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"，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".例如：

　　She was afraid to step further in grass because she was afraid of being bitten by a snake.

　　她生怕被蛇咬着，不敢在草丛中再走一步。

　　She was afraid to wake her husband. 她不敢去叫醒她丈夫。

　　She was afraid of waking her husband. 她生怕吵醒她丈夫。