it作形式主語與形式賓語

1、it作形式主語與形式賓語形式主語形式主語是動(dòng)詞不定式的一種,它也是邏輯主語, 可以把它歸類到邏輯主語的第一種(不定式的邏輯主語。用作賓語的不定式,用作目的狀語的不定式,用作結(jié)果狀語的不定式都是屬于不定式的大概念里面的。詳細(xì)用法綜述形式主語it作為形式主語的it并無實(shí)際語義,只是為滿足語法上的需要,避免句子頭重腳輕,它代替的是句子的邏輯主語,概括起來會(huì)有如下情況:句子的邏輯主語為不定式如:It is very kind of you to give me a hand in time.It is my pleasure to address the meeting.It was pretty h

2、ard for him to bring up the child on his own.句子的邏輯主語為從句如:It so happened that the tickets were sold out.It is extremely obvious that she has been lying about her identity.It suddenly occurred to me that the message must have been hidden between the layers of the briefcase.句子的邏輯主語為動(dòng)名詞短語這類句子遠(yuǎn)不如前面兩種出現(xiàn)率高

3、,主要在(no good, waste, useless, no use, dangerous等詞語的后面用。如:It is no use reasoning with him.It is no good reading in dim light.作形式主語的代詞只能用it,不能用that、this等詞。例如:1It is easier to lose friends than to make friends. 交朋友難而失去朋友比較容易。2It is important for modern young people to master at least two foreign langua

4、ges. 掌握至少兩門外語對(duì)于當(dāng)代年輕人來說是很重要的。以上兩句中的it是形式主語,真正的主語是后面的不定式短語。3It is considered no good reciting without understanding. 不理解的背誦被認(rèn)為是沒有好處的。4It is no use crying over spilt milk. 覆水難收。以上兩句中的it是形式主語,真正的主語是V-ing形式。5It is a fact that English is being accepted as an international language. 英語作為一門國際語言正日益為人們所接受,這是不

5、爭(zhēng)的事實(shí)。(it指代同位語從句6It depends on the weather whether we will go. 我們?nèi)ゲ蝗サ每刺鞖庑惺隆?其中的whether 不能換成if,因?yàn)閕f不能引導(dǎo)主語從句。以上兩句中真正的主語是名詞性從句。it 作形式主語主要用于下列三種情況不定式作真正主語主要用于下列句型:1. It + is/was + adj./n. +to do sth.A. 名詞作表語。主要有a pity, a pleasure, an idea等。例如:In fact is a hard job for the police to keep order in an impor

6、tant football match.A. thisB. thatC. thereD. it答案為D再如:It is a great pleasure to do this. 這樣做多好啊。It is a good idea to think this way. 這樣考慮問題是個(gè)好辦法。除be外,其他動(dòng)詞也有跟名詞的情況。例如:It seems a pity to waste the food. 浪費(fèi)這些食物真可惜。It requires efforts to master a foreign language. 掌握一門外語需要種種努力。B. 形容詞或形容詞短語作表語。分兩種情況:1下列形

7、容詞:kind, good, nice, clever, wrong, right, foolish, wise, unwise, stupid, rude, careless, cruel, brave, naughty, polite, selfish等詞作表語時(shí),不定式前?？杉右粋€(gè)由of引起的短語,來說明不定式指的是誰的情況。形容詞表示不定式邏輯主語的特征,即形容詞用來描述不定式行為者的性格、品行等。例如:It was foolish of you to leave school. 你中途退學(xué),真是傻瓜。It was brave of her to speak out in public

8、. 她能當(dāng)眾大聲講話,真勇敢。這種of sb. to do sth. 句型,of 的賓語可以作句子的主語。上面兩個(gè)句子可以改寫為: You were foolish to leave school.She was brave to speak out in public.2其他形容詞作表語,常見的形容詞有:necessary, hard, important, difficult, easy, possible, common等。例如:It is necessary to use a short-wave radio to pick up the programmers. 必須用短波收音機(jī)才能

9、收到節(jié)目。如果要說明不定式表示的動(dòng)作是誰做的,可以在不定式前加for + 名詞或代詞+ to do sth.(for 后的賓語不能作句子的主語。名詞或代詞作不定式的邏輯主語,即表示不定式所指動(dòng)作的執(zhí)行者。在此句型中,形容詞只對(duì)不定式行為者作某種描述,而不涉及其品行。例如:It is not hard for one to do a bit of good. 對(duì)于一個(gè)人來說做點(diǎn)好事并不難。It is common for leaves to fall from the trees in the fall. 秋天樹葉從樹上落下是件常事。需要注意的是:動(dòng)詞不定式作主語,一般情況下用it作形式主語,而

10、把動(dòng)詞不定式(從句放在后面。也可以直接用不定式作主語。例如:It is wrong to tell lies. = To tell lies is wrong. 撒謊是不對(duì)的。但在疑問句和感嘆句中,只能用it作形式主語。例如:Isn't it a good idea to have a walk around? 出去兜一圈難道不是一個(gè)好主意嗎?What a pleasure it is to work with you! 同你一起工作是多么愉快啊!2. It + v. + to do sth.動(dòng)詞不定式作主語時(shí)除動(dòng)詞be以外,動(dòng)詞take, cost, need, require, m

11、ake, sound, occur 等也可用it作形式主語,而把動(dòng)詞不定式放在后面。例如:It took us three years to complete the project. 我們花費(fèi)三年時(shí)間才完成了這項(xiàng)工程。It sounds reasonable to do it this way. 聽起來這樣做有道理。It needed hard work to finish the job. 要完成這項(xiàng)工作需要努力地工作。It didnt occur to me to ask him to help me. 我根本沒想到要找他幫忙。動(dòng)名詞作真正主語用于這種形式的是一些特定的形容詞和名詞。例如

12、:It was nice meeting you. 見到你真高興!(分別時(shí)用它與不定式作真正主語的區(qū)別在于,動(dòng)名詞說到的動(dòng)作已經(jīng)發(fā)生。例如:It is nice to meet you.(剛剛見面時(shí)用it 作形式主語,動(dòng)名詞作真正主語主要用于下列句型:It's +n. /adj. + doing sth.1下列形容詞后常用動(dòng)名詞作真正主語:nice, good, useless, hard, foolish, enjoyable, worthwhile等。例如:It is nice talking to you. 跟你交談?wù)媸怯淇?。It's foolish behaving l

13、ike that. 這樣的表現(xiàn)是很愚蠢的。It is useless doing that. 那樣做沒用。2下列名詞或名詞短語作表語時(shí)常用動(dòng)名詞作真正主語:use, good, fun, a waste of, job, task 等。例如:It's a waste of time doing this. 這樣做是浪費(fèi)時(shí)間的。It's no good (use doing that. 那樣做沒好處(沒用。It's an awful job doing this. 做這事真是一件可怕的差事。It's fun doing this. 做這事真有趣。It is not

14、 an easy task doing this work. 做這工作真非易事。名詞從句作真正主語用it 作形式主語的結(jié)構(gòu)主要用于下列句型:It +謂語+名詞從句(主語從句、表語從句、同位語從句1. It is +名詞+從句:這樣的名詞有a fact, a surprise, an honor(非常榮幸, a pity, common knowledge(常識(shí)等。例如:It is common knowledge that the full moon brings fair weather. 皓月兆天晴,這是常識(shí)。It is a surprise that you gave such an a

15、nswer to the question. 你對(duì)這個(gè)問題作了這樣的回答,令人吃驚。2. It is +形容詞+從句:這樣的形容詞有natural, true, strange, necessary, important, obvious(很明顯, certain, wonderful, funny, possible, likely, probable等。例如:It is certain that free medical care will be given to most people in our city. 我們城市的多數(shù)人將享受免費(fèi)醫(yī)療,這是一定的。It is probable t

16、hat he has known everything. 很可能他什么都已經(jīng)知道了。3. It +動(dòng)詞+從句:這樣的動(dòng)詞有seem, happen, appear, look, matter, make, strike, occur(突然想起等。It appeared that he had a taste for music. 看來他對(duì)音樂有一定的鑒賞力。It made us very happy that she was saved.她能化險(xiǎn)為夷令我們大家很高興。4. It + be + 分詞+從句:這樣的分詞有said(據(jù)說, reported(據(jù)報(bào)道, believed(人們相信, k

17、nown(眾所周知, decided(已決定, proved(已證實(shí), thought, expected, announced, arranged, amusing, puzzling, striking等。例如:It is said that Li Hao has been to Europe. 據(jù)說李郝去過歐洲。It was amusing that a rabbit ran out of the empty box on the desk. 桌上的空盒子里竟然跑出來一只兔子,太有趣了。需要說明的是,大部分連接詞引導(dǎo)的主語從句都可以用it充當(dāng)形式主語。例如:It remains unkn

18、own when they are going to get married. 他們何時(shí)結(jié)婚依然不明。It says in the newspaper that the enemy has been defeated. 報(bào)紙上報(bào)導(dǎo)敵人被打敗了。形式賓語概述形式主語和形式賓語通常用在不定式中,用it代替。形式主語的句子:it be adj./謂語+賓語+邏輯主語如It is useful to study English. 在這個(gè)句中真正的主語是后面的to do形式,it 叫形式主語。形式賓語的句子:主語+謂語+it+邏輯賓語如I think it interesting to dance. 真

19、正的賓語是to do形式,it叫形式賓語。形式主語和賓語的使用都是為了簡(jiǎn)化語句,讓別人一目了然。當(dāng)主語、賓語是很長(zhǎng)的從句、不定式、動(dòng)名詞時(shí)常用“形式主語”和“形式賓語”來替代,而真正的主語、賓語置于句末。之所以用it 代替是避免頭重腳輕。用法辨析1. 用“形式主語”的情況下,說明真正的主語(從句、不定式、動(dòng)名詞較長(zhǎng),用“形式主語”是比較符合英語習(xí)慣的。不用也可,但句子顯得頭重腳輕。如:That he won the game is true.不如It is true that he won the game.2. 在要用“形式賓語”的情況下,“形式賓語”是必須要用的。如:I find it h

20、ard to get along with her.不可把to get along with her放在find 和hard 之間。It作形式賓語的情況It 代替不定式短語作形式賓語1. He feels it his duty to help others. 他覺得幫助他人是他的責(zé)任。2. The new medicine makes it possible to treat this terrible disease. 這種新藥使治療這種可怕疾病成為可能。It 代替動(dòng)名詞短語作形式賓語1. We thought it no use doing that. 我們認(rèn)為那樣做無濟(jì)于事。2. Our teacher thinks it no good learning without practice. 我們的老師認(rèn)為光學(xué)不實(shí)踐是沒有好處的。It 代替賓語從句作形式賓語1. I think i