定的,只要有动词（come）的句子都不能再有be了.
再问： 那么what are you reading? reading 不也是动词，前面卫什么有are
再答： do只用于对有动词的句子中对动词提问和否定，如：I love you 中love 是动词，如果要问你爱我吗就是do you love me? 如果说我不爱你：i don't love you.不能直接说you love me?和i love not you. be 只在没有动词的时候用，翻译成是。 I‘m a student. 疑问和否定的时候直接在be后加not.
再问： what are you reading ?里不也是对动词提问
再答： what are you reading? 是现在进行时，are 只表示时太，不表示疑问，what才表示疑问 看多了就会了，慢慢来。
再问： 请你再多举一些例子来讲解
再答： what are you reading? 直接翻译就是：什么是你正在做的？通顺一点就是你在做什么？ do you love me?里的do翻译为吗，你爱我吗？
Why did you come back so Why did you come back so early?The English party has been ( why are you so why did you come back so late today?it heavily when the meet why do you do go to bed so early today Why do you set out so early in the morning? why don't you bring it on so come on Why did you come here so late?Sorry.I( )the 'Why do you think so?' Why do you think so? why do you say so? why are you so serious?