第9章 It句型
句型119：强调句型中的it
例句：It was John who lent me the book last night.
【★】：昨晚借书给我的是约翰。
【句型点拨】：这是it引导的强调句型。本句型的结构为“It＋be＋被强调部分＋that（who或whom）＋句子的其他部分”，用来强调句子中除谓语以外的其他成分，如主语、宾语、状语（时间状语、地点状语、原因状语、条件状语）和宾语补足语等。使用本句型时，如果强调的部分是人，用that/who/whom都可以；如果是时间、地点、物体等，一律用that。
强调主语：
It was Mary that/who cleaned the classroom yesterday.
★昨天打扫教室的是玛丽。
It was that unknown young American scientist who solved the complicated technical problem.
★正是那个不出名的美国年青科学家解决了这个复杂的技术问题。强调状语：
It was yesterday that Mary cleaned the classroom.
★玛丽是昨天打扫的教室。（时间状语）
It was not until last Friday that she finished that project.
★直到上周五她才完成那个项目。（时间状语）
It was not until I received your letter that I knew the truth.
★直到收到你的来信我才知道事情的真相。（时间状语）
It was not until he went to study in the United States that Li Hua really understood how poor his English was.
★直到李华到美国学习他才知道自己的英语有多差。（时间状语）
It was not until her mother came back that little Alice went to bed.
★直到妈妈回来，小爱丽丝才上床睡觉。（时间状语）
It is not until we lose our health that we realize the importance of it.
★直到失去健康我们才意识到它的重要性。（时间状语）
It was in the office that I met her father.
★我是在办公室遇见她爸爸的。（地点状语）
It was because of the heavy rain that he missed the train.
★因为暴雨他才错过了火车。（原因状语）
It is only under these conditions that a body experiences any acceleration.
★只有在这些情况下，物体速度才会增加。（条件状语）
强调宾语：
It was the classroom that Mary cleaned yesterday.
★玛丽昨天打扫的是教室。
It is Carl whom/that Tony is talking to over there.
★正在那边和托尼谈话的是卡尔。
It was Mary that John gave a handbag at Christmas.
★是玛丽在圣诞得到了约翰的手提包。
It was your sister that Tom met in the park yesterday.
★汤姆昨天在公园碰到的是你妹妹。
It is this type of change that chemists are chiefly concerned with.
★化学家要关心的正是这样一种变化。（介词宾语）
宾语补足语：
It is chairman of the committee that they elected him.
★他们选他做委员会的主席。
It was a pair of leather shoes that Father bought me.
★爸爸给我买的是一双皮鞋。
句型120：It is＋形容词＋动词不定式
例句：It is useful to know several foreign languages when you are traveling abroad.
【★】：在国外旅行时，懂几门外语很有用。
【句型点拨】：该句型中，it是形式主语，真正的主语是动词不定式。常用于本句型的形容词有useful，dangerous，easy，difficult，unusual，appropriate，absurd，impossible，depressing，hard，necessary，better，rewarding，futile，advisable，natural，essential，possible，wrong，preferable，important，advisable，good，inappropriate等。动词seem和feel也可以用于本句型。
It is dangerous to drive so fast in the highway in a rainy day.
★下雨天在高速公路上开这么快的车是很危险的。
It is very easy to yield to the temptation to sign for a lot of money.
★屈服于签收大笔钱款的诱惑是非常容易的。
It is very difficult to integrate yourself into a society whose culture is so different from your own.
★使自己与不同于自己文化的社会融为一体是很困难的。
It is unusual to see snow in this region in early spring.
★早春的时候，这个地区很少下雪。
It is appropriate to wear this evening dress to attend the party.
★穿这件晚礼服参加晚会很合适。
It is absurd to go out when it is raining dogs and cats.
★下着倾盆大雨的时候出去，太荒唐了。
It is impossible to speak too severely of his conduct.
★无论用怎样苛刻的言辞批评他的行为都不过分。
It is depressing to have someone always find fault with your work.
★总有人对你的工作挑错，这真令人沮丧。
It is hard to imagine a student focusing their energy on textbook while other children are playing.
★当别的孩子在玩耍的时候，很难想象一个学生能集中精力在课本上。
It is not necessary to wear suits on that occasion.
★没必要在那种场合穿西服。
It is better to nourish the children by feeding them good food.
★孩子只有吃得好才能长得好。
It is expecially rewarding to give praise in areas where effort generally goes unnoticed.
★对于通常不为人们注意的努力加以赞扬是特别有益的。
It is futile to discuss the matter further, because neither you nor I am going to agree upon anything today.
★进一步讨论这个事情是无益的，因为今天你我在任何事情上都不可能达成一致。
It is not advisable just to sit there brooding about the unpleasant bygones.
★老是坐在那里闷闷不乐地想着过去那些不愉快的事情并不好。
It is natural to feel tired after working in the factory for nearly twenty hours without any rest.
★在工厂工作了将近20个小时都不休息自然觉得累了。
It is essential to book tickets in advance if you really want to see the film Harry Potter.
★如果你真的想看哈利·波特这部电影的话，必须提前订票。
It is possible to cure AIDS and cancers in the near future.
★不久的将来艾滋病和癌症或许可以治好了。
It is wrong to cheat parents.
★欺骗父母是不对的。
It is preferable to go skiing in Switzerland in the winter.
★冬天的时候到瑞士滑雪更好。
It's very important to keep instrument dry in rainy days.
★下雨天保持仪器的干燥很重要。
It is advisable to wear a safety belt when you are driving.
★开车的时候最好系上安全带。
It feels good to stay outdoors in the summer night.
★夏天的夜晚呆在户外很舒服。
It seems inappropriate to speak loudly in the library when others are reading quietly.
★当其他人都在安静看书的时候在图书馆里大声说话，是不合适的。
句型121：It is/was＋形容词＋of＋名词／代词＋动词不定式
例句：It was very kind of you to look after me when I was ill.
【★】：感谢您在我生病的时候照顾我。
【句型点拨】：该句型中，it是形式主语，真正的主语是动词不定式短语。动词不定式的逻辑主语由of短语引出时，句型中所用的形容词一般都是表示人物的性格、品德、主观感情或态度的，比如kind，thoughtful，clever，brave，nice，wise，considerate，honest，modest，polite，sweet，foolish，stupid，cruel，naughty，careless，rude，selfish等。本句型通常用来对某人在某一具体场合所做的事情表示感谢、称赞或加以评论，译成汉语时常要加上“真是……”、“实在是……”、“太……”。
It is very thoughtful of you to buy me the English dictionary when you traveled abroad.
★您太费心了，到国外旅游还给我买了本英语词典！
It was clever of you to work out the difficult math problem.
★你真聪明，解决了这道数学难题。
It was brave of him to save the little girl from the burning car.
他真勇敢，从燃烧着的轿车里救出了小女孩。
It is nice of you to help me carry the box upstairs.
★非常感谢您帮我把箱子搬上楼。
It is wise of you to make that choice.
★你做出那样的选择是明智的。
It was considerate of Jane to bring her husband a raincoat.
★简对她丈夫很体贴，给他带来了雨衣。
It was honest of Tom to admit his mistakes.
★汤姆真诚实，承认了他的错误。
It is modest of the well-known writer to say he is just an ordinary old man.
★那位著名的作家很谦虚，说他只是一个普通的老人。
It was polite of him to hold the door for me when I entered the hotel.
★他真有礼貌，在我走进酒店的时候帮我扶住了门。
It is very sweet of you to send me the gift.
★你真好，给我寄来了礼物。
It is very foolish of him to believe the girl who always tells lies.
★他真笨，居然相信那个经常撒谎的女孩。
It was stupid of her to steal the money of the old man and was caught red-handed.
★她真蠢，偷那个老人的钱被当场抓住了。
It was cruel of him to starve his own father to death.
★他真残忍，居然把他亲爸饿死了。
It was very naughty of the little boy to push his father into the swimming pool.
★小男孩真调皮，把他爸爸推到游泳池里去了。
It was careless of him to lose the books borrowed from the library.
★他太粗心了，把从图书馆借来的书给弄丢了。
It is rude of you to do this to a lady.
★你太粗鲁了，居然对一位女士这样。
It was selfish of you to eat up all the food.
★你真自私，吃完了所有的食物。
句型122：It is/was＋形容词＋for＋名词／代词＋动词不定式
例句：It is impossible for us to finish all the assignments this week.
【★】：这周让我们完成所有的作业是不可能的。
【句型点拨】：该句型中，it是形式主语，真正的主语是动词不定式短语。介词for后面的名词或代词是动词不定式的逻辑主语。本句型常用的形容词通常都是表示重要性、紧迫性、频繁程度、难易、安全等情况的形容词，例如impossible，necessary，difficult，dangerous，important，safe，rare，appropriate，essential，hard，unusual，natural，easy，common，normal，pleasant等。除动词be外，动词seem和appear也可以用于本句型。
It is necessary for you to finish reading this book before the exam.
★考试前你必须把这本书看完。
It is difficult for me to climb up to the top of this high mountain.
★对我来说，要爬上这座高山的山顶是很难的。
It is very dangerous for the pupils to cross the busy street.
★让学生穿过繁忙的街道很危险。
It is very important for you to learn French well if you want to further your study in France after you graduate from the university.
★如果你想大学毕业后到法国深造，学好法语是很重要的。
It was safe for Robinson to hide in the cave at night.
★晚上，鲁宾逊躲在洞里很安全。
It was really rare for Mr Brown to blame his daughter for such a small mistake.
★为了一个小错误布朗先生就责备他的女儿，真是少见。
It was appropriate for you to take such actions after the incident.
★事故发生后你采取那样的措施，是很合适的。
It is essential for us to try to decide whether television is a blessing or a curse.
★我们有必要来评定电视到底是福还是祸。
It is hard for a person to recognize opportunities if he stays in one place.
★一个人要是总呆在一个地方，就难以意识到机遇。
It is not unusual for ballet dancers to wear out a pair of toe shoes during an evening's performance.
★芭蕾舞演员在一夜演出的时间里穿坏一双舞鞋是常有的事。
It is natural for ducks to swim and birds to fly.
★鸭子生来就会游水，鸟生来就会飞。
It is easy for us to go to Shanghai because we are now living in Suzhou.
★我们现在就住在苏州，因此要去上海很容易。
It is now very common for women to hold managerial jobs.
★现在妇女当上经理是很普遍的。
It was normal for Jack to get depressed after he lost his job.
★杰克失业后情绪低落，是很正常的。
It appeared unusual for the gentleman to shout at his beautiful young wife.
★那位绅士对他年轻貌美的妻子大喊大叫，这似乎很不平常。
It seemed hard for you to accept the result.
★你似乎很难接受这样的结果。
It seems pleasant for him to stay with the foreign teacher.
★和外教待在一起，他似乎很愉快。
句型123：It is＋形容词＋动名词
例句：It is useless talking to my father about it.
【★】：和我爸爸谈这件事情是没有用的。
【句型点拨】：该句型中，it是形式主语，真正的主语是动名词。常用于本句型的形容词有useless，worthwhile，nice，senseless，worth，wonderful，unexpected，funny等。
It is worthwhile spending so much money on books.
★花这么多钱买书是值得的。
It is nice meeting you.
★很高兴见到你。
It is senseless following the fashion all the time.
★时时刻刻都追赶潮流是毫无意义的。
It is worth giving rise to this question.
★值得提出这个问题。
It is well worth getting up so early to buy a ticket for the concert.
★为了买到一张音乐会的票起那么早，是很值得的。
It is wonderful fishing here.
★在这里钓鱼好极了。
It's quite unexpected his coming here.
★他到这里来出乎意料之外。
It sounds funny hearing your voice on a tape-recorder.
★你的声音从录音机里出来听起来很好笑。
句型124：It is＋名词＋动名词
例句：It is no use persuading him to give up smoking— hewon't listen.
【★】：想劝他戒烟，是没用的，他不会听的。
【句型点拨】：该句型中，it是形式主语，真正的主语是动名词。用于该句型的名词主要有no use，no good，no fun，fun，nuisance，a waste of time等。
It's no use employing radar to detect objects in water.
★用雷达探测水中目标行不通。
It is no good worrying about that now.
★现在为那担忧已没用了。
It is no fun watching the film on your own.
★你一个人看电影很没趣的
It is fun playing with the children in the park.
★在公园里和孩子们一起玩很开心。**
It's a nuisance having to get up that early on a Sunday morning.
★星期天早上要起那么早，真讨厌。**
It is just a waste of words talking to him.
★同他讲话只是白费口舌。**
It's a bore to little children having to go to school every day.
★对小孩子们来说，每天去上学真是一件烦人的事。**
It is no use learning the text by heart without understanding it.
★背书而不懂得意思是没有用的。**
It will be no good learning without practice.
★学习而不实践不好。**
句型125：It is/was＋名词＋动词不定式
例句：It is our great pleasure to note that our shipbuilding is developing vigorously.
【★】：我们很欣慰地看到，我国造船工业正在蓬勃发展。
【句型点拨】：该句型中，it是形式主语，动词不定式是真正的主语，名词（词组）主要表示说话人对不定式的评价或看法。常用于本句型的名词有pleasure，business，problem，insuit，brief，habit，job，duty，mistake，idea，shame，honour等。
It is the business of the police to prevent and detect crime and of the law courts to punish crime.
★防止及侦察犯罪是警察的职务而惩罚犯罪是法庭的职责。
It was a problem for her to get on the train with two children to be taken care of.
★要照料两个小孩，因此上车对她来说是个大问题。
It was an insult to tell your brother that he's stupid.
★对你弟弟说他很笨是对他的侮辱。
It is the minister's brief to ensure that the water supply will be improved.
★部长的指示是要确保改善供水状况。
It's her usual habit to break in with some ideas of her own.
★她常常打断别人的话来发表自己的观点。
It is an easy job to explain Newton's second law of motion.
★解释牛顿第二定律很容易。
It is our duty to help him do the work well.
★帮助他做好这项工作是我们的职责。
It is a mistake to think that robots will completely take the place of man.
★认为计算机将完全代替人类，那是错误的。
It is a good idea to camp at the beach.
★在海边来露营真是个好主意。
It is a shame to waste such talent—he would have become an excellent pianist if he had practiced more.
★浪费这么好的天赋真是太可惜了。他要是多加练习，可能会成为一个优秀的钢琴家。
It is a great honour to have the Premier here today.
★总理今天莅临，我们深感荣幸。
句型126：It is＋名词＋that从句
例句：It is common knowledge that bodies are lighter in water than (they are) in air.
【★】：物体在水中比在空气中轻，这是常识。
【句型点拨】：该句型中，it是形式主语，that引导的从句是真正的主语。That从句中的谓语动词有时用虚拟语气，that有时可以省略。
It was a mercy that she was not hurt in the accident.
★真幸运她没有在事故中受伤。
It was a great sorrow to his parents that he dropped out of college.
★他在上大学时中途退学，这使他的父母十分伤心。
It's a paradox that such a rich country has so many poor people living in it.
★如此富足的国家有那么多的穷人，这是一个矛盾的现象。
It's a tragedy that one lacks confidence in himself.
★一个人如果缺乏自信心，那就是悲剧。
It is a wonder that he remained alive after dropping from the roof of a twelve-storied building.
★他从12层高的房子的屋顶上摔下来仍然活着，这真是奇迹。
It is the law of nature that the old should give place to the new.
★新陈代谢是自然规律。
It is a pity that you did not go to see the film with us.
★你没和我们一起去看电影，真遗憾。
It's a shame (that) I haven't heard from her for so many years.
★真遗憾，我这么多年都没收到她的来信了。
It is a good thing that our manager has recovered after the operation.
★我们经理手术后已经康复了，这真是件好事。
It is no wonder that you can't sleep—you eat too much.
★难怪你会睡不着，你吃得太多了。
It's a fact that smoking may cause lung cancer.
★吸烟会导致肺癌，这是事实。
It is a matter of fact that Herbert is smarter than his twin brother Jesse.
★事实上，赫伯特比他的双胞胎弟弟杰西聪明。
句型127：It is＋形容词＋that从句（虚拟语气）
例句：It is essential that engineering students have a good knowledge of basic sciences.
【★】：工科学生掌握好基础科学的知识是极为重要的。
【句型点拨】：该句型中，it是形式主语，that从句是真正的主语。表示“必要的”、“应该的”、“必须的”、“迫切的”、“适当的”、“合适的”、“紧迫的”等含义的形容词用于该句型时，从句谓语动词使用should＋动词原形类虚拟语气，其中，should可以省略。用于该句型的形容词主要有essential，necessary，important，appropriate，imperative，natural，advisable，desirable等。
It is necessary that those machines should be lubricated regularly.
★那些机器必须经常上润滑油。
It is important that we realize the significance to protect the endangered animals on the earth.
★我们要意识到保护地球上的濒危动物的意义，这是很重要的。
It is certainly more appropriate that your daughter (should) read the simplified version of the English novel.
★你女儿读这部英语小说的简写本更为合适。
It is imperative that students hand in their term papers on time.
★学生们必须按时上交他们的学期论文。
It is natural that you should be nervous when you go to a new school.
★你到一所新学校读书时感到紧张不安是很正常的。
It is fitting that we should remember mother on her birthday.
★我们在妈妈生日那天送她礼物是恰当的。
It is advisable that you should begin to focus on your study as you have wasted so much time.
★你已经浪费了那么多时间了，最好现在开始专心学习。
It is desirable that you should be there by three o'clock tomorrow afternoon.
★希望你明天下午3点之前能到那里。
句型128：It is/was＋形容词＋that从句（非虚拟语气）
例句：It was apparent that he knew nothing about how to repair cars.
【★】：很明显，他一点儿也不知道怎样修理小汽车。
【句型点拨】：该句型中，it是形式主语，that从句是真正的主语。用于该句型的形容词主要有apparent，regrettable，annoying，surprising，clear，true，obvious，probable，funny，certain，indisputable，conceivable，amazing，possible，understandable，strange等。
It was regrettable that the local government used such secretive methods to deal with the matter.
★当地政府采取了如此隐秘的措施来处理此事，实在令人遗憾。
It is annoying that none of us know how to use the instrument.
★令人烦恼的是我们当中没有一个人知道怎样使用这种仪器。
It was surprising that her boss did not fire her when he heard the news.
★令人惊讶的是，她的老板听到消息后并没有解雇她。
It was hardly surprising that he was annoyed.
★他感到恼怒并不奇怪（是意料之中的事情）。
It is clear that numerical control is the operation of machine tools by numbers.
★显然，数控就是机床采用数字操纵。
It is true that the city can provide much convenience and entertainment, which is the very reason why people can't bear to part with city life.
★城市能够提供许多方便和娱乐，这是事实，也正是人们为什么不愿放弃城市生活的主要原因。
It was obvious that she had done her homework and thoroughly researched the background of her interviewees.
★很明显她做了大量的准备工作，并充分调查了被采访者的背景情况。
It seems probable that he has forgotten our appointment.
★可能他已经忘了我们的约会了。
It is funny that her two naughty sons are so quiet today.
★奇怪的是，她两个调皮捣蛋的儿子今天却那么安静。
It is now certain that there will be a contest in October.
★现在可以肯定，十月份将有一场比赛。
It is indisputable that boarding schools are exerting an increasingly important effect, especially in the last few years.
★不容置疑的是，寄宿学校正在发挥越来越重要的作用，尤其最近几年。
It is conceivable that knowledge plays an important role in our life.
★可想而知，知识在我们的一生中扮演着一个重要的角色。
It is likely that we'll have to do the experiment again.
★可能我们要重新做实验了。
It was amazing that the little boy was able to solve the problem so quickly.
★那个小男孩能这么快解完这道题，真是令人惊奇。
It is possible that Mr Wang will not accept the invitation.
★王先生有可能不接受邀请。
It was understandable that he flew into rage when he was told that the invaluable diamond had been stolen.
★他被告知那颗价值连城的钻石已被偷走时勃然大怒，这是可以理解的。
It's strange that you've never met him—he lives here!
★他就住在这里，你却从没见过他，真是不可思议。
句型129：It＋be＋动词过去分词＋从句（虚拟语气）
例句：It is desired that we should get everything ready for the meeting by tomorrow.
【★】：希望到明天我们可以将会议的一切准备好。
【句型点拨】：该句型中，it是形式主语，that从句是真正的主语。That从句的谓语动词用虚拟语气（should＋动词原形），should可省略。而且，主句的谓语常常使用表示“命令、要求、建议、请求、希望”等意思的动词，如desire，suggest，arrange，request，demand，require，decide，order，propose，command，recommend等。
It is suggested that the press conference should be put off.
★有人建议将记者招待会推迟。
It is arranged that the former CEO of the company give us a lecture this afternoon.
★已安排这家公司的前首席执行官今天下午给我们做报告。
It is requested that Miss Chen (should) sing a song at the party.
★有人请求陈小姐在晚会上唱一首歌。
It is demanded that nuclear weapons should be prohibited.
★人们要求禁止使用核武器。
It is required that all students should arrive at school at 8:00 o'clock tomorrow morning.
★要求所有学生明早8点到学校。
It was decided that three hospitals should close.
★已决定关闭3家医院。
It was ordered that the prisoner should be transferred to the county jail.
★命令将这名囚犯转至县监狱。
It was proposed that we build a bridge across the river.
★有人建议我们在河上建一座桥。
It is commanded that all troops cease fire.
★命令所有部队停火。
It was recommended that they should modify their work plan.
★有人建议他们修改工作计划。
句型130：It＋be＋动词过去分词＋that从句（非虚拟语气）
例句：It is generally accepted that smoking is harmful to our health.
【★】：人们普遍认为，吸烟有害健康。
【句型点拨】：该句型中，it为形式主语，真正的主语是that从句。本句型主要应用于科技文体和新闻文体。使用本句型时，通常不直接给出具体的说话者或动作的执行者。常用于本句型的动词有accept，report，hope，expect，learn，stress，state，predict，estimate，claim，acknowledge，say，think，note，believe等。
It was reported that 50 people were killed in the car accident which took place yesterday afternoon.
★据报道，在昨天下午发生的车祸中有50个人死亡。
It is hoped that the weather will improve tomorrow and we can go on with the sports meeting.
★希望明天的天气能有所好转，我们可以继续开运动会。
It is expected that the two countries will reach an agreement this afternoon.
★预计两国将在下午达成协议。
It is learned that Catherine has received the scholarship of Harvard University.
★据悉凯瑟琳已经获得哈佛大学的奖学金了。
It is stressed in the report that a balanced diet is extremely important to our health.
★报告强调均衡的饮食对我们的健康非常重要。
It is stated that the famous film star is a drug addict.
★据称那位著名的影星是位瘾君子。
It is predicted that the new financial policy will accelerate the economic growth.
★据预测，新的金融政策将加快经济的发展。
It is estimated that the painting is worth one million dollar.
★据估计，这幅画值100万美元。
It is claimed that Professor Wu is making a research on cloning.
★据称吴教授正在进行克隆方面的研究。
It is universally acknowledged that Albert Einstein is a great scientist.
★大家公认阿尔伯特·爱因斯坦是一位伟大的科学家。
It is often said that wide reading is the best alternative course of action but even here it is necessary to make some kinds of selection.
★人们常说，大量阅读是可供选择的最佳方案，但即使在这一方面，也需要某些选择。
It is commonly thought that our society has dramatically changed by modern science and technology, and human have made extraordinary progress in knowledge and technology over the recent decades.
★人们普遍认为我们的现代科技使我们的社会发生了巨大的变化，近几十年人类在科技方面取得了惊人的进步。
It is widely acknowledged that computer and other machines have become an indispensable part of our society, which makes our life and work more comfortable and less laborious.
★人们普遍认为计算机和其他机器已经成为我们社会必不可少的一部分，它们使我们的生活更舒适，减少了大量劳动。
It may be safely said that another earth satellite has been put into orbit.
★可以有把握地说，又有一颗地球卫星已被射入轨道。
It must be noted that learning must be done by a person himself.
★必须指出学习只能靠自己。
It is generally believed that China is still a developing country at present.
★人们普遍认为，中国目前仍是一个发展中国家。
句型131：SVOC句型中it作形式宾语
例句：Do you think it possible to finish the work in time?
【★】：你认为按时完成这工作可能吗？
【句型点拨】：动词不定式在SVOC（主语＋动词＋宾语＋补足语）结构中作宾语时，常常将不定式置于补足语之后。本句中，不定式to finish the work in time用作宾语，置于宾语补足语possible之后。
They thought it a great pity not to have invited her.
★他们认为没有邀请她很遗憾。
I'll leave it to you to buy the tickets.
★我让你去买票吧！
I owe it to myself to explain how it all happened.
★我要亲自解释事情是怎样发生的。
She took it into her head to go to Spain.
★她突然决定去西班牙。
The engineer found it impossible to schedule the project.
★工程师发现无法将该工程列入计划。
We don't think it necessary to argue him out of his opinion.
★我们觉得劝他放弃意见毫无必要。
I consider it better to buy an advanced PC.
★我考虑还是买一台高档个人电脑为好。
She thought it a pity not to have bought her only daughter a birthday gift.
★没有为女儿买生日礼物，她觉得很遗憾。
Do you think it possible for the electronic computer to replace man？
★你认为电子计算机能取代人类吗？
I find it difficult for them to finish the task within two days.
★我发现要他们在两天内完成这项任务很困难。
句型132：It＋不及物动词＋that从句
例句：It seems that no one knows what has happened in the park.
【★】：似乎没有人知道公园里发生了什么事情。
【句型点拨】：在该句型中，it是人称代词，并无实意，指的是某种情况，seems为系动词，that引导表语从句。常用于该句型的不及物动词有seem，happen，appear，strike，turn (out)，occur (to sb.)，stand (to reason)等。
It seemed that our English teacher was trying to teach us all he knew at the last lesson.
★我们的英语老师好像要在最后一堂课上把他的全部知识都教给我们。
It seems to me that Amanda is very happy with her new job.
★我看阿曼达很喜欢她的新工作。
It happened that I went shopping when my husband arrived home.
★我丈夫回到家时我刚好去购物了。
It happened that he came to see me that evening.
★碰巧那天晚上他来看我。
It appeared that the vice president was satisfied with the food served at the students' canteen.
★副校长似乎对学生餐厅的食物感到很满意。
It appears to them that Hannan is an ideal place for a holiday.
★在他们看来，海南是一个理想的度假的地方。
It struck me that I had left the briefcase in the taxi on my way to work.
★我突然想起上班的路上我把公文包落在出租车上了。
It turned out that she was elected mayor by a unanimous vote.
★结果她以全票当选市长。
It occurred to me that I haven't seen him for more than ten years.
★我想起我已经有十多年没见过他了。
It didn't occur to him that Sophia would refuse his proposal.
★他没有想到索菲亚会拒绝他的求婚。
It never occurred to her that her boyfriend might fall in love with her close friend Maria.
★她怎么也没想到她男朋友会爱上自己的密友玛丽亚。
It stands to reason that he won't accept the job if we don't offer him a reasonable salary.
★如果我们不给他合理的工资，他不会接受这份工作，这是合乎常理的。