it是主语时，动词后面能接to do吗？

Question

it is said

Answer 1

动词？这样提问看不太明白唉。如果it是形式主语，例如it is+adj.（形容词）+ to do sth.（做某事）就是对的啊。追问

It is said?

追答

举个例子： it is hard to speak English.
这里hard 是形容词， speak English 是动词短语。

it is said that +句子 是一种固定用法，例如： it is said that Lily is a good girl. 据说Lily是个乖女孩。 这里不是你提问的内容，算是扩展吧。
it的用法千变万化，一定要做一个总结比较难，可以看看相关的语法书，平时看到多积累，毕竟万变不离其宗啊~

Answer 2

动词后是否能接to do 形式,取决于动词本身,不受主语影响.
I want to buy some books.
I want to try to win the prize.
It wants to drink some water. it 指代动物
It needs to be done.
It seems to be true.
It says NO PARKING.
It looks nice.

Answer 3

那要看情况来定：it is said（据说）它相当于一个成语，后面常常带that引导的从句。这种句式中it为形式主语，that引导的从句是真正主语，所以叫主语从句。