It is quite important for us to keep healthy.为什么是for不是to?

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for：prep.为,为了；倾向于；关于；当作
conj.因为,由于
to：prep.向,往,给...,于...,直到...为止,在...之前,比,对,[表示程度、范围] 到,达
　　情态动词后不加to直接加v.（原）
　　行为动词加to do sth.（如：need)
你看在这里,for us 是“为了我们”,to us 是“对我们”.
个人感觉,to us 语气比较硬,for us 语气比较友善.

It is quite important for us to keep healthy.为什么是for不是to? It is important for us to keep healthy 改为同义句将keep healthy 改 for us 做什么句子成分?是状语么?It’s important for us to keep healthy.. It's very important for us to keep healthy To eat healthy food is important for us. ( )( )important for to keep healthy is very important for us转为（）very important （ To eat healthy food is very important for us.改同义句是 It's very It's very important for us to keep healthy.同义句英语翻译How to keep healthy?Health is very important for us.But 英语：It's important for us to eat healthy It is important for us to ______. It's______（well)for us to keep healthy.