She usually stays at home.这是陈述句吗?为什么动词要+s?

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Sheusuallystaysathome.这是陈述句吗?为什么动词要+s?Sheusuallystaysathome.这是陈述句吗?为什么动词要+s?Sheusuallystaysathome.这是

She usually stays at home.这是陈述句吗?为什么动词要+s?
She usually stays at home.这是陈述句吗?为什么动词要+s?

She usually stays at home.这是陈述句吗?为什么动词要+s?
陈述句,she是第三人称单数,所以动词用第三人称单数形式,后面要+s