1、 be afraid of sth (sb) ；

害怕某事(某人)。

2、be afraid of doing sth ；

担心会发生某事或某情况(但实际上未必会发生)。

3、be afraid to do sth；

害怕做某事或不敢做某事。

4、be afraid of (that)；

害怕什么。

例句：

1、She was afraid in a way that was quite new to her.

她感到从未有过的害怕。

2、"I'm afraid he's ill." — "I'm sorry to hear that."

“恐怕他生病了。”——“真是遗憾。”

3、Why should a great community like a university be afraid of nihilism?

为什么像大学这样人才济济的社区要害怕虚无主义呢？

4、He was a little bit afraid of his father's reaction.

他有点害怕父亲的反应。

5、I'm afraid I have to answer a call of nature.

抱歉我要去趟洗手间。