1. be afraid of +sth 强调害怕的事
But what was there to be afraid of?
但是到底有什么好害怕的？
Do not be afraid of the loneliness of enlightenment.
不要害怕因造诣深而产生的孤独感。
2. be afraid to +do sth 害怕去做某事，强调动作
Do not be afraid to change something in your life. You just might like it.
在生活中不要害怕去改变什么，你或许会喜欢改变的东西。
Don’t be afraid to ask why, and what if, and why not?
不要害怕去问为什么、如果怎样或者为什么不呢？

afraid of 和to！？！？~！？！？@？#？#？！？？#有什么区别啊

be afraid of sth /doing sth 想到某事就害怕;如：He is afraid of snakes.
be afraid to do sth 害怕做某事 如：I am afraid to tell him the truth .
希望可以帮到你！