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一、it作代词1．it的最基本用法是作代词，主要指刚提到的事物，以避免重复：Ningboisabeautifulcity,isn'tit?Theywatchedthetrainuntilitdisappearedinthedistance.2．也可以指动物或婴儿(未知性别的婴儿或孩子)。—Isthisyourdog？—No,itisn't.—It'sreallyacutebaby.3．也可指抽象事物。Itwasagreatsurprisetomewhenhedidathinglikethat.—Iwanttostay.—Yourfatherwon'tlikeit.4．it有时并不指具体的东西，而泛指天气、时间、日期、距离、价值、度量、温度、环境等，称为非人称的it。指天气：Itisalovelyday,isn'tit?指时间：Itwasnearlymidnightwhenshecameback.指环境：Itwasveryquietinthecafé.指距离：Itishalfanhour'swalktothecitycenter.指日期：What'sthedatetoday?It'stheeleventh,October.指季节：Itissummernow.指度量：Itisabout20pounds.指价值：—What'sthecostofthedictionary?—Itisthreedollars.指温度：It's35degreescentigradenow.SoIfeelhot.二、作形式主语替代主语从句、不定式或ving形式Itisveryclearthathe'sroundandtalllikeatree.＝Thathe'sroundandtalllikeatreeisveryclear.Itisimportantthatwe(should)learnEnglishwell.Itisimportantforhertocometotheparty.＝Itisimportantthatshe(should)cometotheparty.ItisnogoodlearningEnglishwithoutspeakingit.三、作形式宾语代替不定式、ving形式、宾语从句Wethinkitnecessarytosaveenergy.Wethinkitourdutytocleanourclassroomeveryday.Hehasmadeitclearthatwemusthandinourpapersattheendofthisweek.四、it用于强调句型Itis/was＋被强调部分＋that/who…强调句型中，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。Itwasanoldfriendofminethat/whoImetintheparkyesterday.Itisinthreedaysthathewillknowtheresult.ItwasatthetheatrethatLincolnwasmurdered.应用强调句型时应注意以下四点：1．句首词用“It”，不能用“This”，“That”等。2．be动词总用单数形式，即is或was，不能用复数形式are或were。3．连接词一般用that，当强调部分是人时，强调主语也可用who，强调宾语也可用whom或who。特别注意当强调部分是时间状语或地点状语时，不能用when或where。如：ItwasonOct.1st,1949thatthePeople'sRepublicofChinawasfounded.4．强调句不能强调句子的谓语部分。强调谓语动词时在动词原形前加助动词do,does,did，如：Iwishtogotoagooduniversity.Idowishtogotoagooduniversity.五、广东高考如何考it的用法it的用法在英语语法学习中是一个比较重要且常见的考点，主要可以体现在以下两方面：1．近四年广东高考语法填空中it的用法，只出现在2009年和2010年高考中。2009：Sherememberedhowdifficult______wastochooseasuitableChristmaspresentforherfather.【答案】it在宾语从句中作形式主语，真正的主语是tochoose…。但是含有it的用法的句子在考卷中随处可见。2010：Heaskedhisteacher,“Sir,thewaterwasawful.Whydidyoupretendtolike______？”【答案】it指代前面的内容water。2．在作文中恰当地应用含有it的用法的强调句型，可使文章的表达更恰当、地道，增加得分的亮点。比如2008年的基础写作题，里面提到“1968：第一次允许妇女参加奥运射击比赛。”我们就可以应用强调句型：Itwasin1968thatwomenwerefirstallowedtotakepartinshootingoftheOlympicGames。一、用it句型把A句转换为B句，意思基本不变。1．A.Tokeeporderinanimportantfootballmatchisahardjobforthepolice.B．________________________forthepolicetokeeporderinanimportantfootballmatch.2．A.TorecitethepassagesinNewConceptEnglishprovestobeaneffectivewayinEnglishstudy.B．_______________________________________torecitethepassagesinNewConceptEnglish.ItisahardjobItprovestobeaneffectivewayinEnglishstudy3．A.Whowilltakeustovisitthenatureparkhasn'tbeendecidedyet.B．________________________whowilltakeustovisitthenaturepark.4．A.Hegetsupearlyandrunsaroundtheplaygroundforhalfanhoureveryday.Hehasmadethatarule.B．Hehasmade______________________andrunaroundtheplaygroundforhalfanhoureveryday.Ithasn'tbeendecidedyetitaruletogetupearly5．A.Imeantthatyoumightgowithoutme,butIdidn'tmakethatclear.B．Ididn't______________________thatyoumightgowithoutme.6．A.Memorizing20Englishwordsadayiseasyforme.B．Ifind____________________20Englishwordsaday.makeitcleariteasytomemorize7．A.Afireisreportedtohavetakenplaceintheexperimentalbuildingthismorning.B．______________________afiretookplaceintheexperimentalbuildingthismorning.8．A.Ispenttwohourswritingtheessay.B．______________________towritetheessay.ItisreportedthatIttookmetwohours9．A.Theyseemtobequarrellingaboutsomething.B．______________________theyarequarrellingaboutsomething.10．A.Ihappenedtobeawayonbusinesswhenhecametovisitme.B．______________________Iwasawayonbusinesswhenhecametovisitme.Itseemsthat/asifIthappenedthat二、强调下列句子中的画线部分。1．Igotstuckinthetrafficjamandcamelatethismorning.2．Imissedmeetingmyuncleattheairportbecause_I_took_a_wrong_bus.ItwasIwhogotstuckinthetrafficjamandcamelatethismorning.ItwasIwhogotstuckinthetrafficjamandcamelatethismorning.3．Ididn'treceivethemanager'sreplyuntil_nearly_a_month_later.4．Ifoundmyhandbagin_the_dress_shop_where_I_bought_this_sweater.5．Idon'tknowwhereImethimbefore.Itwasn'tuntilnearlyamonthlaterthatIreceivedthemanager'sreply.ItwasinthedressshopwhereIboughtthissweaterthatIfoundmyhandbag.Idon'tknowwhereitwasthatImethimbefore.三、用it句式完成下列句子。1．Theboybecamefatterandfattereachdayand_______________________________.(这使得他父母很着急)2．Someoneisringingthedoorbell.Goandsee____________________.(是谁)3．____________(要不要紧)whetherhewouldbelieveinus?4．________________________(我想当然)thathecanfinishthejobintime.itmadehisparentsanxious/worriedwhoitisDoesitmatterItookitforgranted5．Wehavetobepatientbecause________________________________________.(还要一个星期我们才能得到最终结果)6．____________(已经有四年了)sinceIjoinedthearmy.7．________________________(这是第三次)thatyou'vearrivedlatethismonth.8．Hesaid,“____________________________(学校很远)．Thereisalongwaytogoyetbeforewearrive.”itwillbeaweekbeforewegetthefinalresultsItisfouryearsIt'sthethirdtimeIt'salongwaytoschool9．Shefinds____________________________.(待在家里很无聊)10．—Fewchildrenareasbrightasheis,andalso,heworksveryhard.—______________(难怪)thathealwaysgetsthefirstplaceinanyexamination.11．Nowthen,children._____