-it的用法及强调句型(精心整理)

1it的用法及强调句型it的用法一、it作指示代词【完成句子】用one，ones，it，that，those填空(1)—Ican'tfindmywatch.—Youhaven'tfound______？Ifyouwanttobuyanew______，Isuggestyoubuy______madeinChina.(2)We'vegotabigcupandtwosmall______.(3)Theweightofanelephantismuchgreaterthan______ofatiger.(4)Thebooksonthefirstshelfareeasierthan______onthesecondshelf.(5)Theboytoldhisstoryand______ofthegirlupstairs.【答案】(1)it;one;one(2)ones(3)that(4)those/theones(5)that/theone【结论1】①指代上文提过的事物时，it指的是同名同物，相当于the＋名词；②one指的是同名异物，表示单数可数名词相当于a＋名词；a/an＋形容词＋one等于a/an＋形容词＋名词；复数形式用ones；③that后面常有后置定语，有特指意义，代替不可数名词或单数可数名词，相当于the＋名词；④复数名词用those，相当于theones。【例句观察】—Someoneisknockingatthedoor.Whoisit?—ItmustbeLeo.Hesaidhe'dcometoseeme.【结论2】it指代人时，常指小孩或身份不明的人。【例句观察】It'stooquietintheroom.Everyonejustkeepssilent.【结论2】it可用以指代环境或情况。(6)—Whattimeisitnow?—It'shalfpastseven.(7)—Itisspringnowandit'swarmthesedays.【结论3】it可用以指代时间、季节、天气或距离。【注意】it指代时间时，有如下一些句型：(1)Itistimeforsth.(forsb.)todosth./that－从句(shoulddo/did,必须用虚拟语气)例：①It'stimeforlunch.②It'stimeforustocleanthehouse.③It'stimethatweshouldcleanthehouse.＝It'stimethatwecleanedthehouse.(2)Itis/hasbeen＋sometime＋since－从句(从句用一般过去时)Itis10yearssinceIgraduatedfromcollege.(3)It/This/Thatisthefirst/secondtimethat－从句(必须使用现在完成时)这是某人第……次做了某事。It/This/Thatwasthefirst/secondtimethat－从句(必须使用过去完成时)例：①ItisthesecondtimethatshehasvisitedtheGreatWall.②ThiswasthefirsttimethatIhadcomelatetoschool.(4)Itwas＋时间点＋when－从句例：Itwaseveningwhenwegothome.＝Itwaseveninginwhichwegothome.(5)Itwas/willbe＋sometime＋before－从句例：①过了5年他们才从北大毕业。ItwasfiveyearsbeforetheyfinallygraduatedfromBeijingUniversity.②不久，我们就要从我们学校毕业了。Itwon'tbelongbeforewegraduatefromourschool.二、it作形式主语1.代替主语从句①Itisclear(obvious，true，possiblecertain....)that.....“清楚（显然，真的，肯定．．．）”②.Itisimportant(necessary，right，strange，natural...)that...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.2③Itissaid(reported，learned....)that...据说（据报道，据悉．．．）“。ItissaidthathehascometoBeijing.④.Itissuggested(ordered/demanded/insisted/commanded...)that...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.⑤Itisapity(ashame...)that...that后的从句一般用虚拟语气（should+动词原形），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。Itisapitythatsuchathingshouldhappeninyourclass.Itisapitythatheisill.⑥Ithappens(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．．．Itdoesn’tmatterif/whethertheyareold.Itoccursto/strikessb.＋that-clause某人突然想到……Itsuddenlyoccurredto/struckmethatIhadn’tseenPeterallday.我突然想到，我一整天都没看见彼得。Howdiditcomeaboutthat－从句意为“……怎么发生的？”Howdiditcomeaboutthatheknewwherewewere?Howdiditcomeaboutthatsomanypeoplewereattacked?2.替代不定式①.Ittakessb....todosth.＂做．．．要花费某人．．＂IttookthousandsofpeoplemanyyearstobuildtheGreatWall.②.Itiskind(ofsb.)todosth.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，stupid，wisewrong等。这个句型可以改写为：sb.iskindtodosth.Itiskindofyoutosayso.=Youarekindtosayso.③.Itisnecessary(forsb.)todosth.常见的形容词有：①important，necessary，natural②easy，safe，common，normal，hard，difficult,dangerous，等。在①中的形容词作表语可以用从句改写，如：Itisimportantforhertocometotheparty.=Itisimportantthatshe(should)cometotheparty④Itisuptosb.todosth.“应由某人负责”或“……是某人的职责”。It’suptoyoutodecidewhethertotakethejobornot.接不接受这份工作由你自己定。3.作形式主语替代ing形式Itisnogood(use)/uselessdoingsth./It’snopleasuredoingsth./It’sawasteoftimedoingsth./Itisworthwhile＋doingsth./todosth.Itisworthwhilespending/tospendmuchtimeonit.在这件事上花时间是值得的。ItisnogoodlearningEnglishwithoutwritingEnglish.It'suselesstryingtoarguewithShylock.【结论】代替由不定式、动名词或从句所表示的真正主语。为平衡句子，通常把不定式作主语改为it作形式主语。三、it作形式宾语【例句观察】①Theyfounditdifficultthattheywouldfinishtheirworkintwodays②Shefeelsithardtogetintouchwithheroldfriend.③Mobilephonesmakeitpossibleforustokeepintouchanywhere.④Ihavemadeitaruletogetupearly.⑤Wethinkitourdutytocleanourclassroomeveryday..3【结论1】it作形式宾语常用结构有：代替由不定式、动名词或从句所表示的真正宾语。常见结构有：主语＋think/consider/find/feel/make/believe/regard＋it＋adj./n.(forsb.)todo./that从句【例句观察】IconsideritnogoodchattingwithstrangersthroughtheInternet.【结论2】主语＋think/consider/find/feel＋it＋nogood/usedoingsth.【例句观察】Ihateitwhenpeoplespeakwiththeirmouthsfull.【结论3】主语＋hate/dislike/love/like＋it＋when－从句，表对某一情况的喜好或厌恶。【例句观察】Ireallyappreciateitifyoucouldhelpmewithmymath.【结论4】主语＋appreciate＋it＋if－从句【例句观察】①Youmustseetoitthatthedoorsarelockedbeforeyouleavethelab.②Youcandependuponitthatwewon'tgiveup.③Ianswerforitthatsheisanhonestgirl.【结论5】主语＋seeto/answerforit＋that－从句(确保……)主语＋dependonit＋that－从句(指望，确信……)四、带it的一些固定词组1．(You've/I've)gotit.懂了，明白了2.Forgetit.算了吧，别在意，没关系。3.takeiteasy别着急，慢慢来；别过于紧张4.makeit办得到，做成功5.makeit＋时间把……定在(某时)6.It/That(all)depends.那要看情况而定。7.Itcan'tbehelped.没有办法。/这是不可避免的。8.Itishardtosay.情况很难说。9.Itcomestonothing.没有什么结果。10.Don'tmentionit.不用谢。11.That'sit.对了；正是。12.catchit(口语)被责骂；受处罚13.Believeitornot.信不信由你。14.Itdoesn'tmatter.没有关系；不要紧；15.Whenitcomesto(doing)sth.…当谈到……；当涉及……16.Keepitup.再接再厉。强调句型一、强调句型的基本用法1．强调句结构：Itis/was＋被强调部分＋that＋句子的其余部分。2．句型解读：(1)it是引导词，强调的内容可以是句子的主语、宾语、状