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被动语态、非谓语动词答辩

被动语态、非谓语动词答辩
被动语态、非谓语动词答辩

非谓语动词全面讲解

非謂语动词(一) 一、Done 被动性:过去分词的逻辑主语是分词动作的承受者(receiver), 而不是发出者,两者构成被动语态或被动意义。 完成性:与句中另一个动作、另一个时间或句子产生的时间相比,分词的动作已经发生、完成。 句法功能 表语:许多动词通过+ed 变成形容词,其本质是过去分词用作形容词The boys were astonished. The door remained locked. They seemed worried. 定语:划出下列句子的定语部分 The broken glass is still lying on the table. The frightened girl was trembling when the police arrived. A grown boy is a boy who has physically and mentally grown up. He sent them his newly-invented devices. She was reading a novel written by Dickens. The people trapped in the big fire were rescued by the firefighters with a helicopter. The radio bought in your shop doesn't work well. 翻译: 他是被经理测试的人员当中最优秀的员工之一。 宾补 1、在感官/ 感知动词后:see, look at, observe, hear, listen to, think, find, imagine, feel, watch等。 We found him greatly changed. 2、在使役动词后:make, have, get, keep, leave等。 He made himself understood in spoken English. 3、在意愿动词后:like, need, want, wish等。 She came into the shop with a package saying: I needn’t it changed but re-wrapped. 翻译:我回到家,发现家里被偷了

非谓语动词作宾补

非谓语动词作宾补 考点一感官动词see/ watch /observe/look at/hear/listen to/ notice等和使役动词have 后面的宾补。分两种情况: (一)当宾语与宾补存在逻辑上的主动关系时,动词原形 (省略to的不定式)表完成;doing表主动正在进行; (二)当宾语与宾补存在逻辑上的被动关系时,done与宾语 表示完成或没有一定的时间性;being done 表示正在进行。如: 1 I heard her sing an English song just now . 刚才我听到她唱 了一首英文歌。 2 I heard her singing an English song when I passed by her room yesterday . 昨天经过她房间时,我听到她在唱一首英文歌曲。 3 I heard an English song being sung when I passed by her room yesterday . 昨天经过她房间时,我听到她在唱一首英文歌曲。 4 I’d like to see my plan carried out . 我想看到这个计划被执行。 注意:不及物动词的过去分词表示完成或状态I looked down at my necklace and found my necklace gone . 对应练习: When I passed by the hall , I heard the clock ___ twelve . A strike B stuck C sticking D to strick 用动词的适当形式填空:At that moment I saw him ____________ (cross) the street . I was glad to see the children well ____________ (take) care of . 考点二let的复合结构:1 Let + 宾语+ do 让...做... 2 Let + 宾语+ be + done 让...被... 例如:Don’t let your child p lay with matches . Let the work be done immediately . 考点三leave 的复合结构,意为:使。。。处于某种状态 1 leave sb doing sth 让某人一直... (宾语与宾补之间是逻辑上的主动关系,表示动作正在进行) 2 leave sb to do sth 留下某人去做某事 (宾语与宾补之间是逻辑上的主动关系,不定式动作表将来) 3 leave sth to be done 留下某事要做 (宾语与宾补之间是逻辑上的被动关系,不定式表将来被动) 4 leave sth undone 留下某事未作( 宾语与宾补之间是逻辑上的被动关系, 表示被动和完成。常见的宾补动词有undone/unfinished/unsettled/untouched等) It’s wrong of you to leave the machine running He left , leaving me to do all the work . We hurriedly ended our meeting, leaving our problems to be settled . The guests left most of the dishes untouched, because they didn’t taste delicious .

非谓语动词用法归纳语法

非谓语动词用法归纳 一、表格的用法 1. doing 的用法 (1)在要求动词后(作宾语):avoid 避免appreciate 感激/欣赏acknowledge 承认/自 认admit 承认advocate 提倡/ 主张consider 考虑can't help 不禁can't stand 受不了contemplate 细想complete 完成confess 坦白dislike 不喜欢,讨厌deserve 值得delay 延迟deny 否认dread 可怕defer 拖延detest 嫌恶enjoy 享有/喜爱envy 嫉妒endure 忍受excuse 借口escape 逃跑/ 逃避finish 完成forgive 原谅fancy 幻想/ 爱好favor 造成/ 偏爱figure 描绘/ 计算hate 讨厌imagine 设想involve 卷入/ 包含keep 保持miss 错过mention 说到/ 讲到mind 介意pardon 原谅/ 饶恕permit 允许postpone 推迟practice 实行/实践prevent 阻止quit 放弃停止risk 冒险recall 回想resist 抵抗/ 阻止resume 恢复repent 悔悟resent 怨恨stand 坚持/ 忍受suggest 建议save 营救/ 储蓄tolerate 忍受

worth 值得 You should try to avoid making mistakes. The book is worth reading. The book deserves reading. (2)表进行 Walking on the grassland, I saw a snake.=When I was walking on the grassland, I saw a snake. The man speaking English is Tom. = The man who is speaking English is Tom. (3)表主动 The man speaking English is Tom = The man who speaks English is Tom. = The man who spoke English is Tom. Nobody dinks boiling water but boiled water.= Nobody dinks water that is boiling but the water that has boiled. (4)表伴随 I stand outside waiting for Mr. Chen. I lie in bed reading a novel. (5)表性质;特点 The film is very moving. She is understanding, so you had better discuss your business with her. 6)概括性, 一般性 Climbing mountain is very interesting.

高考英语高中英语语法之【非谓语动词】山东重点中学

第四章非谓语动词 第一节基本知识与基本概念 【什么是非谓语动词?】 用最庸俗的方式说,动词在使用中一般有六种形式:原形,单数第三人称形式,过去式形式,不定式形式,-ing形式,-ed形式。其中,前三种形式可以单独作谓语,而后三种则没有这个能力。如: I do the housework every morning. My wife never does anything at home. But she did it when we first got married. 以上三个句子就是很正确的英语。但是,如果把其中的谓语换成to do, doing, done就不成立了。这就是上面说的它们三个没有能力独立作谓语。其中,“独立”二字非常重要,因为,如果有其他词的帮助,就可以了。如: The Whites are planning to buy a third car. They have sold their house. 综上所述,所谓的非谓语动词指的就是动词的不定式形式,-ing形式,-ed形式等三种形式。与非谓语动词相关的考点也都将围绕着这三种形式展开。 【非谓语动词形式的基本特征】 一、不定式形式,-ing形式,-ed形式均没有“时”的标记。但不定式形式和-ing形式有“体”和“态”的特征。既前面二者有一般进行体、完成体和完成进行体之分;有主动态和被动态之分。-ed形式比较特殊,它既没有“时”的标记,也没有“体”和“态”的特征。 二、非谓语动词也有及物不及物之分;如果是及物动词又有单宾、双宾和复合宾语及物动词之分。因此,非谓语动词后面同样可以有补足成分。如: 跟补语:to feel thirsty getting cold 跟宾语:to do one’s work drinking wine 跟状语:to fly high eating carelessly 三、非谓语动词也有否定形式,即把否定词not直接置于其前。如: to do --- not to do doing --- not doing having done --- not having done 四、非谓语动词词组中的不定式和-ing形式在句子中可以起名词词组的作用。如: To teach is to learn twice. Drinking will not help you out of the trouble. He was accused of polluting the lake. 以上诸例中的to teach, to learn, drinking, polluting这些结构既有动词的意义,有起到了名词词组的作用。这样的功能在谓语动词形式(do, does, did)来说,是绝对没有的。这也是同学们经常在写作中犯的错误之一。-ed形式也没有这个功能。 五、非谓语动词形式可以起形容词的作用。如: drinking water smiling faces a frozen pond boiled eggs 【什么是逻辑主语和逻辑宾语】 逻辑主语和逻辑宾语是老师讲解非谓语动词相关知识经常提及的两个概念。它们是针对语法主语和语法宾语提出来的。从语法上讲,只有句子的谓语动词才有资格有自己的语法上的主语和语法上的宾语,就是我们平时所说的主语和宾语。如果该动词作的不是谓语动词,那

被动语态,非谓语动词练习

1.These model cars _____in China in 2013. A.are made B.were made C.make D.made 2. Over $30000_______for a children’s hospital by a British girl several moths ago. A.is raised B.was raised C.will be raised D.has been raised 3.Martin was so busy _____the old that he gave up his part –time job. A.helping B.helped C.to help D.help 4.The novel ____by many people today. A.is read B.are read C.reads D.were read 5.My parents didn’t allow me ____to the party. A.go B.to go C.goes D.went 6.I will try my best to stop my son from ______the same mistake. A.make B.made C.makes D.making 7.-How clean your car is! -Thank you.It ____very often. A. is washed B.washes C.was washed D.washed 8.Pukou Railway Station ______in 1911 and it has become a filming location for films and TV plays in recent years. A.build B.is built C.built D.was built 9/-What’s wrong with Simon? He isn’t at school today. -His legs hurt. He was____by a motorcycle this morning. A.treated B.hit C.operated D.cured 10.Sarah,you’d better drink more water after____for such a long time. A.run B.runs C.to run D.running 11.Many houses ____by the earthquake and thousands of people were left homeless. A.damaged B.were damaged C.were damaging D.are damaged 12.My time in the middle school was one of____periods of my life. A.exciting B.more exciting C.the more exciting D.the most exciting 13.Chengdu is a greener city now because more and more trees ____every spring. A.were planted B.are planted C.will be planted 14.It’s necessary for us ____to our parents when we have problems. A.to talk B.talking C.talk 15.-Don’t smoke here,Dad.Smoking_____in public places. -Oh,sorry. I’ll stop right now. A.isn’t allowed B.aren’t allowed C.doesn’t allow 16.So far,the AIIB(亚投行)_____57 countries to be the founding members. A.attracted B.has attracted C.will attract 17.When you_____a difficult task,try to continue with it and finish it. A.give B.are giving C.gave D.are given 18.Doing eye excercises ___one of the useful ways to protect our eyes. A.is B.are C.were 19.I wonder when Subway Ⅱin Harbin____.When the day comes,I’ll spend less time going to school every day. A.is finish B.will be finished C.was finished

非谓语动词作宾语补足语练习题

非谓语动词做宾补的练习题 用单词的适当形式填空: 1.Listen! Do you hear someone ___________(call)for help? 2. I was sleeping when I heard my name ____________(shout) 3.He’d seen us ____________(sit) by the lake all those times. 4. To his surprise, Jack found his son ________(dress) as Santa Claus on Christmas Eve. 5.You begin to understand how Chinese speakers have their thoughts ____________(organize), and how they understand things. 6. The patient was warned not __________(eat) oily food. 7.Jenny hopes that Mr. Smith will suggest a good way to have her written English ________________ (improve) in a short period. 8. The heartwarming story began in September last year when a woman asked the primary school in her neighborhood ____________(accept) her six-year-old son. 9.If you expect people ___________(give up) the habit of driving, we must give them another alternative(选择) 10.I like the film because it can make me_____________(laugh) 11.She kept me ____________(wait)over 10minutes. 12.with so many people_____________(look)at him,he felt very nervous. 13.with the problem__________(solve),the quality has been improved.

高中英语语法非谓语动词专项讲解

非谓语动词 一:基本形态及表达作用 1.一般式不定式(to)+ do 说明行为在谓语动词所表示的行为之后,多数是那些表愿望的词:want; hope; expect; wish 等。 I want to go home. I hope to see you. 说明行为与谓语动词表示的行为同时发生,多数是那些省略不定式符号的词,一般是复合宾语。 I saw him come in. He helped him (to) carry things. 2.一般式动名词 V-ing 表示动作与谓语动词表示的动作同时发出。 We enjoyed seeing the film. I am thinking of taking over the job. 在动词insist on; rely on; count on(相信)等后表示动作在谓语动词表示的动作之后发生。 He insisted on doing that work 在有些明确表示时间先后的动词和介词on; upon after代替完成动名词表示的动作在谓语动词表示的动作先发生。 I remember seeing him before. On arriving Beijing, he went to see his friend. 3.一般式分词 现在分词 v+ing 3.1.1持续性动词 说明分词表示的动作和句中谓语动词表示的动作同时发生。 He stood there speaking. Holding a book under his arm, he entered the room. 3.1.2终止性动词 说明分词表示的动作发生之后,句中谓语动词表示的动作立刻发生。 Entering the room, I found nobody in. Turning to the right, you will find the post office. 过去分词 3.2.1通常说明分词表示的动作,此句中谓语动词表示的动作先发生。 Written in simple English, the book is easy to read. I can't find my lost pen. 3.2.2说明分词表示的动作和句中谓语动词表示的动作并无先后。 He is a person well-known in this country. 3.2.3代替完成式现在分词的被动语态。 Educated by the party, he became a brave fighter. 4.完成式不定式 to+have done 说明行为动词在谓语动词表示的行为动词之前发生。 I'm sorry to have troubled you. He is said to have come here. He is thought to have done it. He is believed to have done it. He seemed to have known it. 在wish, hope, expect, intend, mean, suppose等动词过去时后,说明行为动词没有实现。We wished to have done this.

高考英语非谓语动词解析版汇编含解析

高考英语非谓语动词解析版汇编含解析 一、单项选择非谓语动词 1. ______ the difficult maths problem, I have consulted Professor Russell several times. A.Working out B.Worked out C.To work out D.Work out 【答案】C 【解析】 试题分析:考查非谓语动词的用法。句意:为了解出那道数学难题,我已经向Russell 教授 咨询过好几次了。非谓语动词中只有不定式可作目的状语,题干中缺少目的状语,故选C。 【知识拓展】不定式在句子中可作什么状语? 1) 目的状语。To?only to 仅( 仅为了), in order to, so as to, so(such) 如此??a以s 便to ??() 如:He ran so fast as to catch the first bus. 他飞快地跑以便赶上第一班车。I come here only to say good-bye to you. 我来仅仅是向你告别。 2) 作结果状语,表事先没有预料到的, 要放在句子后面。如:What have I said to make you angry ?我说什么让您生气了?He searched the room only to find nothing. 他搜查了房间什么也没找到。 3) 表原因。如:I'm sorry to hear your father is ill 听说你父亲病了很难过。考点:考查非谓语动词的用法。 【名师点睛】本题考查不定式作目的状语。本题与2014 年四川卷第7 题相似—Good idea.To find more about it, visit this website. 这里是动词不定式形式的非谓语动词做目的状语。 非谓语动词是高考的重要考点。一般现在分词表示主动的关系,而过去分词表示被动的关系,动词 不定式的用法很多,通常是跟在一个动词后面形成的固定结构,能够分辨出具体试题中的关系就可 以轻松解题。 2.The lecture mainly deals with the trouble young children have _____ right from wrong. A.distinguished B.distinguishing C.to distinguish D.to be distinguished 【答案】B 【解析】试题分析:首先have difficult /trouble doing sth 是固定词组。The lecture mainly deals with the trouble young children have distinguishing right from wrong 在这个句子中, deal with 的宾语是trouble ,所以后面的句子是修饰trouble 这个词的定语从句。 考点:固定用法考查点评:对于固定用法,平时一定要多归纳、总结和记忆。 3.Mrs. White showed her students some old maps _______ from the library

非谓语动词作补语讲解及练习

非谓语作补语 一.带to的不定式(to do )作宾补的动词 常见的有:ask, invite, tell, want, encourage, wish, expect, beg, request, require, advise, order, force, cause, allow, permit, forbid, warn, remind, teach, send, call on, wait for, would like / love / prefer等表示劝请、要求类动词后,用带to的不定式作宾补 1. My advisor encouraged ________ a summer course to improve my writing skills. (北京卷) A. for me taking B. me taking C. for me to take D. me to take 2. The teacher asked us ________ so much noise. (北京卷) A. don’t mak e B. not make C. not making D. not to make 3. The boy wanted to ride his bicycle in the street, but his mother told him ________. (全国卷) A. not to B. not to do C. not do it D. do not do 4. The patient was warned ________ oily food after the operation. (全国卷) A. to eat not B. eating not C. not to eat D. not eating 二. 在使役动词后作宾补的不定式不带to 在使役动词make, let, have后,一般用不带to的不定式作宾补,但在其被动式后作主语补足语时,要加上to。 1. Though he had often made his little sister ________, today he was made ________ by his little sister. A. cry, to cry B. crying, crying C. cry, cry D. to cry, cry 2. Paul doesn’t have to be made ________. He always works hard. (全国卷) A. learn B. to learn C. learned D. learning 三.在感官动词后作宾补的非谓语动词形式 感官动词feel, listen to, hear, see, look at, watch, notice,observe 等后面的宾语与作宾补的非谓语动词在逻辑上是主动关系时,用不带to的(在被动式后作主补时要加to)不定式(全过程)或者现在分词作宾补(正在发生),是被动关系是时,用过去分词作宾补 1. They knew her very well. They had seen her ________ up from childhood. (全国卷) A. grow B. grew C. was growing D. to grow 2. The missing boy were last seen ________ near the river. (全国卷) A. playing B. to be playing C. play D. to play 3. The managers discussed the plan that they would like to see ________ the next year. (全国卷) A. carried out B. carrying out C. carry out D. to carry out 四.其宾语后可用分词或不定式的3个动词 在want, get, have等动词的宾语后面可接现在分词、过去分词或动词不定式。现分述如下: ①want sb. doing希望某人做某事(多用于否定);want sb. to do要某人做某事;want sth. done=want sth. to be done(被动)。 I don’t wan t you arriving late. 我希望你不要迟到。(主动、否定句) I want the letter (to be) opened now. 我现在就想把这封信拆开。(被动) ②get sb. to do sth. 使某人做某事(主动、将来); get…doing使…开始做某事; get…done=have sth. done请人做/ 遭受(被动)。如: I’ll try to get her ________ the doctor. (上海卷) A. see B. seeing C. to see D. for seeing ③have sth. done=get sth. done请人做某事; have sb / sth. doing sth. 使某人/ 某物一直做某事或者处于某种状态;have sb. do sth. 使某人做某事(见使役动词);have sth. to do有事要做(见非谓语动词作定语部分)。 1. He didn’t keep on asking me the time any longer as he had had his wa tch ________. (上海卷) A. to repair B. repaired C.repairing D. repair

非谓语动词知识点总结

非谓语动词就是不能作句子谓语而具有其他语法功能的动词。 主语/表语: 不定式和ing分词均能作主语,二者有何区别? 1.表示某一具体的动作时,多用不定式;表示比较抽象的一般行为倾向的,多用动名词。 2.动名词作主语时通常位于句首;不定式作主语时常置于句末,用it作形式主语放在句首。 1) Smoking is prohibited(禁止)here. 2) It is not very good for you to smoke so much. Seeing is believing. To see is to believe. 若主语和表语都是非谓语动词, 应保持形式上的一致。

宾语: 1. 有些动词后只跟不定式作宾语,如: …… manage, promise, pretend, plan, offer, agree, ask, dare, choose, fail, help(帮助),want(想要) , refuse等。 决心学会想希望,拒绝设法愿假装。 主动答应选计划,同意请求帮一帮。 2. 有些动词后只跟动名词作宾语,如: ……practise, appreciate, dislike, excuse, forgive, keep, resist, risk, deny, advise, fancy, complete, forbid, permit, allow, stand, refer to, give up, lead to, take to, set about, get down to, object to, succeed in, have difficulty in... 考虑建议盼原谅,承认推迟没得想。 避免错过继续练,否认完成就欣赏。 禁止想象才冒险,不禁介意准逃亡。 3.有些动词如begin, start; love, like, hate, prefer后既可以跟不定式又可以跟ing分词作宾语,意义上无多大区别(但ing分词一般表示经常性的行为;不定式表示具体的行为)。 4.有些动词后既可以跟不定式,又可以跟动名词作宾语,但意义上有明显差别。go on (stop/remember/regret)to do/doing can’t help to do / doing try to do/ doing mean to do(打算)/ doing(意味)be used to do / doing ( get used to doing)(used to do) 5.动词need, require, want作“需要”,deserve作“应受,应得”,主动表被动 定语: 不定式、ing 分词和过去分词都可以作定语,主要区别在于它们的时态意义和语态意义。 分词作定语与动词不定式作定语的区别是:现在分词表示主动、进行之意;过去分词表示被动与完成;而不定式表示在谓语动词表示的动作之后即将发生的动作。 不定式用来修饰序数词、最高级或no, all, any等限定词的中心词,表主动关系。 E.g.: The car to be bought is for his sister. / He was the best man to do the job. The houses being built are for the teachers. Developing countries/ developed countries 补语: 1.能接带to的不定式作宾语补足语和主语补足语的动词有:ask, advise, tell, force, get, allow, want, wish, like, hate, prefer, intend,expect, encourage, persuade, permit, request,order, warn, cause等。 Think, consider, believe, suppose, feel等后常用“to be....”作补语。 E.g.: You are not allowed to smoke here. People considered him to be a great leader. 2.使役动词,感官动词接不带to 的不定式作宾语补足语。常见的使役动词有make, let, have等;感官动词有see, hear, watch, observe, notice, feel以及look at, listen to等。 ◆“吾看三室两厅一感觉”---5看(look at, see, watch, notice, observe)3使(make,

非谓语动词作宾语-宾补

非谓语动词作宾语,宾补 1、动词+doing 动+宾 enjoy doing sth. 喜欢做某事spend...doing sth. 花费…做某事 be busy doing sth. 忙于做…imagine sb. doing sth. 想象…做某事can't help doing sth. 忍不住做某事feel like doing sth. 想要做某finish doing sth. 完成做某事practice doing sth. 练习做某事miss doing sth. 错过做某事suggest doing sth. 建议做某事keep (on) doing sth. 保持(继续)做某事mind doing sth. 介意做某事be worth doing sth. 值得做某事consider doing sth. 考虑做某事 2、介词+doing 介+宾 ( be good at doing sth 擅长做某事be interested in doing sth.对做某事感兴趣insist on doing 坚持做某事put off doing 推迟做某事 be used for doing sth. 被用来做某事thank sb. for doing sth. 谢谢某人做某事be tired of doing sth. 厌烦做某事be afraid of doing sth. 害怕做某事stop sb. from doing sth. 阻止某人做某事give up doing sth. 放弃做某事without doing sth. 没有做某事think about doing sth. 考虑做某事What / How about doing 做某事怎么样look forward to doing sth. (盼望)pay attention to doing sth. (注意)be used to doing sth. (习惯于)prefer doing sth to doing sth.(更喜欢)devote to doing sth (致力于)make a contribution to doing (做贡献) ~ 3、动词+to do 动+宾,不定式作宾语 decide to do sth. 决定做某事want ∕would like to do sth. 想做某事plan to do sth. 计划做某事need to do sth. 需要做某事agree to do sth. 同意做某事afford to do 能做某事 be used to do 被用来做can’t wait to do 迫不及待地要做某事make up one’s mind to do 下决心做某事used to do 过去常常做某事 fail to do 失败做某事 4、常用带to 的不定式作宾语补足语 ask sb. to do sth. 请求某人做某事tell sb. to do sth. 命令某人做某事want sb. to do sth. 想要某人做某事invite sb. to do sth. 邀请某人做某事 ^ expect sb. to do sth. 期待某人做某事encourage sb. to do sth. 鼓励某人做某事

高中的英语非谓语动词讲解-(整理)

非谓语动词 非谓语动词包括不定式(to do)、动名词(-ing)、现在分词(-ing)与过去分词(-ed)。它们不受主语人称和数的限制,在句子中不能充当谓语,但可以充当句子的其他成分,并且有时态和语态的变化。 动词不定式

定义:动词不定式是非谓语动词的一种,它没有人称和数的变化,在句子中不能独立作谓语,但它仍保持动词的特点,可以有自己的宾语和状语。 一、不定式的意义 1. 不定式的一般式:一般式表示的动作或状态发生在谓语动词表示的动作或状态的同时或之后。当不定式的逻辑主语是这个不定式所表示的动作的承受者时,不定式一般要用被动式(to be done). eg: He seemed to be tired. The building to be finished next month is for our teachers. 2. 不定式的进行式:进行式表示动作正在进行,与谓语的动作同时发生。 . When I went to his home, he happened to be traveling around the world. 3. 不定式的完成式:如果不定式所表示的动作或状态发生在谓语动词所表示动作或状态之前,就用完成式;若是在此基础上的被动含义,就用完成被动式( to have been done).

. He is said to have written a novel about the Long March. He is said to have been taught French when he was a child. 4. 不定式的完成进行式:如果不定式的动作是在谓语所表示的时间之前一直在进行或有可能继续进行的动作,就要用完成进行式. eg: We’re happy to have been working with the experts all the month. 二、不定式的用法: 1. 不定式做主语:不定式做主语一般表示具体的某次动作。而动名词doing 表示习惯的,经常的动作。 1)不定式作主语时,谓语用单数 To do such things is foolish. 2)主系表结构 To see is to believe. 3)it形式主语。当主语较长,谓语较短时,常用it做形式主语,将不定式放到谓语的后面。 常用于下列结构中: (1)It is/was +adj.+(of sb.) to do…(如 good/ kind/ nice/ clever/ foolish/ selfish…) (2)It is +adj.+(for sb.)+to do…(如easy / difficult / hard / / unwise / possible/ necessary…) (3)It is +a/an +名词+ to do...(如a pity/ a shame / a pleasure /one’s duty / an honor …)

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