she now works as a math teacher at a high school work为什么+sshe now works as a math teacher at a high school work为什么+s

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she now works as a math teacher at a high school work为什么+sshe now works as a math teacher at a high school work为什么+s
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she now works as a math teacher at a high school work为什么+sshe now works as a math teacher at a high school work为什么+s
she now works as a math teacher at a high school work为什么+s
she now works as a math teacher at a high school work为什么+s

she now works as a math teacher at a high school work为什么+sshe now works as a math teacher at a high school work为什么+s
因为she 是第三人称单数

she是第三人称单数,作主语时,谓语动词用单数,所以加s

如果句子是现在时一般式,主语是第三人称(he、she 、it),谓语动词要加“s”,这就是所谓的“动词第三人称(变位)规则”。本句就是属于这种句型。
请有空看看语法书。