this helps him start(s) the day?为什么start不加s,him不是三单吗

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this helps him start(s) the day?为什么start不加s,him不是三单吗

this helps him start(s) the day?为什么start不加s,him不是三单吗
this helps him start(s) the day?为什么start不加s,him不是三单吗

this helps him start(s) the day?为什么start不加s,him不是三单吗
help sb (to) do sth.中间的to可以省去,这里是不定式,不能用单三的.

help sb (to) do sth.

help sb. do sth.
这里start是不带to的不定式

在主动语态下,help sb do sth 和 help sb to do sth 都可以,但在被动语态下,不定式必须带 to,即 be helped to do sth