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1、it的基本用法（1）用作人称代词，代替前文提到过的事物。Thetrainhasarrived.Itarrivedhalfanhourago.（2）用以代替提示代词this,that。—What’sthis?—It’saknife.—Whosewatchisthat?—It’smine.（3）起指示代词的作用，指一个人或事物。—Whoisknockingatthedoor?—It’sme.（4）指环境情况等。Itwasverynoisy(quiet)attheverymoment.（5）指时间、季节等。—Whattimeisit?—It’seighto’clock.Itoftenrainsinsummerhere.（6）指距离。Itisalongwaytotheschool.（7）作形式主语。Itisnoteasytofinishtheworkintwodays.Itisnousecryingoverspiltmilk.Itisaspitythatyoudidn’treadthebook.（8）作形式宾语。Ithinkitnousearguingwithhim.IfounditveryinterestingtostudyEnglish.Hemadeitclearthathewasnotinterestedinthatsubject.（9）用于强调结构。ItwasXiaomingwhom(that)Imetinthestreetlastnight.ItwasinthestreetthatImetXiaominglastnight.ItwasIwhometXiaominginthestreetlastnight.2、含有“Itis…”的句型（1）Itistime(forsb.)todosth.Itis(high)timethatsb.didsth.(虚拟语气)（2）Itis+形容词（+of/forsb.）+todosth.通常用of的词有brave、clever、careful、hopeless、kind、good、naughty、nice、silly、stupid、foolish、wise等。（3）Itis+形容词+that+sb.+(should)dosth.（虚拟语气）能用于这个句型的形容词有strange、wonderful、natural、good、proper、right、wrong、well、fortunate、important、necessary、useless、likely、probable、impossible等。有时可省去should而直接用动词原形。Itisimportantthatweshouldpaycloseattentiontograin.Itisnaturalthathe（should）sayso.（4）Itisnouse/good+doingsth.Itisnousetryingagain=Itisofnousetotryagain.（5）Itis+被强调部分+that/who+…Wasitinthestreetthatyoumether?Whowasitthatcalledhim“comrade”?ItwasnotuntilyesterdaythatImetmyoldfriend.Itisinasmallfactorythatmybrotherisgoingtowork.（注意上述各句均为强调句型的“考点”）比较：Itisasmallfactorywheremybrotherisgoingtowork.（定语从句）（6）Itissaid/reported/announced/(well)known…that…（7）Itis/was+时间+since…从……已多久了。ItisfivemonthssinceIarrivedinNewYork.我到纽约已经五个月了。ItisfivemonthssinceIwasinNewYork.我离开纽约已经五个月了。（注意：终止性动词表示从动作发生时算起；如果是状态动词或持续性动词，则从动作或状态结束时算起。）（8）Itis+时间+before…这个句型和上面句型中时间都是时间段，如long、years、months、weeks、fivedays、threehours、twentyminutes等。不过主句的时态多用一般将来时或一般过去时。Itwillbeseveralyearsbeforewemeetagain.我们要过好几年才能再见面。Itwasnotlongbeforetheysetoutforthefront.不久他们就出发去了前线。（9）Itis/was/willbethefirst/second/third…timethat…ItisthefirsttimethatIhavebeenhere.Itwasthesecondtimethathehadseenthefilm.（10）Itisuptosb.todosth…应由某人做某事。Itisuptoyoutodecidewhetherwestartornot.解析：答案为D。本题考查作形式主语的用法。that引导的从句是真正的主语。为避免头重脚轻而平衡句子结构，将it置于句首作形式主语。1._________isafactthatEnglishisbeingacceptedasaninternationallanguage.A.ThereB.ThisC.ThatD.It2.Ihopethereareenoughglasseforeachguesttohave________.A.itB.thoseC.themD.one解析：答案为D。本题考查替代词it和one的区别。it用于替代同类的、特定的、同一的事物；one替代同类的、泛指的人或物。根据题意“我希望有足够的杯子使每个客人有一个。”可知应用one泛指enoughglasses中的一个。3.Was__________thatIsawlastnightattheconcert?A.ityouB.notyouC.youD.thatyourself解析：答案为A。本题考查强调句型的疑问式。只须将句序变为陈述句便不难得出答案。