说到语法，对于O-Level考生来说都是很懵的状态，搞不清楚语法到底是什么？O-Level语法知识点其实不多，但是比较杂，难以区分，今天新加坡教育网就对英语的语法知识点It作了分类整理，一起来看看吧。
一、It作形式主语的句型
㈠ it 代指不定式短语的句型
1. It takes+ (sb.) + sometime / some money + to do sth.做某事花去某人多长时间
It takes five minutes to walk there.走到那里需要5分钟。
It takes a lot of money to buy a house like that.买那样一幢房子需要很多钱。
2.It takes +名词+ (for sb.) to dosth.某人做某事需要… …
It took great imagination as well as patience for Annieto teach me to speak.
对安妮来说，教我说话需要极大的信心和想象力。
It takes time for them to prepare for the great changesthat take place in space.
他们需要很多时间准备应付太空中所发生的巨大变化。
3.It is +形容词+ (for / of sb.)to do sth.某人做某事是… …的
常用于该句型的形容词比较多。for sb.的句型常用于表示事物的特征特点，表示客观形式的形容词，如easy,difficult, hard, important, possible, impossible, comfortable, necessary,better等。
of sb的句型一般用表示人物的性格，品德，表示主观感情或态度的形容词，如kind, nice, stupid, rude, clever, foolish, thoughtful,thoughtless, brave, considerate(考虑周到的), silly, selfish(自私的)等。
It was kind of you to help us.谢谢你对我们的帮助。
It is getting harder every day for a lazy man to get aliving.懒汉谋生是越来越困难了。
4.It is +名词+ to do sth.做某事是… …的
常用于该句型的名词有：manners,duty, fun, good, a great honour等。
As a student, it is bad manners to come late to class.作为学生，上课迟到是没有礼貌的。
It is our duty to pay taxes to our government.向政府交税是我们的义务。
5.It is + one’s turn + todo sth.轮到某人做某事
It was my turn to clean the blackboard.轮到我擦黑板了。
It is his turn to take the children to school.今天该轮到他送孩子们上学了。
6.It is + up to sb. + todo sth.做某事是某人的责任或义务
It’s up to us to give them all the help we can.我们理应竭尽所能地给予他们帮助。
It’s up to you to decide whether to go or not.应该由你决定是否去。
㈡it代指动名词短语的句型
7.It is +名词+ doing sth.做某事是… …
用于该句型的名词有：no good, no use, hard work, a nuisance, a waste of time,a great honour等。
It’s no use talking to him about it.和他谈论此事是没用的。
It is hard work keeping the grass green at this time ofyear.
这个季节还使草保持绿色真是不容易。
It’s a waste of time your talking to him.你和他谈话是浪费时间。
8.It is +形容词+ doing sth.做某事真… …
用于该句型的形容词有：pleasant, useless, senseless, worthwhile, dangerous等。
It was pleasant meeting you in London that day.那天在伦敦见到你真高兴。
Is it worthwhile making such an experiment?做这样的实验值得吗？
㈢it代指名词性从句的句型
9.It + be +名词+ that从句
用于该句型中的名词有：a pity, a shame, a fact, an honour, a wonder, a goodthing, good news, no wonder等。
惯用句型有：
It is common knowledge that… ……是常识
It is a surprise that…令人惊奇的是……
It is a fact that…事实是……
It is no wonder that…难怪… …
It is a pity that she has made such a mistake.真遗憾，她犯了这样一个错误。
It is a shame that you have to leave so soon.你必须这么早离开，真遗憾。
10. It + be +形容词+ that从句… …是… …
用于该句型中的形容词有：clear, obvious, true, certain, important, strange,natural, surprising, fortunate, good, wonderful, funny, possible, impossible,likely, unlikely, quite clear, unusual等。
惯用句型有：
It is necessary that…有必要……
It is important that…重要的是……
It is obvious that…很明显……
It is important that we (should) learn English well.我们学好英语是非常重要的。
It is necessary that the students (should) remember allthe new words.学生记住所有的新单词是必要的。
11. It + be + -ed分词+ that从句据… …是… …的
常见的过去分词有：said, reported, learned, announced, known, decided,expected, believed, considered, declared, felt, hoped, seen, supposed, thought,understood等。
惯用句型有：
It is said that…据说
It is reportedthat…据报道
It is believed that…大家相信
It is hoped that…大家希望
It is well known that…众所周知
It is thought that…大家认为
It is suggested that…据建议
It has been decided that…大家决定
It must be remembered that…务必记住的是
It is reported that another man-made satellite has beenput into orbit.
据报道，又有一颗人造卫星被送入轨道。
It is said that he has gone to theUSAfor furtherstudy.据说他已去美国深造了。
12. It +及物动词+名词+从句
It makes no difference to me whether it’s foggy or clear.
对我来说，天气有雾或晴朗没什么关系。
It doesn’t make any difference to me whether he goes ornot.
不管他是否去对我都没有什么影响。
13. It +不及物动词+ that分句
常见的不及物动词有：seem, happen, look, appear, come about, turn out, occur等。
惯用句型有：
It appears that…似乎……
It (so) happens (that)… （那么）碰巧……
It occurred to me that…我突然想起……
It seems that he is sick. (= He seems to be sick.)看来他似乎有病。
It happened that he wasn’t there. (= He happened not to bethere.)碰巧他不在哪儿。
14. It doesn’t matter (to sb.) +从句（对）… …都无所谓
It doesn’t matter to me what he says.对我来说，他说什么都无所谓。
It doesn’t matter if we are late.我们就是晚到一点也不要紧。
注意：It is demanded / necessary / a pity + that…结构中的主语从句谓语动词要用should加动词原形，should可省略。其句型为：
(1)suggested
It is(2)importantthat…+(should) do
(3) apity
(1) suggested, ordered, proposed, required,demanded, requested, insisted + (should) do
(2) important, necessary, natural, strange +(should) do
(3) a pity, a shame, no wonder + (should) do
It is suggested that we (should) hold a meeting nextweek.
It is necessary that he (should) come to our meetingtomorrow.
二、It 作形式宾语的句型
㈠it代指不定式短语的句型
15.主语+ find(make, feel) it +形容词(+ for sb.) + todo sth.
I find it easy enough to get on with Tom.我觉得与汤姆相处很容易。
I felt it necessary to speak about my shortcomings.我感到有必要讲一下我的不足之处。
16.主语+ find(make, feel) it +名词+ to do sth.
He felt it his duty to mention the fact to Mr. Smith.他觉得把事实告诉史密斯先生是他的职责。
People in the west make it a rule to buy Christmaspresents for their relatives and friends.西方人把为亲友买圣诞礼物作为一种惯例。
㈡it代指动名词短语的句型
17.主语+ think + it +名词+ doing sth.
We thought it no use doing that.我们认为做那件事是无用的。
You must find it exciting working here.你一定会发现在此工作是很令人兴奋的。
18.主语+ think + it +形容词+ doing sth.
I think it very unwise going on as we are withoutdefinite agreement.
我认为像我们这样没有确定协议而进行是不明智的。
I don’t think it worthwhile taking such trouble.我想不值得这么费事了。
㈢it代指名词性从句的句型
19.主语+ find(make, think) it +名词+ that从句
I used to feel it a terrible thing that my mother shouldhave to do the housework endlessly.我曾老觉得母亲不得不无休止地做家务是一件可怕的事情。
I consider it a great shame that I didn’t pass theexamination.我认为我考试不及格是件非常羞耻的事。
20.主语+ find(make, think) it +形容词+ that从句
I think it best that you should stay here.我认为你最好呆在这里。
You may think it strange that anyone would live there.你也许感到奇怪，居然有人愿意住在那儿。
21.主语+ take it for granted + that从句
I take it for granted that you will be coming to themeeting.我当然认为你会来参加会议。
I took it for granted that you would stay with us.我以为你当然会留在我们这里。
22. I hate(like, enjoy, love) + it + when从句我不喜欢/喜欢… …
该句型中it用于hate, like, enjoy, love等动词后，充当形式宾语。
I hate it when people talk with their mouths full.我很不喜欢人们吃着东西说话。
I like it in the autumn when the weather is clear andbright.我喜欢秋天清爽明朗的日子。
以上就是小编为大家整理的关于新加坡O-Level英语中it句型汇总，希望对大家的备考有所帮助。更多O-level考试报名时间、如何准备O-Level考试等问题可以咨询我们。
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