there's nothing to be afraid of.为什么要有to be和of?

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there's nothing to be afraid of.为什么要有to be和of?

there's nothing to do 和 be afraid of 为固定搭配

be afraid of 是一个词组,为固定搭配,to后面跟动词原形,所以用to be

这是一种习惯用法
There is nothing to be afraid of