it的用法歸納

1、Never be afraid of grammarCollect some examples;Watch them very carefully;Find out something in common;Try to use the rules practise.it 用法完全歸納?一、it 作人稱代詞的用法1. 指事物作為人稱代詞， it 可以除人以外的一切事物或動(dòng)物。如：I dropped my watch and it broke. 壞了。我把手表掉在地上摔It s h ard work, but I enjoy it.工作很辛苦，可是我樂意干?！癢here is the dog ”

2、“It s in the bedroom. ” “狗 在哪”“在臥室里”。2. 指人it 指人主要用于指不性別不明的嬰兒或用于確認(rèn)某人的身 份。如：Is it a boy or a girl是男孩還是女孩There is a knock on the door. It must be the postman.有人在敲門，一定是郵遞員?！菊f明】 在答語中，常用來指本人，如說 It s me。3. 代替某些代詞代詞 it 還可用于代替指示代詞 this, that 以及復(fù)合不定 代詞 something, anything, nothing等。如：“Whats this ” “It s a new

3、 machine. ” “這是什 么”“是一種新機(jī)器”。Nothing is wrong, is it沒出什么問題，是嗎?二、it 作非人稱代詞的用法1. 基本用法it 作非人稱代詞的用法，主要用于指時(shí)間、距離、價(jià)值、天氣、氣候及溫度等自然現(xiàn)象。如：It s too late t o go there now. 現(xiàn)在去那兒已經(jīng)太遲了。It rained all day yesterday. 昨天下了一天的雨。It can get very hot here.這里有時(shí)會(huì)很熱。2. 用于某些句型It s time for sth.該做某事了。It s time to do sth.該做某事的時(shí)候了

4、。某人該干某事了It s time for sb to do sth.It s (about / high) time + that - 從句 . 某人該做某事 了。(從句謂語用過去式，有時(shí)也用“ should+動(dòng)詞原形”)It s first (second) time + that- 從句 . 某人第幾次干某事。 ( 從句謂語用現(xiàn)在完成時(shí) )It s +時(shí)間段+ since-從句.自從有一段時(shí)間了。It s +時(shí)間段+ before-從句.過多長的時(shí)間才?三、it 用作形式主語1. 基本用法當(dāng)不定式、動(dòng)名詞、從句等復(fù)雜成分用作句子主語時(shí)，為保 持句子平衡， 通常把真正的主語放在句末， 而在

5、句首使用形式主 語 it 。如：It s very important to r emember this. 記住這一點(diǎn)很 重要。It s hard work climbing mountains. 爬山是費(fèi)勁的事。It s unknown when he will come. 他什么時(shí)候來還不知 道。2. 用作形式主語的的重要句型(1) It + be + adj. for (of) sb to do sth 某人做某事他很難下定決It is hard for him to make up his mind.It was foolish of her to say such a thing.

6、她說那樣的話，真是太蠢了?！菊f明】介詞of與for的區(qū)別是：of用于指某人的性格、屬性、特征等，介詞for表示對象，意為“對來說” (from(2) It takes sb +時(shí)間段 + to do sth.某人做某事花了時(shí)間It takes years to master a new language.要花多年的時(shí)間才能掌握一門新的語言。【說明】此句型可以有以下多變種變體：It took mean hourto write the letter.=The letter took mean hour (to write).我寫這封信花了一個(gè)=I took an hour to write th

7、e letter.小時(shí)。(3) It is up to sb to do sth.該由某人做某事It s up to you to to make the choice.得由你來作選擇。(4) it look (seem, appear, happen, occur) that asif似乎It seemed as though he didn t recognize me. 他似乎 沒認(rèn)出我來。他打電話It happened that I was out when he called.時(shí)我碰巧不在家。(5) If it were not for /If ithadn t been for 若

8、不是因?yàn)镮f it were not for their help, we couldn t have gotover the difficulties.要不是他們幫助，這些困難我們不克服不了的。?四、it 用作形式賓語1. 基本用法當(dāng)不定式、 動(dòng)名詞、 從句等復(fù)雜成分用作賓語且其后跟有賓 語補(bǔ)足語時(shí)， 通常會(huì)在賓語補(bǔ)足語前使用形式賓語， 而將真正的 賓語移至句末。 其基本結(jié)構(gòu)為“動(dòng)詞 +it+ 賓語補(bǔ)足語 +不定式 (動(dòng) 名詞或從句 )”。如：I find it difficult to do the job well.我發(fā)現(xiàn)做好這件事不容易。I think it best that you

9、 should stay here.我認(rèn)為你最好住這兒。We think it no use complaining. 我們認(rèn)為抱怨是沒有用 的。2. 用作形式賓語的幾個(gè)特殊結(jié)構(gòu)(1) 動(dòng)詞+ it + that- 從句。如：I like it that you came.你來了，我很高興。我認(rèn)為他會(huì)準(zhǔn)你可以說I take it (that) he will come on time.時(shí)來的You can put it that it was arranged before.這是以前安排的。Rumorhas it that the defence minister will soon resi

10、gn. 據(jù)傳聞，國防部長不久就要辭職。【說明】 能用于此結(jié)構(gòu)的動(dòng)詞不多，常見的有 have, take, put, like 等。(2) 動(dòng)詞 + it + when (if)-從句。如：I dislike it whenyou whistle. 我不愛聽你吹口哨。 (from really appreciate it when she offered to help.她來幫忙了，我們十分感激。I d prefer it if I didn t have to do so much work.要是我不必做那么多工作，好就太好了。【說明】 能用于此結(jié)構(gòu)的動(dòng)詞不多， 常見的有 enjoy, hat

11、e, love, like, dislike, appreciate, prefer等。(3) 動(dòng)詞 + prep + it + that- 從句。如：See to it that youre not late again.注意千萬不要再遲到。Look to it that this doesnt happen again. 注意不要再發(fā)生這種事。You may rely on it that hell come t o meet you. 你 放心，他會(huì)來接你的。I can t answer for it that he will come.我不能保證他會(huì)來。 (from 【說明】 能用于此

12、結(jié)構(gòu)的動(dòng)詞不多，常見的有 see to, look to, insist on, stick to, depend on, answer for 等。(4) 動(dòng)詞 + it + 介詞短語 + that- 從句。如：I owe it to you that I am still alive.多虧有你我才仍然活著。I took it for granted that he would help us.我認(rèn)為他會(huì)幫助我們的。【說明】 能用于此結(jié)構(gòu)的動(dòng)詞不多，常見的有 take it for granted, bring it to sbs attention, owe it to sb等。It 的用

13、法練習(xí) 一單項(xiàng)選擇。it during the Second World War he diedwhich necessary to take off our shoes when we enter the labA. everyone3. Is possible to fly to the moon in a spaceship4. I don t think _ possible to master a foreign language without much memory work.heard of a terrible noise, _ brought her heart into

14、her mouth.6.Alice received an invitation from her boss, cameas a surprise. matter if he can t finish the job on times mother kept telling him that he should work harder, but didn t help.weather turned out to be very good, _ was more than we could expect.a fact that English is being accepted as an in

15、ternational language.hope there are enough glasses for each guest to havewas about 600 years ago_the first clock with a face and an hour hand was made.hate when people talk with their mouths full.was only when I reread his poems recently I beganto appreciate their beauty.is the ability to do the job

16、 matters not where youcome from or what you are. you that to blame.;is ; are ;are ;isI saw last night at the concert you you you electricity plays such an important part in our life is it that is itit is thatis thatwas he said disappointed me.;what ;that;that;whatwas in the lab _ was taken charge of

17、 by ProfessorHarris _ they did the experiment.; that; what; that; where二. 分析 it 成分，辨清相似句型。21. is well know to us all that the earth is round. is well known to us all, the earth is round.22. doesn t matter much whether he ll come to theparty. I feel an honour to be invited to speak here.23. _ no wond

18、er that he has passed the exam. _ no need for you to wait here.being wasis is24. Was it the house Abraham Lincoln was born Was it in the house Abraham Lincoln was bornA and B25. It s very kind you to help us.you to keep the It s very important balance of nature.Dwith .26. It is no good such a thing. It s of no importance suc