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Who comes to school earlier,Mike or Jack?a,jack does b,jack

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Who comes to school earlier,Mike or Jack?a,jack does b,jack comes
Who comes to school earlier,Mike or Jack?a,jack does b,jack
a,jack does
答语中用助动词does代替前文的comes
再问: 为什么要代替呢
再答: 如果你还用comes,那么Jack comes 不是一个意思完整的句子。我们用does事实上代替的是comes to school earlier.整个谓语部分 又如。 Does he run fast? Yes , he does( does =runs fast)