i often help my mother with the housework on sundays.为什么用with?

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i often help my mother with the housework on sundays.为什么用with?
i often help my mother with the housework on sundays.为什么用with?

i often help my mother with the housework on sundays.为什么用with?
这是固定短语呀.
help sb with sth
帮助某人做某事
我在星期天经常帮助妈妈做家务.