1、1It 的特殊用法一、作形式主语1 （1）Its + adj.+ to do sth.Its important to study English well.(2 ) Its + adj. +thatIts important/ necessary/ likely/ possible/ certain/thatIts likely that he will win the game.Its certain that he will come this afternoon.2. Its + v-ed + that(1) Its said/ thought/ believed/ supposed/
2、 reported/ proved/ knownthatIts known that the earth travels round the sun.= As is known to everybody, the earth travels the sun.= What is known to everybody is that the earth travels the sun.(2) Its suggested/ advised/ proposed/ requested/ required/ insisted/ commanded/ demanded/ ordered/thatIts su
3、ggested that she（should ）finish her homework this afternoon.Its required that I (should) go at once.3. (1) Its + 名 +that 常见的名词有：a pity, a fact, an idea, an honor, no wonder 等Its a pity that he cant come to the party.Its a fact that he didnt pass the exam.Its a good idea that well go outing.Its an ho
4、nor that I was invited to the meeting.(Its)no wonder (that) he always takes the first place in the exams.(2) Its + 名 +doing 常见的名词有：use, good2Its no use crying.Its no good crying over spilt milk.【谚语】牛奶溢了，哭也没用。 （覆水难收）4. It + 动 + that常见的动词有：happen, seem, matter 等It happened that I hadnt money with me.I
5、t seemed that he had known the factDoes it matter that he doesnt come二、作形式宾语1. 用于复合结构，可以用一句话“没克服它”来记忆如下六个动词：make, consider, feel, find, think, take.He made it clear that he was not interested in English .He considered it a good idea to go outing with me.I feel it a great honor to be invited to speak
6、 here.I find it very interesting to study English.I think it no use arguing with her.I took it for granted that he would give me some help.2. 用于表示喜好的动词：like, dislike, hate, appreciate 等。I hate it when people talk with their mouths full.I like it in the autumn when the weather is clear.Id appreciate
7、it if you would like to teach me how to use the computer.三、it 的几个特殊结构1. make it(1) 表示“成功、做到、赶上”The train is to leave in five minutes.We will never make it.3We cant make it to the other shore in cold weather.(2) 表示“确定时间”When shall we meet?Lets make it next Sunday.2. as it is(1) 用于句首，表示“事实上”I thought
8、he would get better, but as it is he is getting worse.(2) 用于句尾，表示“照原样”Leave the chair as it is.3. see (to it) that 注意、留神、负责、保证See to it that everything is ready.4. rely on it that信任、对。 。 。 。 。 。有信心You may rely on it that she wont be late.你可以放心，她不会迟到的。四、it 的几个特殊句型1. It is/was + 时间状语 + that 强调句It was
9、at seven oclock that I went to work yesterday.2. (1) It was + 时间点 + when 从句 （一般过去时 ）(2) It will be + 时间点 + when 从句 （一般现在时）It was 9 oclock when they arrived at the factory.【注意】这一句型中的时间只能是表示时间点的名词，前面不能有介词。It will be July 1 when we meet again.It is on July 1 that we will meet again.3. (1) It is/has bee
10、n + 时间段 +since 从句 （一般过去时）It is/has been three years since he joined the army.4(2) It was + 时间段 + since 从句 （过去完成时）It was three days since he had fallen ill.他生病已经有三天了。【注意】这一句型 since 从句中的谓语动词如果是延续性动词，则翻译成“不做某事多久了” 。It is years since I taught in this school.我离开这所学校已经几年了。It is years since I worked in tha
11、t factory.我不在那个工厂几年了。It is years since I lived in this city.我离开这个城市已经几年了。It is years since I enjoyed myself so much.我好几年没玩的这样痛快了。4.（1）It was + 时间段 +before 从句（一般过去时）It was three days before I knew the result.(2）It will be + 时间段 + before 从句（一般现在时）It will be three days before I know the result.【注意】 （1）
12、时态要一致，before 从句只有一般现在时和一般过去时两种时态。（2）翻译成“过多久才/就。 。 。 。 。 。 ”5. (1) It is the first time + that 从句（现在完成时）It is the first time that I have spoken in public.（2） It was the first time + that 从句（过去完成时）It was the first time that I had spoken in public.6 It is (high/about ) time + that 从句（一般过去时）Its time that I went to work.1=Its time that I should go to work.=Its time for me to go to work.
