l'm afraid of _____(swim)in the sea.swim要不要变成现在分词?

l'm afraid of _____(swim)in the sea.swim要不要变成现在分词?

要的,be afraid of doing sth.固定结构

需要，of后面要接doing。

of 后接名词代词动名词，swimming

swimming
of后跟动名词

要
of是介词，介词后动词要变成ing形式

嗯。be afraid of doing sth...所以空格处要填swimming。