题目内容：

是'i am good at swim'还是'i am good at swimming'?

优质解答

no,no,no!不要被误导了,我们可以说 "go for a swim(名词）" OR "have a swim（名词）"
但是at是一个介词,后面应该跟一个动词ing形式,所以是"i am good at swimming."
当然介词后面也可以加名词,例如"i am good at study."