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1Itfollowsthat...结构︰Itfollows＋that-子句说明︰此句型意为“…那必然是真的；必然是…”。follow在此是benecessarilytrue（必然是真的）之意。“Itdoesn'tfollow＋that-子句”解释为“未必…”。Itfollowsthatthelongeryouwork,themoretiredyouwillbe.你工作得愈久，你愈会疲倦，那必然是真的。Itfollowsthatifyouworkhard,youwillsucceed.如果你努力，你就会成功，那必然是真的。Justbecauseheisatthebottomofhisclass,itdoesnotfollowthathehasabadbrain.只是因为他是班上的最后一名，那未必真的是他头脑不好。Fromthisevidence,itfollowsthatheisnotthemurderer.根据这一证据判断，他当然不可能是凶手。Althoughsheispoor,itdoesn'tfollowthatsheisdishonest.虽然她穷，却未必不诚实。Itoccurstosb.that...结构︰It＋occurto／strike＋sb＋to-不定词／that-子句说明︰此句型意为“某人突然想到某事…”。it是指that-子句，而that-子句有时用to-不定词；occurto指某事被想到，等于strike。Diditeveroccurtoyoutobebetrayedbyyourbestfriend?你可曾想到被你最好的朋友出卖？Itoccurredtohimthatheshouldgotoseeadentist.他想到他应该立刻去看牙医。2Doesiteveroccurtoyoutouseyoursighttoseeintotheinnernatureofafriendoracquaintance?你曾否想到用你的视觉去探视一位朋友或认识的人的内在本性？Itneveroccurredtometotakeadvantageofhim.我决没有想到过要占他的便宜。Ittakes(sb.)...to...结构︰Ittakes＋（sb.）＋时间＋to-不定词…说明︰此句型意为“做…需要／花了（某人）若干的时间”。It是虚主词。Ittookhimthreemonthstobeabletorunamile.要能跑一英里需要他三个月。Ittakeshalfanhourtowalkfromheretotheschool.从这里走到学校需要半小时。HowlongdoesittaketoflyfromheretoJapan?从这里飞到日本要多久？Ittakes...to...结构︰Ittakes＋条件＋to-不定词…说明︰此句型意为“从事…需要某条件”。It是虚主词。Ittakeshardworktoachievesuccess.成功需要努力工作。IttakespatienceandhardworktomasterEnglishwriting.学好英文写作需要耐心及努力。Ittakesalotofdoingtofinishthework.这工作很费事。Itcostssb....to...3结构︰Itcosts＋sb.＋金钱＋to-不定词…说明︰此句型意为“某人花多少金钱从事某事”。It是虚主词。Itcosthimagreatdealofmoneytotakethetrip.这趟旅行花了他不少钱。Itcostme100dollarstocollectthestamps.收集这些邮票花了我一百块钱。Howmuchdiditcostyoutostudyabroad?你出国深造花了多少钱？Itissaidthat...结构︰Itis＋过去分词（said／believed／expected／thought／reported／…）＋that-子句说明︰常用的此类句型有：“Itissaidthat…（据说…）”，“Itisbelievedthat…（一般相信）”，“Itisexpectedthat…（一般预料）”，“Itisthoughtthat…（一般认为…）”，“Itisreportedthat…（据报导…）”，“Itisestimatedthat…（据估计…）”，“Itisknownthat…（一般皆知…）”。ItisgenerallybelievedthatConfuciuspreservedtheliteratureofChinaforlatertimes.一般人都相信孔子为后世保存了中国的文学作品。Itisbelievedthathealthisabovewealth.一般人都相信健康重于财富。Itisgenerallybelievedthatitpaystoworkhard.一般人都相信努力是值得的。Itisreportedthatthecaraccidenttookplacesometimeyesterday.据报导，那场车祸是在昨天某个时候发生的。4Itisestimatedthatthedamagewasoveronemilliondollars.据估计，损失超过了一百万元。ItisexpectedthatJohnwillbebackbyten.约翰在十点以前回来是预料中的事。Itissaidthattheboygrewuptobeanotedscientist.据说那男孩长大后成了一位知名的科学家。Itisgenerallythoughtthattravelingabroadcanenrichone'sknowledge.一般认为出国旅游可增广见闻。Itseems/appears...结构︰Itseems／appears（tosb.）＋that-子句说明︰此句型意为“（在某人看来）似乎…”。appear和seem的字义及用法完全相同。ItseemstomenowthathesighedandthatItitteredtohidemyembarrassment.在我现在看来，他那时似乎在叹气，而我吃吃地笑是在隐藏我的尴尬。Itseemstomygrandfatherthatmyfatherisstillachild.在我祖父看来，我爸爸仍然是个小孩。Itseemsthattheworldisgettingsmallerandsmaller.似乎世界越变越小。Itappearstomethatyouareallmistaken.依我看，你们似乎都错了。Ithappensthat...结构︰Ithappens/chances+that-子句说明︰此句型意为“恰好…；碰巧…”。it做虚主词，代替that子句。5Ithappenedthatmymotherwasoutthatday.我母亲恰巧那天出去了。Ithappenedthathehadsomemoney.(=Hehappenedtohavesomemoney.)他刚好有带钱。Ithappened/chancedthatIwasbusywritingaletterwhenhecame.他来时，我正巧忙着写信。Itisapitythat...结构︰Itisapity＋that-子句／to-不定词说明︰此句型意为“…真是遗憾”。it做虚主词，代替that子句。Itisapity(that)helostsomuchmoney.他损失这么多钱，真是遗憾。Itisapitythatweshallhavetoleavetomorrow.我们明天必须离开，真是遗憾。Itisapitytogiveupthejob.要放弃这份工作，真是遗憾。Itisapitythatyoumissedtheparty.你未能参加聚会，真是遗憾。Itisjustaswellthat...结构︰Itisjustaswell＋that-子句说明︰此句型意为“还好”。it做虚主词，代替that子句。Itisjustaswellthatthenextdayisaholidaywhennoonehastowork.还好第二天没有人需要去工作。Itisjustaswellthatwedidnotfollowhim.还好我们没有跟着他。6Itisjustaswellthatyoutookanotherroad.还好你们走了另一条路。Itisone'sbeliefthat结构︰Itisone'sbelief＋that-子句说明︰此句型意为“某人相信…”。it做虚主词，代替that子句。Itishisbeliefthateducationshouldnotbetheprivilegeofalimitednumberofpeople.他相信，教育不应该是某一限定人数的特权。Itismybeliefthatgoodmannersareveryimportanttoeverybody.我相信礼貌对大家是很重要的。Itisourbeliefthateverybodyisequalbeforethelaw.我们相信法律面前人人平等。Itgoeswithoutsaying...结构︰Itgoeswithoutsaying＋that-子句说明︰此句型意为“不用说…”。相当于“Itisneedlesstosaythat…”。Itgoeswithoutsayingthatarealsportsmanwillneverdreamofcheatinginagame.不用说，一个真正的运动员绝不会梦想在比赛时作弊。Itgoeswithoutsayingthatmoneycannotbuyanything.不用说，金钱无法买到一切。Itgoeswithoutsayingthathomeisthewarmestplaceintheworld.不用说，家是世界上最温暖的地方。Howisitpossibleto...?结构︰Howisitpossible＋to-不定词／that-子句？7说明︰此句型意为“…这怎么可能呢？”。it是指“to-不定词”或“that-子句”。Howwasitpossibletowalkforanhourthroughthewoodsandseenothingworthyofnote?在树林中走了一个小时而没有见到什么值得注意的东西，这怎么可能呢?Howwasitpossibletofalldownfromthethirdfloorwithoutbeinghurt?从三楼掉下而没有受伤，这怎么可能呢？Howisitpossibleforaboyoftentoflyanairplane?一个十岁大的男孩会开飞机，这怎么可能呢？Itisagreatreliefto结构︰Itisagreatrelief+to-不定词...说明︰此句型意为“…是一大慰藉／真叫人松了一口气”。it是形式主词，代替“to-不定词”的内容。Itisagreatrelieftoallowusourselvestheluxuryofacknowledgingourhumanfrailties.让我们自己享受承认人类的弱点的快乐是一大慰藉。Itisagreatrelieftohaverainafteralongtimeofdrought.长期的干旱之后有雨是一大慰藉。Itisagreatrelieftoseehimstillasstrongashewas.看到他仍然像以前一样健康，真叫人安心。Itisworthwhileto...结构︰Itisworthwhile＋to-不定词词组说明︰此句型意为“做…是值得的”。worthwhile（不是worthwhile）是形容词，要与虚主词It并用。等于“Itpaysto...”。8Itisworthwhiletoreadthebook.读这本书是值得的。Itisworthwhiletotakeatripabroad.到