1、be afraid to do;

She was afraid to do a presentation. 她害怕做演讲。

I am afraid to fail a course. 我害怕会挂科。

2、be afraid of doing sth;

I'm afraid of being late for class.我害怕迟到。

I afraid of speaking English.我害怕说英语。

3、get old feet.

She got cold feet before her wedding.她在婚礼前临阵退缩。

I'm getting cold feet. Someone please help me.我太紧张了，谁能帮我？