It引起的几个易混淆的时间句型

1、It 引起的几个易混淆 的时间句型在 学 习 中 ， 同 学 生 们 对 “I t + be + 时 间 + 从 句 ” 这 个 结 构 经 常 混 淆 不 清 ， 下 面 逐 一 进 行 分 析1. . I t + be + 时 间 + si nce-cl ause自从 以来已多久这个句型表示从 since 从句谓语动作发生以后到现在或过去所经过的一段时间，意为了 ” ，主句多用一般现在时，从句用一般过去时，如果表示过去的情况，主句用一般过去时，从句用过去完成时或主句用过去完成时从句用一般过去时例如Itis threeyearssi nce his fatherpassedaway（从现在算

2、起）It was 10years si ncetheymarried（从过去算起）It hadbeen fifteen years sincesheleft Shanghai（从 过去算起）30 years has passedsince we joinedtheParty（从现在算起）从句用一般过去时，如果表示过去的情况，主句用一般过去时，从句用过去完2. I t + be + 时 间 + before-cl ause这个句型中的时间一般为表示一段时间的词语(如：long years , months , weeks , days ,hours , minutes ) ，主句中的谓语动词用肯

3、定式，意为 “过多长时间才 。主句的谓语动词是否定式时，意为” “没过多长时间就。主句的时态可用过去时was或将来时will be ；用was时，before从句的动词用一般过去时；用 willbe 时， before 从句常用一般现在 时。 例如 ：It was not long before she le arned those poems by heart . 她没过多久就背会了那些诗歌。It was long before the police arrived .过了很久警察才来。I t w i ll be hou rs before he makes a decisi on . 要

4、过 好 几 个 小 时 他 才 会 作 出 决定 。I t wi ll not be hours before meet again . 要不了 几 个小时 我 们还会 再 见 面的 。3. It + be + 时 间 + when-clause这句型中 , it 指时间，而且表示时间的词语前没有介词（ 时间一般为具体时间） 。主句中的谓语动词和从句中的谓语动词在时态上一般是一致的，主句是will be ， when 从句用一般现在时代替将来时。例如：It was already 8 o clockwhen we got homeIt was the next morni ngw hen we

5、 finishedour workIt willbemidnight whentheyget thereIt + be +时间that-clause这个句型是个强调句型例如It was twoyears agothat hemade animportant invention（原句是He m ade an i mportant i nvention two years agoIt was at 5 o cl ock that he practised playing the violi n in the morning（原句是Hepractised playingthe violin at 5

6、o clock inthe morning比较 ： It was 5oclock whenhestartedin the morni ng(5cl ock没有介词这是个定 语从句）It + be +timethat-clause这个句型属虚拟语气结构，不管主句中用的是原 型（但不及用过 去式普通）， 在 time 之 前有时可加上high 或 about 以加强语 气例如：is 或 was ， that 从句都须用动词的过去式或should + 动词It is time(that)we handed in our exercises .(= It is time that we should

7、hand in our exercises .)It is high ti me (that ) she wrote a letter to her boyfriend6. It / This / That + the first(second , third )time + that -cl a u s e这个句型表示截止到说话时为止的某人的一种经历，关键是注意 time 前有序数词，主句是is 时 ，从句要用现在完成时； 如果主 句用一般 过去时 was ， 则从句须相应地用过 去完成时。 例如：Th is is the fi rst time (that) these Europeans

8、 have v isited the Great Wal lIt was the fifth time (that) Ihad paid a friendly visit to AfricaIt代替从句作形式主语的常见句型it 代 替连词that引导的从句作形式主语1) it +be+ 过去分词+ that从句据说汤姆已经从国外回来了Its said that Tom has come back from abroadIt was reported that dozens of children died in the accident . 据报导，数十名儿童在事故中死亡。可用于该句型的过去分

9、词还有： known , thought , told , believed , hoped , announced ,expected , decidedsuggested 等，该句型常可以转换成含有宾语从句的复合句或者含有不定式作主补的简单句。如：It s said that Tom has come back from abroad .fPeople say that Tom has come back from abroad .have come backfrom abroad2) It + be +名词 词组+ that 从 句真遗憾，就他的年龄来讲，他竟不会游泳I t s a p

10、i ty t h at h e can t swi m f or hi s ag eIt s a wonder that you could finish such a hard task in such a short time . 真奇怪，你竟能在如此短的时间内完成可用于该句型的名词词组还有:an honour , a good thing , a fact , a surprise , good news 等。3)It +be /seem +形容 词 + that 从句It is likely that they willbeat us tonight .今晚很可 能他们会赢我们It d

11、oesnseem that she wi ll giveus a hand.她帮我们的可能性似乎不 太大可用于此句型的开容词还有;wonderful , true , good , right , wrong , (un)important ,useless , surprising , clear ,possible , unusuallucky , certai n 等4)It + seem/ appear /happen + that 从 句I t seems thathe enjoys pop songs very much.看来他非常喜欢流行歌曲It appears that Tom

12、might changehis mind .看来汤姆会 改变主意It happened that I went out that day .碰巧我那 天外 出 了He音意，句型4可转换 成含不定式的简单句如上述句子可转换为：seems to enjoy pop music very much ./ Tom appears to change hismind ./ I happened to go out that day.it 代替连接代 词或连接副词引导从句作形式主语1) It is known (not decided , not made clear , found out , disc

13、ussed , being discussed , being considered , a question ,certain连接代词或连接副词引导的从句Itisstill a question whenweshallhave our sports meet . 我们将什么时候举行运动会还是一个问题。Itisuncertain whetherhecanattend this conferenceor not . 他能否来开会还不能确定。2) It doesn t matter(doesnt matter too much , doesn t make to muchtdfeence连接副词引

14、导It doe sn t ma tter whe the r we go to gethe r or sep ara tely . 我们一起去还是分开去都可以。It doesnmt atter too much to me what you do or where you go .你做什么或去什么地方，对我都无关紧要。单元1.动脑能力ItTom s mother kepthe B答案与简析选 D1)体检测高考题tell ing him that he shouldwhich Cwor k harderbut di dn t helpshe D测试 it 用作 人称代词， 代 替 前文提到过的事

15、 物The lightinthe officeis sti llit又如：onA.Ohforgottu rni ng i t off B.tu r n i t of f C. to t u rn i t of f D.having turned it offave youheardthe news about TomA. is3 If youNowhatit B. itdon tknowlook at it B答案 1 3 CADis Cthe wordare they D. they arewhy don tyou in thedictionarylook after it Clook up

16、 it D. look it up值得注意的是，由动词和副词组成的短语动词用it 作宾语时， it 应置于动词和副词之Is necessaryto tellhis father everythingit Bthat Cwhat DheK答案与简析选A 。测试 it 用作形式主语，代替由不定式（或不定式复合结构、动名词或从句表示的动名词或从句表示的正主语又如1 I s possi ble tofly to themoonin a spaceshipnow Bman Cthat Dit2 Isnecessarytocompletethe designbeforeNationalDaythis Bt

17、hat Che Dit3 Doesmatterif he cantfinish the jobontimethis Bthat Che Dit4) It worrieda bitherhairwas tu rni nggreywhile Bthat Cif D. for答案1)4)DDDB3. I don t thi nk possi bletoma ster a fo rei g nla ng uag e wi t ho utm uc h me mo ry wo r kthis Bthat Cits Dit答案与简析选 D 。测试 it 用作形式宾语，代替由不定式、动名词或从句表示的真正宾语

18、。当宾语有自己的补足语时，用 it 作形式宾语，真正宾语放在补足语之后。常用这种句型的动词有think , make , find , feel ,consider等。4. Was itinthis palace the l ast em peror d iedthat Bin which Cin where D. whichK答案与简析选A 。测试it 用在强调结构中，为了强调句子的某一成分（通常是主语、宾语或状语），常用强调It is （was） +被强调成分 + that（或who）。被强调部分指人时用that 或 who ，在其它情况下 （包括强调时间或地点状语）用 that又如1 )

19、 Was it duringtheSecondWorldWar hediedthat Bwhich Cin which Dthen2)I t wa s no t sheto ok off her darkgla sses Ireal iz edsh e wa s a fa mo u s f il m sta rA. when ; that B. Until ; that C.unti l ; when D. when ; then答案1)2)BuasonlyhemanagerththsheK答案与简析选测试it可以用作指示代词，指人。当指人it 这样用时，所指的是心目中己知的或上下asWond

20、eaftK答案与简析选急，慢慢来)，fuerD。it ishappens that （碰巧）yearsnjoyselfit用在某固定短语或句型中。如eforebelieve it or not （ 信不信由你）, take it easy （ 别着(has been ) isince(某人干某事经过了多长一段时间)，It seems that （好象），It,It looks as if （好象），It is one' surn to do （该轮到谁干) 等。又如：T ak e itEverythingwi llbe fi ne i n aday or twoeasy Bquiet

21、Ccalm Dlight答案是7.It was Shanghaithe Communist Party ofChi na wasfoundedw herethat C. atwhichthat whereA 。测试强调句与定语从句不能混淆，这里是定语从句。若把Shanghai 的前面加上介词in时，就是强调地点，这时就可以选It精练40题1. T om s mot her kept tell ing h i m t hat he shou ld wor k harderbut di dnt helpAs BIt DThat DThishe Bwhichshe Dit2.was disappoi

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24、noon. PleasetellMrWangaboutthishatittheeinWhoisknockingatooAItBThatCThisDwhere15.eenthbactve16.asiswhhednmetoeetiatThefor Beijing University17. is good news that she has passed the entrance examinationis8.nooubtthallceed iiseri9.is0.suC.thatofD.that1.osantfndanyweresoI musuyoneititononthuseseowihout

25、prtiarniitearC.thatarngD.thattoea3.norobleouleadfo2 6. T om s m ot her kept tel l i ng h i m t hat h e sh ou l d wo rk harder , b ut d i dn t h el pA.heB.whichC.sheD.it27.The lightintheofficeis stillon.一Oh,Iforgot.A.turni ng itoff B.turn itoffC.to turn it offD.havingturnedit off28.Haveyouheardthe news aboutTom一No,whatA.is itB.it isC.are theyD. theyare9.Ifyou donknothe worwhydon tyothe dictonarooatitafteritC.ooupD.lookit0.faeryt1.posstospac2.ssarcompdesigforationalis3.oematerifhecafiniheonimthis Bthat Che Dit34It worriedbi