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Itis句型1.Itis+被强调部分+that...该句型是强调句型。将被强调的部分放在前面，其它部分置于that之后。被强调部分可以是主语，宾语，表语或状语。强调的主语如果是人，that可以由who换用。如果把这种句型结构划掉后，应该是一个完整无缺的句子。这也是判断强调句型与其它从句的方法。Itwasabout600yearsagothatthefirstclockwithafaceandanhourhandwasmade.Itwastheythat(who)cleanedtheclassroomyesterday.ItwasinthestreetthatImetherfather.2.Itisnotuntil+被强调部分+that...该句型也是强调句型。主要用于强凋时间状语，译成汉语＂直到．．．才．．．＂，可以说是not...until...的强调形式。ItwasnotuntilshetookoffherdarkglassesthatIrealizedshewasafamousfilmstar.=NotuntilshetookoffherdarkglassesdidIrealizeshewasafamousfilmstar.=Ididn’trealizeshewasafamousfilmstaruntilshetookoffherdarkglasses.3.Itisclear(obvious,true,possible,certain....)that.....该句型中it是形式主语，真正的主语是that引导的主语从句，常译为＂清楚（显然，真的，肯定．．．）＂是主语从句最常见的一种结构。Itisveryclearthathe’sroundandtalllikeatree.=Thathe’sroundandtalllikeatreeisveryclear.4.Itisimportant(necessary,right,strange,natural...)that...该句型和上一个同属一个句型。由于主句中的形容词不同，that后的从句中要用虚拟语气（should+动词原形），should可以省去。建议记住该句型中的形容词。Itisimportantthatwe(should)learnEnglishwell.Itisnecessarythathe(should)rememberthesewords.5.Itissaid(reported,learned....)that...该句型中的it仍是形式主语，真正主语是that引导的主语从句。该结构常译为＂据说（据报道，据悉．．．）＂。ItissaidthathehascometoBeijing.Itisreportedthatanotherearthsatellitehasbeenputintoorbit.6.Itissuggested(ordered...)that...该句型和上一个同属一个句型。主句中的过去分词是表示请求，建议，命令等词时，that后的从句要用虚拟语气（should+动词原形），should可以省。常译为＂据建议；有命令．．．）Itissuggestedthatthemeeting(should)beputoff.Itwasorderedthatwe(should)arrivethereintwohours.7.Itisapity(ashame...)that...该句型中，that后的从句一般用虚拟语气（should+动词原形），should可省去．表示出乎意料，常译为＂竟然＂。没有这种意义时，则不用虚拟语气。Itisapitythatsuchathing(should)happeninyourclass.这种事竟然发生在你们班上，真是遗憾！Itisapitythatheisill.他生病了，真遗憾！8.Itistime(abouttime,hightime)that...该句型中that后的从句应该用虚拟语气，值得注意的是①常用过去时态表示虚拟．②有时也用should+动词原形，should不能省。常译为＂是（正是）．．．的时侯．．．＂。Itistimethatchildrenshouldgotobed.=Itistimethatchildrenwenttobed.9.Itisthefirst(second...)timethat...该句型要和上一个句型区别开来。该句型中的that从句不用虚拟语气，而用完成时态。至于用什么完成时态，由主句的谓语动词的时态决定。如果是一般现在时，后面从句用现在完成时态；如果是一般过去时，后面从句则用过去完成时态。该结构中that可以省去；it有时用this替换．常译为＂是第一（二）．．．次．．．＂。ItisthefirsttimeIhavebeenhere.=ThisisthefirsttimeIhavebeenhere.10.Itis....since...该句型主要用作处理瞬间动词的完成时，又要和表示一段时间的时间状语连用的问题。主句中是时间作表语，其时态是现在时或完成时，since引导的从句通常是一般过去时态，而且是瞬间动词。如果主句是一般过去时，从句则用过去完成时。Itis(hasbeen)5yearssincehisfatherdied.11.Itis...when...该句型中的when引导的是一个时间状语从句，主句中的it指时间，表语由具体的时间充当。常译为＂当．．．的时候，是．．．＂。Itwas5o’clockwhenhecamehere.12.Itbe...before...该句型主句中的it指时间,主句中的时态常是将来一般时或过去时两种时态．主句中的表语多是long,notlong,3days,2weeks等表示时间段的词或短语。常译为＂．．．之后．．．＂。Itwas3daysbeforehewenttoBeijing.Itwillbenotlongbeforehefinisheshisjob.13.Ithappens(seems,looks,appears)that...该句型中it是形式主语，that引导的是主语从句，主句中的happen,seem等词是不及物动词．Ithappened(sohappened)thathemethisteacherinthestreet.碰巧．．Itseemsthathewillbebackinafewdays.看来．．．14.Ittakessb....todosth.该句型中的不定式是真正的主语，it是形式主语，句型中的直接宾语是时间。常译为＂做．．．要花费某人．．．＂。IttookthousandsofpeoplemanyyearstobuildtheGreatWall.15.Itisnogood(use)doingsth.该句型中的真正主语是动名词短语，主句中的表语可以是nogood,(notanygood),nouse,(notanyuse)。ItisnogoodlearningEnglishwithoutspeakingEnglish.16.Itdoesn’tmatterwhether(if)...该句型中whether(if)引导的从句是真正主语，该句型常译为＂不论（是否）．．．没关系．．．。Itdoesn’tmatteriftheyareold.17.Itiskind(ofsb.)todosth.该句型中的不定式短语是真正主语，如果不定式的逻辑主语是由of引起，主句中的形容词必须是能表示逻辑主语特征的形容词。常见的有：bad,brave,careless,clever,cruel,foolish,good（好心的）,honest,horrible,kind,lazy,modest,naughty,nice（有教养的）,polite,rude,silly,stupid,wise,wrong（错误的）等。这个句型可以改写为：sb.iskindtodosth.Itiskindofyoutosayso.=Youarekindtosayso.18.Itisnecessary(forsb.)todosth.该句型与上一个同属一个句型。如果不定式的逻辑主语是由for引起，主句中的形容词通常是表示重要性，紧迫性，频繁程度，难易，安全等情况的形容词。常见的形容词有：①important,necessary,natural②easy,safe,common,normal,hard,difficult,dangerous,unusual,rare,impossible,pleasant等。在①中的形容词作表语可以用从句改写，如：Itisimportantforhertocometotheparty.=Itisimportantthatshe(should)cometotheparty19.Itlooks(seems)asif...该句型中it无意义。asif引导一个状语从句。常译为，＂看起来好象．．．＂如果与事实不相符合，则用虚拟语气．Itlooksasifheisill.（真的病了）Itlooksasifhewereill.（没有生病）Itseemedasifheweredying.20.Wethinkitimportanttolearnaforeignlanguage.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。Wethinkitourdutytocleanourclassroomeveryday.HefeltitimportantlearningEnglishwell.Theyfounditdifficultthattheywouldfinishtheirworkintwodays.1．It+被动语态+that…1)Itiswidelyrecognizedthatextensivedeforestationcontributedtoheavysummerflooding.（众所周知）2)Itisreportedthat800000applicantssatfortheNationalMaster’sEntranceTestin2003.（据报道）3)Itisestimatedthattwothirdsofthecitiesofourcountrywillbeinacuteshortageoffreshwaterby2010.（据估计）4)Itisgenerallyacceptedthattopracticeeuthanasiaonapatientwhoisstillaliveisinhuman.（人们普遍认为）5)Itmustbeadmittedthatthepricewarwilldisturbthenormalorderofthemarket.(必须承认)6)Itcannotbedeniedthattheovergrowthoftourismmaydestroytheecologicalbalanceofsomescenicresorts.（不可否认）7)Itisknowntoallthatphysicalexercisescanimproveandenrichourphysicalandmentalwell-being.（众所周知）8)Itgoeswithoutsayingthatouractualknowledgeofnaturallawsisstillimperfectandlimited.（毫无疑问）2．Itis+形容词+todosth/that…1)Itisobvious/evident/clear/apparentthatthesituationiscauseddirectly