they are having a great time___in the pool.横线上是填to swimming 还是swimming
问题描述：
they are having a great time___in the pool.横线上是填to swimming 还是swimming
答
swimming
have a good time doing 可以当短语记忆
也可以用非谓语来解释
句子中谓语 are 所以swim 要用非谓语
非谓语动词Ing表主动 to do 表目的或者将来
swimming 是主动哦