It is dangerous for little children to swim in the river.为什么这里用to swim

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It is dangerous for little children to swim in the river.为什么这里用to swim

It is dangerous for little children to swim in the river.为什么这里用to swim
It is dangerous for little children to swim in the river.为什么这里用to swim

It is dangerous for little children to swim in the river.为什么这里用to swim
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

it is 形容词 for sb to do sth 对某人来说做某事怎么样 英文中常用的一个结构

it作形式主语, to swim 是真正的主语
it is +形容词+to do sth
祝你进步

这个可以这么理It is +形容词+for sb to do sth 。It is +adj.+for sb.+to do sth表示做某事对某人来说很adj.
例如:It’s difficult for us to finish the work. 对我们来说,完成这项工作很困难。

动词不定式作主语,IT 是形式主语,这句话也可以这样说:To swim in the river is dangerous for little children .( 英语中使用IT 作形式主语很常见,即 It 's +adj +for sb + to do sth ,是为了避免句子‘头重脚轻’)

句型:It is + 形容词 (for sb.)to do sth. 表示“做某事很。。。”
to 就是表目的“去。。。”
eg. It is happy for you to find a good job.

这是很基本的句型结构,记住就ok,不必管为什么,把英语当数学会越学越南的

因为前面有to所以只能后跟动词原形
有句型IT IS ADJ. FOR SB. TO DO STH.