问题描述：
英语does is区别用法?
如,Dad isn not at home.为什么不是Dad does not at home.She does not come from China.为什么不是She is not come from China.（对了,come还用不用加s)
如,Dad isn not at home.为什么不是Dad does not at home.She does not come from China.为什么不是She is not come from China.（对了,come还用不用加s)
问题解答：
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