時(shí)間從句 的區(qū)別 完整解釋

1、It+時(shí)間+從句”考點(diǎn)透視請(qǐng)看下面一道題:The field research will take Joan and Paul about five months; it will be a long time _ we meet them again.A. after             B. before             C. since&#

2、160;                  D. when這是2007年安徽的一道高考題，其實(shí)質(zhì)上是通過“it + be+從句”這一句型來考查了連詞的用法。在該結(jié)構(gòu)中連詞的選擇是有規(guī)可循的，主要是由主句、從句中的謂語動(dòng)詞的時(shí)態(tài)來確定的。下面通過下表比較（尤其是對(duì)主從中時(shí)態(tài)的比較）就能很容易的掌握。結(jié)構(gòu)從句中謂語動(dòng)詞的形式含義例句It is +時(shí)間段+since從句一般過去時(shí)（到現(xiàn)在為止）做某事已有多長(zhǎng)時(shí)間了It is three yea

3、rs since the war broke out.It was+時(shí)間段+since從句過去完成時(shí)（到過去某時(shí)為止）做某事已有多長(zhǎng)時(shí)間了It was two years since he had left here.It was +時(shí)間段+before從句一般過去時(shí)過了多長(zhǎng)時(shí)間才It was a long time before I got to sleep again.It was not +時(shí)間段+before從句一般過去時(shí)沒過多長(zhǎng)時(shí)間就It wasnt long before he told me about this affairIt will be +時(shí)間段+before從句一般現(xiàn)

4、在時(shí)要過了多長(zhǎng)時(shí)間才It will be five years before we meet again.It will be not +時(shí)間段+before從句一般過去時(shí)沒過多長(zhǎng)時(shí)間就It wont three hours before he arrives at the bus stop.It is/was +時(shí)間點(diǎn)+when引導(dǎo)的定語從句 做某事的時(shí)間是什么時(shí)間It was eight oclock in the morning when he went shopping.It is/was+時(shí)間狀語+that引導(dǎo)的強(qiáng)調(diào)句 正是在某個(gè)時(shí)間，某事發(fā)生了It was at

5、 eight oclock in the morning that he went shopping.Its time that+從句一般過去時(shí)（或should+動(dòng)詞原形）是該做某事的時(shí)候了It is time that I went (should go) to pick up his daughter.It is the first/second/third time +that從句現(xiàn)在完成時(shí)某人第一/二/三次做It is my first time (that) I have visited the Great Wall.It/This/That was the first/second

6、/third time +that從句過去完成時(shí)某人第一/二/三次做It was the second time that the film had been shown in this cinema總結(jié)一 在" It +be+ 時(shí)間 + 從句"結(jié)構(gòu)中，引導(dǎo)從句的從屬連詞有 before, that, since, until （ till ） , when 等。這一結(jié)構(gòu)是近幾年高考?？嫉闹R(shí)點(diǎn)，現(xiàn)將它們的用法小結(jié)如下：1、 It +be （ not ） + 時(shí)間段 +before 從句。其中的主句是肯定式時(shí)，意為"過多長(zhǎng)時(shí)間才."；主句是否定式時(shí)，意為

7、"沒過多久就."。例如：1. It was not long before the whole country rose and drove the Austrian soldiers from their homeland. 2. It may be five or six years before the new medicine is tested on human beings.3. It was two months before he designed the bridge. 2、 It +will be （ was ） + 時(shí)間段 +until 從句 若主句中

8、用一般將來時(shí)，則從句中用一般現(xiàn)在時(shí)，意思是從現(xiàn)在起到從句中謂語動(dòng)詞表示的動(dòng)作發(fā)生時(shí)還有多長(zhǎng)時(shí)間；若主句中用一般過去時(shí)，則從句中也用一般過去時(shí)，意思是從過去某一時(shí)間起到從句中謂語動(dòng)詞表示的動(dòng)作發(fā)生還有多長(zhǎng)時(shí)間。例如：1. It will be ten days until my birthday comes. 2. It was only five minutes until her husband came back from work.注意：結(jié)構(gòu)"一"與結(jié)構(gòu)"二"在肯定句中幾乎可以通用。但是，若從句中謂語動(dòng)詞表示的將來動(dòng)作一定或預(yù)期肯定會(huì)發(fā)生，則多用

9、until 引導(dǎo)從句；若從句中謂語動(dòng)詞表示的將來動(dòng)作在客觀上并非一定要發(fā)生時(shí)，則多用 before 引導(dǎo)從句。3、 It +is / has been （ was ） + 時(shí)間段 +since 從句 在這一結(jié)構(gòu)中，主句常用一般現(xiàn)在時(shí)、現(xiàn)在完成時(shí)或一般過去時(shí)。如果 since 引導(dǎo)的狀語從句中的謂語動(dòng)詞為非延續(xù)性動(dòng)詞，則表示"自從狀語從句中的動(dòng)作發(fā)生以后，時(shí)間過不了多久"。例如：1. It is two years since Jim came to China. 2. It has been three years since they got married.如果 sin

10、ce 從句中的謂語動(dòng)詞為延續(xù)性動(dòng)詞，則表示"自從從句謂語動(dòng)詞表示的動(dòng)作結(jié)束以來，時(shí)間已過了多久"。例如：3. It is / has been a year since he smoked.4、 It +is / was + 時(shí)間點(diǎn) +when 從句 在這一結(jié)構(gòu)中，時(shí)間之前沒有介詞，從句為 when 引導(dǎo)的時(shí)間狀語從句。從句常用一般過去時(shí)，意為"當(dāng)某事發(fā)生時(shí)，時(shí)間是."。例如：1. It was October 1st, 1949 when the People's Republic of China was founded.2. What ti

11、me was it when you got to school?五 . It is /was + 時(shí)間狀語 +that 從句 這是一個(gè)強(qiáng)調(diào)句型，被強(qiáng)調(diào)的部分是時(shí)間狀語。表示"正是在某個(gè)時(shí)間，某事發(fā)生了"。例如1. It was ten years ago that he joined the army. 2. It was yesterday afternoon that I met him in the street.6、 It is / was +first time / second time + （ that ）從句 在這一結(jié)構(gòu)中， time 前面常用序數(shù)詞來修飾

12、， that 引導(dǎo)的是定語從句，從句中常用現(xiàn)在完成時(shí)態(tài)或過去完成時(shí)態(tài)，表示"這是第.次做某事"。例如：1. This is the first time in my life that I have come to Beijing.2. It was the third time that he had asked the same question. 7、 It is （ high ） time +that 從句 在這一結(jié)構(gòu)中， that 從句中的謂語動(dòng)詞常用虛擬語氣，即" should + 動(dòng)詞原形"或用動(dòng)詞的過去式，表示"該做某事了&qu

13、ot;。 例如：1. It is high time that we began our work. 2. It is time that he left the place.【鏈接訓(xùn)練】例1：Itisalmostfiveyears_wesaweachotherlasttime.(05北京) A.before B.since C.after D.when例2：-DidJackcomebackearlylastnight？ -Yes.Itwasnotyeteighto'clock_hearrivedhome. A.beforeB.whenC.thatD.until總結(jié)二這類考題出現(xiàn)頻率較

14、高，考生又極易混淆，在復(fù)習(xí)中做出歸類非常必要：1.Itis/hasbeen+時(shí)間段+since+一般過去時(shí) 例1：Itis/hasbeen10yearssincehecamehere.這類句型可轉(zhuǎn)化為： =Tenyearshaspassedsincehecamehere. 這一句型可擴(kuò)展為：Itwas+時(shí)間段+since(從句用過去完成時(shí)) 例2：ItwasyearssincehehadarrivedinChina.(過去是+since+過去完成時(shí)) 需要注意的是since從句的謂語動(dòng)詞一般是非延續(xù)性動(dòng)詞，但有時(shí)也可用延續(xù)性動(dòng)詞或表示狀態(tài)的詞，此時(shí)需要注意句子的翻譯：例3：Itisthreey

15、earssinceshecametoourclass. Itisthreeyearssinceshewasinourclass.2. It+was+時(shí)間點(diǎn)+whenclause(從句謂語用一般過去時(shí)) willbe+時(shí)間點(diǎn)+whenclause(從句謂語用一般現(xiàn)在時(shí)表將來)例1：Itwasalreadyeveningwhenhecameback.例2：Itwillbemiddaywhentheygethome.3. It+will(not)be+時(shí)間段+before+現(xiàn)在時(shí) was(not)+時(shí)間段+before+過去時(shí)例1：Itwillbeanotheryearbeforehecomeshe

16、re.例2：Itwassometime_werealizedthetruth.(2005山東24) A.whenB.untilC.sinceD.before該句型中before前常用時(shí)間段，表示".之后才.""在.之前就."有時(shí)before前也可以用時(shí)間點(diǎn)，此時(shí)突出表示動(dòng)作的變化。試比較：例3：ItwaseveningbeforewereachedthelittletownofTailstocks. 當(dāng)我們到達(dá)Tailstocks時(shí)已經(jīng)黑了。(到達(dá)前天還沒有黑)4. It/Thisis+the+序數(shù)詞+時(shí)間+定語從句(從句用完成時(shí))例1：Itisthef

17、irsttime(that)Ihavebeenhere.(定語從句) 該句型可擴(kuò)展為：Itwas+序數(shù)詞+時(shí)間+定語從句(從句用過去完成時(shí)) 例2：Itwasthesecondtimehehadbeenoutwithheralone.例3：It'sthesecondtimeyou_latethisweek. A.arriveB.arrivedC.have arrivedD.had arrived 5. Itis+(high)time+that+did(虛擬語氣) 例1：Itis(high)time(that)westoppedpollution. 其中that引導(dǎo)得從句中也可用shou

18、ld+V(原型)例2：Itis(high)time(that)youcame/shouldcomehere. 寫作中表示建議時(shí)也?？捎眠@類句型。例3：It'shightimewetookmeasurestosolvethisproblem.注意應(yīng)將以上5種句型與強(qiáng)調(diào)時(shí)間的強(qiáng)調(diào)句型的區(qū)別。6. Itbe+時(shí)間(被強(qiáng)調(diào)部分)+that例1：Itwasat6o'clockthatweheardthenoise.例2：Itwas3yearsagothathejoinedthearmy. 最簡(jiǎn)單的判斷方法是：當(dāng)表示時(shí)間的詞前有介詞或者后有副詞時(shí)，一定是強(qiáng)調(diào)結(jié)構(gòu)，必用that。 試比較下面

19、句式與強(qiáng)調(diào)句的不同之處： Itwasalreadyteno'clockwhenhearrived. ItistenyearssinceImetyoulast. Itwasquitesometimebeforehefoundtheelephantatall. 以上幾句中時(shí)間前無介詞后沒副詞故不是強(qiáng)調(diào)句型?！炬溄佑?xùn)練】1.Itwasnotuntil1936_basketballbecamearegularpartoftheOlympicGames. A.thatB.whenC.whichD.then2.Itwillnotbe_wemeetagain. A.longbefore B.befo

20、relong C.soonafter D.shortlyafter3.Hewasnearlydrownedonce. Whenwas_？ _wasin1998whenhewasinmiddleschool. A.that;ItB.this;ThisC.this;ItD.that;This4.Itwasevening_wereachedthelittletownofWinchester.(04天津) A.that B.until C.sinceD.before5.Scientistssayitmaybefiveorsixyears_itispossibletotestthismedicineon

21、humanpatients. A.sinceB.afterC.beforeD.when6.Itwas_ImetMr.SmithinLondon.A.manyyearsthatB.formanyyearssince C.sincemanyyearsagowhenD.manyyearsagothat7. -Whatwasthepartylike？ -Wonderful.It'syears_Ienjoyedmyselfsomuch.A. afterB.beforeC.whenD.since8. Itwasabout600yearsago_thefirstclockwithafaceandan

22、hourhandwasmade.A.thatB.untilC.beforeD.when9. I'm sorry you've been waiting so long, but it'll still be some time _ Brian get back. A. before B. since C. till D. After10.-DidJackcomebackearlylastnight？ -Yes.Itwasnotyeteighto'clock_hearrivedhome. A.beforeB.whenC.thatD.until總結(jié)三這類考題出現(xiàn)頻率

23、較高，考生又極易混淆，在復(fù)習(xí)中做出歸類非常必要：1. Itis/hasbeen+時(shí)間段+since+一般過去時(shí) 例如：Itis/hasbeen5yearssincehecameto our school. 這一句型可引申為：Itwas+時(shí)間段+since(從句用過去完成時(shí)) 如：Itwas10 yearssincehehadarrivedinChina. 需要注意的是since從句的謂語動(dòng)詞一般是非延續(xù)性動(dòng)詞，但有時(shí)也可用延續(xù)性動(dòng)詞或表示狀態(tài)的詞，此時(shí)需要注意句子的翻譯： 例如：Itisthreeyearssinceshecametoourclass. Itisthreeyearssinces

24、hewasinourclass.總之，在翻譯此類句子的時(shí)候我們要記住一點(diǎn)，那就是"自從這一動(dòng)作結(jié)束以來"，只要記住這一點(diǎn)我們就比較好理解句子了。2. It+was+時(shí)間點(diǎn)+whenclause(從句謂語用一般過去時(shí)) It willbe+時(shí)間點(diǎn)+whenclause(從句謂語用一般現(xiàn)在時(shí)表將來) 例如：Itwasalreadyeight o'clockwhenhecameback. Itwillbemiddaywhentheygethome. 3. It+will(not)be+時(shí)間段+before+現(xiàn)在時(shí) It was(not)+時(shí)間段+before+過去時(shí) 例如

25、：Itwillbeanotheryearbeforehecomeshere. Itwassometime_werealizedthetruth.(05山東24) A.whenB.untilC.sinceD.before 4. It/Thisis+the+序數(shù)詞+時(shí)間+that從句(從句用完成時(shí)) 例如：ItisthefirsttimethatIhavebeenhere. 該句型可引申為：Itwas+序數(shù)詞+時(shí)間+that從句(從句用過去完成時(shí)) 例如：Itwasthesecondtimethat hehadbeenoutwithheralone.5. Itis+(high)time+that+

26、did(虛擬語氣) 例如：Itis(high)time(that)westoppedpollution. 其中that引導(dǎo)得從句中也可用should+V(原型) 如：Itis(high)time(that)youcame/shouldcomehere. 寫作中表示建議時(shí)也?？捎眠@類句型。 如：It'shightimewebroke away from the bad habits and formed good ones. 注意應(yīng)將以上5種句型與強(qiáng)調(diào)時(shí)間的強(qiáng)調(diào)句型的區(qū)別：6. Itbe+時(shí)間(被強(qiáng)調(diào)部分)+that 如：Itwasat6o'clockthatweheardthe

27、noise.（強(qiáng)調(diào)句） Itwas3yearsagothathejoinedthearmy.（非強(qiáng)調(diào)句） 最簡(jiǎn)單的判斷方法是：當(dāng)表示時(shí)間的詞前有介詞或者后有副詞時(shí)，一定是強(qiáng)調(diào)結(jié)構(gòu)，必用that。 試比較下面句式與強(qiáng)調(diào)句的不同之處： Itwasalreadyteno'clockwhenhearrived. ItistenyearssinceImetyoulast. Itwasquitesometimebeforehefoundtheelephantatall. 以上幾句中時(shí)間前無介詞后沒副詞故不是強(qiáng)調(diào)句型?？偨Y(jié)四探究語法填空中"It be +時(shí)間+conj"句型 在各

28、類考試和歷屆高考試題中"it+be+time+conj"句型以不同的形式出現(xiàn),往往使同學(xué)們顧此失彼,一頭霧水,原因在于沒有搞清楚各個(gè)句型的特點(diǎn)及實(shí)質(zhì),現(xiàn)結(jié)合歷屆高考題分別予以探究。(一)It is +時(shí)間段+since+從句It has been +時(shí)間段+since+從句 此句型的要點(diǎn)：(1) 注意since前后句子時(shí)態(tài).since前的時(shí)態(tài)為is或has been,后的時(shí)態(tài)為一般過去時(shí)Eg: It is(has been) ten years since I joined the army 譯為:(2) since后的動(dòng)詞若為延續(xù)性或狀態(tài)性動(dòng)詞,應(yīng)譯為否定或相反,若為短暫

29、性動(dòng)詞按字面意思翻譯.Eg: It is(has been) ten years since I was a teacher =It is(has been) ten years since I left the army 譯為:.It is ten years since I smoked =It is ten years since I stopped smoking 譯為:【鏈接訓(xùn)練】:1、What was the party like？Wonderful. It's years_ I enjoyed myself so much A. after B.before C:when

30、 D:since2、 I live in Beijing now, that's to say, it's ten years since I _Beijing. A:lived in B:left for C:left D:was in3、 I'm a teacher now, that's to say, it is ten years since I_ a teacher. A: have been B: was C:became D:turned （2） It will be +時(shí)間段+before+一般現(xiàn)在時(shí)的從句 "要過多久/ 不久.才.&

31、quot; It was +時(shí)間段+before+一般過去時(shí)的從句 "過了多久才." "before"句型和"since"句型的共性都加時(shí)間段,差異在于前后的時(shí)態(tài)和翻譯。Eg: It will be ten years before I return home. 譯為: It was ten years before he found his lost boy. 譯為:【鏈接訓(xùn)練】:1、It is reported that it may be two or three months_it is possible to test this medicine on animals.A:since B:after C:before D:when2、 How long do you think it will be _ China sends a manned spaceship to the moon？ Perhaps two or th