It is beneficial for us to do morning exercise.还是It is beneficial to us to do morning exercise.beneficial怎么用,是to sb 还是for sb.像 Sunlshine is beneficial to plants这里是用to 的.
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It is beneficial for us to do morning exercise.正确
======以下答案可供参考======
供参考答案1:
因为有一个固定搭配：it is加adj(for sb.)to do sth.其中的it是形式主语，真正的主语是to do sth.然而Sunlshine is beneficial to plants中并不是这样，这里面是be beneficial to do stn.
供参考答案2:
用for.