关于it 做形式主语句子的几个问题
（1）为什么有的时候是It be adj. for sb. to do sth.有时候却用It be adj. of sb. to do sth.差别在哪里？比如：
It is very difficult for me to do it.和
It was very kind of him to pay the bill.
（2）再看下这个句子:
You ought to have locked the door. That was very careless.
变成it引导的形式主语句子：It was very careless of you not to have locked the door.为什么不改成to have not locked the door?
谢谢！期待详细解答！特别是第2个问题！
而It be adj. of sb. to do sth中 adj 修饰的是 sb, 也就是说，adj说的是sb的特性
如： it is difficult for him to do the job.事实上是job 很difficult。
而 it is kind of you to do it for me.事实上是you 很kind.
2. 要否定一个不定式，就要把not加在不定式之前，而不是把not就在不定式表示的行为动作上，这是个规则。
关于it 做形式主语句子的几个问题
for讲的是行为动作本身的性质 而OF 是修饰做该行为的 人的 性质
关于it 做形式主语句子的几个问题
do it for me.事实上是you 很kind.2.要否定一个不定式，就要把not加在不定式之前，而不是把not就在不定式表示的行为动作上，这是个规则。
关于it 做形式主语句子的几个问题
1. It be adj. for sb. to do sth中 adj 修饰的是sth，也就是说，adj说的是to do sth的特性 而It be adj. of sb. to do sth中 adj 修饰的是 sb, 也就是说，adj说的是sb的特性 如： it is difficult for him to do the job.事实上是job 很difficult。而 it is kind of y...
it 作形式主语的问题
答案选D.It it 指代这件事，也就是后面的the way .he keeps changing his mind,是定语从句，修饰the way .当先行词是the way 时，常用that,或in which 引导定语从句，而that 或in which 可以省略。the way 以及它所引导的定语从句作it 的同位语。
it做形式主语的问题
第二句你看错了。it=the chair The chair is comfortable to sit on.英语中的句型：It's +adj. to do sth.---Sth is +adj. to do. 如：It's hard to learn English.=English is hard to learn.由于夲句用it代替了the chair，故带来了一定的麻烦。
关于it的形式主语 语法
★（1）充当形式主语，替代不定式、动名词、从句等，如：It is important for us to set goals.It is a great pity that he can’t attend the concert with us.注意：①当句子的表语是a waste of time, no use, no good 等时，真正的主语常使用动名词，其句式为“It is a waste time\/ ...
it 做形式主语时、句子是主语从句么?
形式主语it 作为形式主语的it并无实际语义,只是为满足语法上的需要,避免句子头重脚轻,它代替 的是句子的逻辑主语,概括起来会有如下情况: 句子的逻辑主语为不定式 如:It is very kind of you to give me a hand in time. It is my pleasure to address the meeting. It was pretty hard for him to ...
关于it的形式主语问题?这句话老师说错了,但没说错哪儿…改错也得用...
It 做形式主语 可以代替不定式 动名词 和主语从句 It is very difficult to learn English well.It is worth reading more books It is well known that Yuan Longping is a famous scientist 不定式作主语强调临时的动作，动名词作主语强调习惯 To give is better than to receive Doing eye ...
it做形式主语时,应注意什么。
在句子中做形式主语，真正主语是不定式to criticize others.it+be+名词+不定式（to do ）It was his duty to take care of the orphans.照顾孤儿是他的职责。it+be+名词后面也加动名词doing，如It is no use\\good studying for an exam at the last minute.临时抱佛脚来应考是没用的\\没好处。...
it作为形式主语的问题?
两句话表达法的意思是一致的。不过第一句有点中式英语的风格，不属于地道英语。而常用的反而是第二句。it作形式主语，不定式作真正的主语。
