I'm afraid of doing是怕发生什么什么事,如怕死,怕被爸爸打之类的.
例:I'm afraid of being beaten.
I'm afraid to do是怕(不敢)去做什么事,比如怕写作业.
例:I'm afraid to tell him the truth.

afreid of 是什么意思？

be afraid of ... 害怕......

固定词组

be afraid of和be afraid to有什么区别

您好，通常的使用方法是：

1）be afraid of (doing) something/somebody，也就是 afraid 加 of 的后面接动名词、名词、名词性词组。比如：
I am afraid of swimming.  （swimming 属于动名词）
I am afraid of going out at night.  （going out 属于动名词词组）
I am afraid of dogs.  （dogs 属于名词）

2）be afraid to do something，也就是 afraid 加 to 的后面接动词或是动作
I am afraid to go out at night.  (go out 属于动词词组）
I am afraid to look at my father when he is angry.  (look at 属于动词词组）

afraid 后面还可以接 that 引导的从句：
I am afraid that I can't come tonight.