be afraid of和be afraid to区别：

一、句型不同：

1、be afraid of doing/sth. 意为害怕，恐怕，担心某事物

例句：I used to be afraid of the dark.

我以前害怕黑暗。

2、be afraid to do sth. 意为不敢做……事

例句：Second, trust your ability. Don't be afraid to speak. Don't be trapped by shyness.

二、意义不同：

be afraid of doing担心出现doing的状况、结果。 doing 是客观上造成的，意为"生怕，恐怕"

例句：She was afraid of waking her hu***and.她生怕吵醒她丈夫（害怕吵醒时带来的后果）。

be afraid to do不敢，胆怯去做某事，是主观上的原因不去做，意为"怕"；

例句：She was afraid to wake her hu***and.她不敢去叫醒她丈夫（害怕去做“吵醒”这个动作）。