I have to help my mum doing housework错误在哪

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I have to help my mum doing housework错误在哪
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I have to help my mum doing housework错误在哪
I have to help my mum doing housework错误在哪

I have to help my mum doing housework错误在哪
I have to I have to help my mum (to) do housework.
help sb (to) do sth 帮助某人做某事 to 可有可无