1 . be afraid of sth 害怕某事。如：

Are you afraid of dogs? 你害狗吗?

There’s nothing to be afraid of. 没什么可害怕的。

比较：

He is afraid of her. 他怕她。

He is afraid with her. 跟她在一起时，他很害怕。

　　2 . be afraid of doing sth

担心会发生某事或某情况。如：

She was afraid of waking her husband. 她怕吵醒她丈夫。

I was afraid of hurting her feelings. 我怕伤害她的感情。

注：be afraid of doing sth 表示担心会发生某事或某情况时，其后也可用 be afraid that 替换。如：

He was afraid of losing face. =He was afraid he’d lose face. 他怕失面子。

害怕做某事或不敢做某事。如：

I’m afraid of telling her. 我不敢告诉她。

He was afraid of jumping. 他不敢跳。

3 . be afraid to do sth 害怕做某事或不敢做某事。如：

He was afraid to fly in a plane. 他不敢坐飞机。

He was afraid to go into the house and meet his father. 他不敢进屋去见他父亲。

注：以上两类句型的异同之处：表示担心会发生某事或某情况，只能用 be afraid of doing sth, 而表示害怕做某事或不敢做某事等，则两者都可用。如：

Don’t be afraid to ask [of asking] question. 不要害怕问问题。

He is afraid to go out [of going out] alone at night. 他不敢晚上一个人出去。