He must try to help his sister with her math?为什么try不加s

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He must try to help his sister with her math?为什么try不加s
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He must try to help his sister with her math?为什么try不加s
He must try to help his sister with her math?为什么try不加s

He must try to help his sister with her math?为什么try不加s
must是情态动词 后面加动词原形 所以不加s

must 后 加 动词原形

must是情态动词,后面只能接动词原形

must情态动词,后跟动词原形

既然大家都说了 我就不回答了 嘿嘿

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