Thegirlisafraidtocrossthebridge中为什么又有be动词又有动词呢？

Question

如题所述

Answer 1

The girl is afraid to cross the bridge.
be afriad to 害怕做某事，后面直接跟动作.
或者改成
The girl is afraid of crossing the bridge.
be afriad of 介词of后面跟动名词
总结：
be afriad to do sth.
be afriad of doing sth.