they are having a great time___in the pool. 横线上是填

they are having a great time___in the pool. 横线上是填to swimming 还是swimming ?为什么?急用。

swimming,to是不定式后面要跟动词原形,这里的swimming是现在分词做状语。
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第1个回答  2014-05-11
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

又看到这道题了呢~
希望能帮助到你~^ ^追问

谢谢,你的分析,很容易让我理解哈。

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