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afraid of doing sth., afraid to do sth.

be afraid of sth.的意思是“害怕某物”， be afraid of doing sth.是担心做某事后出现某种后果，be afraid to do sth.是害怕做某事。如：

Are you afraid of snakes? 你怕蛇吗?

Don’t be afraid of any difficulty. 对任何困难都不要怕。

I am afraid of falling behind the others. 我怕拉到别人的后面。

She was afraid of waking her husband up. 她怕吵醒她的丈夫。(担心，希望丈夫多睡一会)

She was afraid to wake her husband up. 她怕吵醒丈夫。(害怕，丈夫可能生气)