it和that的用法详细一点 一点点列出来 要有个例句 好的+分差不多要高三的水平 不是区别it that

It做形式主语,代替由不定式,动名词短语或是从句所表示的真正的主语.如It’s no use talking to him about it.
It做形式宾语,代替一个由不定式,动名词,或是宾语从句,如I think it no use arguing with him.
it可以指季节,时间, 距离
如 It was mid summer.
It’s only five miles.
同时在强调句中,It + be + 要强调的部分+ that(who, whom) + 句子其他部分 .这个句型很重要,记住即可.
that有些固定的搭配 如 so that ,such that.
that 用作连词,引导名词性从句,状语从句和强调句.
1. that名词性从句.
①引导宾语从句.及物动词后的引导词that可省略.
I didn't expect (that) he could win the championship.
The teacher pointed out that Tom was not working hard enough.
② 引导主语从句.通常采用it作形式主语的句型.
That the earth goes around the sun is known to everyone.
（It is known to everyone that the earth goes around the sun.）
③引导表语从句.
The trouble is that we are short of money.
④引导同位语从句.
引导同位语从句的that和引导定语从句的that是不同的.前者只起语法作用,在从句中不作任何成分；而后者在定语从句中作主语、宾语或表语.举例说明：
The news that he resigned from office surprised us.
The idea that he holds is very common nowadays on campus.
2. that引导状语从句
①引导目的状语从句.
Bring it nearer that I may see it better.
②引导结果状语从句.
What have I done that he should be so angry with me?
③引导原因状语从句.
I am afraid that I will fail in the driving test.
④引导让步状语从句.意为“虽然、尽管”.
Difficult that/as the task was, they managed to accomplish it on time.
⑤引导条件状语从句.意为“假使、假设”.
Supposing that you were in my position, what would you do?
On condition that you were lost in the desert, you should ask for help as soon as possible.