通俗地说,在口语中,形式主语是用it放在句首代替当主语的动词不定式,以避免头重脚轻,失去平衡:
It is difficult to answer this question. 这是个很难回答的问题。
=To answer your question is difficult.
动词不定式的逻辑主语是执行这个不定式动作的人:
It is difficult for me to answer this question. 要我来回答这个问题有困难。
=For me to answer your question is difficult.
There are still many questions for us to discuss.我们还有许多问题要讨论。
He is always the first (person) to come.他总是第一个来的。
It's foolish of him to believe what she said.他相信她说的话真愚蠢。
为您解答
逻辑主语不一定写出来,但是逻辑上,常识上,动作的发出者就是它,那么这个它就是逻辑主语。
Do you have anything for me to take?to take的逻辑主语就是i
形式主语一般由it做,通常和真正主语相对,比如形式主语句
It is important for you to remember that.
For you to remember that is important.
不定式是真正主语,it代的是这个主语,所以it是形式主语。
等大神给您答吧