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

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

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