It is dangerous for little children to swim in the river.为什么这里用to swim
人气：491 ℃ 时间：2019-08-20 16:08:44
解答
固定句型
It's + 形容词 + for sb.+ to do sth.
真正的主语是动词不定式 to do sth.
To swim in the river is dangerous for little children.有点头重脚轻,所以用形式主语it
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