第三人称的否定句动词不用变，用动词原形就行了。因为在否定句中，我们需要用到助动词，如果是第三人称单数，助动词一般有doesn't(一般现在时）和didn't(一般过去时)，在助动词后面，动词就要用原形。如:Kangkang doesn't come to school by bus today.或者kangkang didn't come to school by bus yesterday.
第三人称的否定句动词要变吗
当主语是第三人称单数的时候，变为否定句，原来的动词形式要变回原形的。比如一般现在时态的句子:
He often goes to achool at seven.
否定句: He often doesn't go to school at seven.
又比如过去时态的句子:
He went to school at seven yesterday.
否定句:He didn't go to school at seven yesterday.
第三人称的否定句动词要变吗
在英语句型中，第三人称的肯定句时谓语动词要使用第三人称单数形式，变否定句时要借助于助动词doesn't，助动词doesn't 后要加动词原形。所以要变化。
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