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It句型归纳总结I．It作形式主语的句型①It+be+adj(kind,wise,careless,clever…)+ofsbtodosthEg:Itiswiseofhimtomakesuchadecision.他做出这样的决定是明智的。②It+be+adj(easy,safe,common,normal…)+forsbtodosth该句型中adj若为important,necessary,natural,possible,strange,vital,essential等可改为从句,从句用should+动词原形。.Eg:It’sverydangerousforchildrentoplaywithfire.ItisimportantforustolearnEnglishwell.(=Itisimportantthatwe(should)learnEnglishwell.)③It+be+V-ed(reported,believed,said,suggested…)+that从句该句型中：⑴若V-ed为reported,believed,said等常译为“据报道”，“据认为”，“据说”。⑵若V-ed为suggested,ordered,demanded,insisted等表示“建议”,“命令”的词，从句要用虚拟语气(should)+动词原形。Eg:Itissuggestedthatthebook(should)berevised.It’ssaidthatTomhasbeenbackfromabroad.(=Tomissaidtohavebeenbackfromabroad.)④It+be+n(apity,ashame,afact,goodnews…)+that从句:?该句型中，从句一般用(should)+动词原形，表示出乎意料，常译为＂竟然＂。Eg:Itisapitythatsuchathing(should)happeninyourclass.这种事竟然发生在你们班上，真是遗憾！⑤Itisuseless/nouse/nogood/pleasure+doingsth此句型中的it是形式主语,其后的动名词短语是真正的主语,译为“做…没有用”。Eg:It‘suselessarguingwithhimfurther.//It’snousetalkingwithhim,becausehewon’tlisten.⑥Ittakessb....todosth.该句型中it是形式主语，真正的宾语是todosth，常译为＂做．．．要花费某人．．．＂。Eg:IttookthousandsofpeoplemanyyearstobuildtheGreatWall.II．It作形式宾语的句型1.sbfind/believe/think/feel/consider/make+it+n/adj+todo或从句该句型中的it作形式宾语。为了记忆方便我们可称该句型为“6123结构”。6指主句中常用的动词：think,believe,make,find,consider,feel；1指的是形式宾语it；2指的是宾补的两种形式：形容词或名词；3指的是真正宾语的三种形式：不定式短语，动名词短语或that引导的宾语从句。Eg:Wethinkitourdutytocleanourclassroomeveryday.HefeltitimportantlearningEnglishwell.Theyfounditdifficultthattheywouldfinishtheirworkintwodays.2.主语＋hate/dislike/love/like＋it＋when－从句Eg:Ihateitwhenpeoplespeakwiththeirmouthsfull.3.主语＋appreciate＋it＋if－从句Eg:Ireallyappreciateitifyoucouldhelpmewithmymath.4.sb.dependon/counton/relyon/seeto(负责，确保)/answerforitthat…Eg:Youmayrelyonitthathewon’tbelate.Youmustseetoitthatthedoorsarelockedbeforeyouleavethelab.5.sb.takeitforgrantedthat…认为……是理所当然的Eg:Itakeitforgrantedthathewillsucceed.III.It引导的时间句型⑴It+is/hasbeen+时间段+since引导的时间状语从句:?该句型中从句一般用过去时态，句意为“自从......以来已多久了”Eg:Itis5minutessincethebusleft.公汽开走已有5分钟了⑵It+be（will/was）+时间段+before引导的时间状语从句:该句型中，主句谓语动词be若为肯定式，意为“过多久才......”；若为否定式时，意为“没过多久就......”。Eg:Itwillbelong/3hoursbeforehecomesback.要过三个小时他才会回来Itwas3hoursbeforehecameback.过了三个小时他才回来⑶It+be+时间点+when引导的时间状语从句这个句型中,it代指时间，表示时间点的词前没有介词。Eg:ItwillbeMondaywhenhecomesback.他周一的时候回来.ItwasMondaywhenhecameback.他周一回来的.对比：ItwasonMondaythathecameback.(强调句)⑷It+is(about/high)time+?(that)sbdid/shoulddosth意为“该是某人做…的时候了”，about/high是用于加强语气，that从句用should或动词一般过去时表虚拟。亦可转换成It+is+time+(forsb)todosth.Eg:It’s(high/about)time(that)wehandedin/shouldhandinourhomework.⑸It/This/That+is+thefirst(second…)time+thatsbhasdonesth:意为“这是某人第…次做…”，注意time前有序数词，主句是is时，从句要用现在完成时；如果主句用was，则从句须用过去完成时。Eg:ItisthethirdtimethatIhaveseenthefilm.ThatwasthesecondtimethatIhavebeenthere.IV．It引导的强调句☆强调句形式：It+is/was+被强调的部分+that/who从句Eg:ItwaslastweekthatImetanoldfriendinthestreet.//Itwasbecausehewasillthathedidn'tcometoschoolyesterday.(强调原因状语从句时，只能强调由because所引导的从句.)☆判断方法：将Itis/was和that去掉，若该句是一个完整无缺的句子即为强调句.☆常考考点：①强调句型中的主谓一致Eg:Itisyou，ratherthanhe，thataretoblamefortheaccident．②插入从句的强调句型Eg:ItwasintherestaurantwherewehaddinnerlastSundaythatyouleftyourwallet．③强调句型的一般疑问句、特殊疑问句形式一般疑问句：Is/Wasit+被强调部分+that+句子其余部分?Eg:Wasitin1933thattheSecondWorldWarbrokeout?特殊疑问句：疑问词+be+it+that+句子其余部分?Eg:Whenwasitthathechangedhismindtotakepartintheactivity？④强调句型用于名词性从句,尤其注意要使用陈述语序。Eg:Idon’tknowwhenitwasthathechangedhismindtotakepartintheactivity？⑤notuntil用于强调句型Itis/wasnotuntil＋被强调部分＋that＋其他部分Eg:Itwasnotuntilmidnightthatshewentbackhome.此句型只用until，不用till。但如果不是强调句型，till和until可通用。因为句型中Itis/wasnot...已经是否定句了，that后面的从句要用肯定句。V．It其他常见用法：Itlooks/appearsasif...看起来好像……Itlooksasifsheisill.Itseemsthat...似乎……Itseemsthathewillbebackinafewdays.Itturnsoutthat...原来是……Itturnedoutthatthebeautifulwomanwasathief.Itoccursto/strikessbthat…突然想到……ItoccurredtomethatIhadn’tlockedthedoor.Ithappenedthat...碰巧……Ithappenedthathemethisteacherinthestreet.Itdoesn’tmatterwhether/if…无论是…没关系Itdoesn’tmatterwhetherhewillcomeornot.Itisnowonderthat难怪…Heworkssohard.It’snowonderhecouldpasstheexam.Howdiditcomeaboutthat…“……怎么发生的？”Howdiditcomeaboutthathisbikewasthrownintotheriver?Italldepends/thatalldepends.那得看情况It'suptosb.由……决定，由……负责，取决于……asitis(1)事实上，实际情况是……;(2)照原样makeit成功、做到、说定Believeitornot.信不信由你Getit明白了