be afraid to do 和 be afraid doing 的区别?

首先,be afraid是没有be afraid doing sth的
只有be afraid to do sth 和 be afraid of sth/doing sth

1. be afraid to do 指的是按照经验或常识不敢去做某事,或没有勇气去做某事.如：
I’m afraid to jump into the river. 我不敢跳进河中.
注：在现代英语中,有时也可用 be afraid of doing 结构来表示上述意思.如：
Don’t be afraid to ask (或of asking) for help. 不要怕请求帮助.
2. be afraid of doing 主要用来谈论一件自己(指句子主语)不希望也不能决定而可能突然发生在自己头上的事,这种事往往带有一种疑惧性,即可能发生也可能不发生,只是自己有这样一种得心(即担心发生).此进不能用 be afraid to do 结构.如：
She was afraid of waking her husband. 她怕吵醒她丈夫.
I was afraid of hurting his feelings. 我怕伤了他的感情.
请再体会下列句子
I’m afraid to speak English before so many people because I’m afraid of making mistakes. 我不敢在那么多人面前说英语,因为我怕出错.