my sister does not have tobuy any vegetable today 这句话中的does为什么要用does而不用do

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第1个回答 2014-07-10

英语中，第一、二人称用助动词do，而第三人称，如he,she等用does。此处my sister是第三人称追问

如he,she等...... 怎么判断my sister是第三人称

追答

my sister可以用she来代替，如此，可以用he，she，it，they，等代替的均为第三人称

第2个回答 2014-07-10

主语是第三人称单数.动词用现一般时 does
这句话主语是my sister.我的姐姐.第三人称单数.所以用does追问

第三人称单数是 he she it

第3个回答 2014-07-10

my sister是第三人称，当然要用does了追问

怎么判断my sister是第三人称

追答

人物不是有第一人称，第二人称，第三人称吗
我是第一人称, 你是第二人称, 他、她、它是第三人称
举个例子：
如果你想说my sister很好，下面你介绍的时候，就会用she（她），说她怎样好怎样好
是不是？

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