They wanted to have a swim 中为什么是用have a swim 而不是用have a swim

They wanted to have a swim 中为什么是用have a swim 而不是用have a swim have a swim they （have）a swim yesterday afternoon Are you going to have a swim? I often have a swim. have a swim怎么造句 I have a swimming lesson为什么swim用ing形式 Have a swim 还是have a swimming have a swim还是have a swimming swim可以作名词为什么是go swimming 而have a swim have a swim in the sea inside swim have fish bladder a