歷年高考單選題中常常出現(xiàn)It+be+時(shí)間+從句的這類(lèi)句型
例1：It is almost five years________we saw each other last time.(05北京)
A.before B.since C.after D.when
正確答案：B 我們已經(jīng)有5年沒(méi)見(jiàn)面了。
例2：-Did Jack come back early last night？
-Yes.It was not yet eight o‘clock________he arrived home.(2005福建24)
A.before B.when C.that D.until
正確答案：B 他回家時(shí)還不到8點(diǎn)。
這類(lèi)考題出現(xiàn)頻率較高，考生又極易混淆，在復(fù)習(xí)中做出歸類(lèi)非常必要：
1.It is/has been + 時(shí)間段 + since + 一般過(guò)去時(shí)
例1：It is/has been 10 years since he came here.這類(lèi)句型可轉(zhuǎn)化為：
=Ten years has passed since he came here.
這一句型可擴(kuò)展為：It was+時(shí)間段+since(從句用過(guò)去完成時(shí))
例2：It was years since he had arrived in China.(過(guò)去是+since+過(guò)去完成時(shí))
需要注意的是since從句的謂語(yǔ)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：It is three years since she came to our class.她來(lái)我們班已經(jīng)有三年了。
It is three years since she was in our class.她離開(kāi)我們班已經(jīng)有三年了。
2.It + was + 時(shí)間點(diǎn) + when clause(從句謂語(yǔ)用一般過(guò)去時(shí))
will be+時(shí)間點(diǎn)+when clause(從句謂語(yǔ)用一般現(xiàn)在時(shí)表將來(lái))
例1：It was already evening when he came back.當(dāng)他回家時(shí)已經(jīng)8點(diǎn)了。
例2：It will be midday when they get home.當(dāng)他們到家時(shí)將是中午。
3.It + will(not) be + 時(shí)間段 + before + 現(xiàn)在時(shí)
was(not)+時(shí)間段+before+過(guò)去時(shí)
例1：It will be another year before he comes here.
例2：It was some time______we realized the truth.(2005山東24)
A.when B.until C.since D.before
正確答案：D。過(guò)了一段時(shí)間后我們才了解了真相。
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：It was evening before we reached the little town of Tailstocks.
當(dāng)我們到達(dá)Tailstocks時(shí)已經(jīng)黑了。(到達(dá)前天還沒(méi)有黑)
4.It/This is + the + 序數(shù)詞 + 時(shí)間 + 定語(yǔ)從句(從句用完成時(shí))
例1：It is the first time (that) I have been here.(定語(yǔ)從句)
該句型可擴(kuò)展為：It was+序數(shù)詞+時(shí)間+定語(yǔ)從句(從句用過(guò)去完成時(shí))
例2：It was the second time he had been out with her alone.
例3：It’s the second time you________late this week.
A.arrive B.arrived C.havearrived D.hadarrived
正確答案：C。這是這個(gè)星期你第二次遲到了。
5.It is + (high)time + that + did(虛擬語(yǔ)氣)
例1：It is (high) time (that) we stopped pollution.
其中that引導(dǎo)得從句中也可用should+V(原型)
例2：It is (high) time (that) you came/should come here.
寫(xiě)作中表示建議時(shí)也?？捎眠@類(lèi)句型。
例3：It‘s high time we took measures to solve this problem.
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.It be + 時(shí)間(被強(qiáng)調(diào)部分) + that
例1：It was at 6 o’clock that we heard the noise.
例2：It was 3 years ago that he joined the army.
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：
It was already ten o‘clock when he arrived.
It is ten years since I met you last.
It was quite some time before he found the elephant at all.
以上幾句中時(shí)間前無(wú)介詞后沒(méi)副詞故不是強(qiáng)調(diào)句型。
《動(dòng)手練一練》：
1.It was not until 1936________basketball became a regular part of the Olympic Games.
A.that B.when C.which D.then
2.It will not be________we meet again.
A.long before B.before long
C.soon after D.shortly after
3.──He was nearly drowned once.(
──When was________？
──________was in 1998 when he was in middle school.
A.that;It B.this;This
C.this;It D.that;This
4.It was evening________we reached the little town of Winchester.(04天津)
A.that B.until C.since D.before
5.Scientists say it may be five or six years________it is possible to test this medicine on human patients.(04福建)
A.since B.after C.before D.when
6.It was______I met Mr.Smith in London.
A.many years that B.for many years since
C.since many years ago when D.many years ago that
7.-What was the party like？
-Wonderful.It‘s years_____I enjoyed myself so much.
A.after B.before C.when D.since
8.It was about 600 years ago___the first clock with a face and an hour hand was made.
A.that B.until C.before D.when
(Keys：AAADCDDA)
歷年高考單選題中常常出現(xiàn)It+be+時(shí)間+從句的這類(lèi)句型，先看幾道高考題：
例1： I’m sorry you’ve been waiting so long, but it’ll still be some time ____ Brian get back. (08年北京卷 34題)
A. before B. since C. till D. after
正確答案：A
例2：-Did Jack come back early last night？
-Yes.It was not yet eight o‘clock________he arrived home.(05福建24)
A.before B.when C.that D.until
正確答案：B
這類(lèi)考題出現(xiàn)頻率較高，考生又極易混淆，在復(fù)習(xí)中做出歸類(lèi)非常必要：
1.It is/has been + 時(shí)間段 + since + 一般過(guò)去時(shí)
如：It is/has been 5 years since he came to our school.
這一句型可引申為：It was+時(shí)間段+since(從句用過(guò)去完成時(shí))
如：It was 10 years since he had arrived in China.
需要注意的是since從句的謂語(yǔ)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：
如：It is three years since she came to our class.她來(lái)我們班已經(jīng)有三年了。
It is three years since she was in our class.她離開(kāi)我們班已經(jīng)有三年了。
總之，在翻譯此類(lèi)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(lái)”，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) + when clause(從句謂語(yǔ)用一般過(guò)去時(shí))
It will be+時(shí)間點(diǎn)+when clause(從句謂語(yǔ)用一般現(xiàn)在時(shí)表將來(lái))
如：It was already eight o'clock when he came back.
當(dāng)他回家時(shí)已經(jīng)8點(diǎn)了。
It will be midday when they get home.
當(dāng)他們到家時(shí)將是中午。
3.It + will(not) be + 時(shí)間段 + before + 現(xiàn)在時(shí)
It was(not)+時(shí)間段+before+過(guò)去時(shí)
如：It will be another year before he comes here.
It was some time______we realized the truth.(05山東24)
A.when B.until C.since D.before
正確答案：D。過(guò)了一段時(shí)間后我們才了解了真相。
4.It/This is + the + 序數(shù)詞 + 時(shí)間 + that從句(從句用完成時(shí))
如：It is the first time that I have been here.
該句型可引申為：It was+序數(shù)詞+時(shí)間+that從句(從句用過(guò)去完成時(shí))
如：It was the second time that he had been out with her alone.
5.It is + (high)time + that + did(虛擬語(yǔ)氣)
如：It is (high) time (that) we stopped pollution.
其中that引導(dǎo)得從句中也可用should+V(原型)
如：It is (high) time (that) you came/should come here.
寫(xiě)作中表示建議時(shí)也?？捎眠@類(lèi)句型。
如：It‘s high time we broke 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.It be + 時(shí)間(被強(qiáng)調(diào)部分) + that
如：It was at 6 o’clock that we heard the noise.（強(qiáng)調(diào)句）
It was 3 years ago that he joined the army.（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：
It was already ten o‘clock when he arrived.
It is ten years since I met you last.
It was quite some time before he found the elephant at all.
以上幾句中時(shí)間前無(wú)介詞后沒(méi)副詞故不是強(qiáng)調(diào)句型。
探究語(yǔ)法填空中“It be +時(shí)間+conj”句型
在各類(lèi)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(méi)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(guò)去時(shí)
Eg: It is(has been) ten years since I joined the army 譯為:我參軍已經(jīng)十年了.
(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:我復(fù)員十年了.
It is ten years since I smoked =It is ten years since I stopped smoking 譯為:我戒煙十年了.
練習(xí):
1、－What was the party like？
－Wonderful. It’s years____ I enjoyed myself so much
A: after B:before C:when D:since
2、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 in
3、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 Key.
【Keys：1、D 2、B 3、C】
（二）It will be +時(shí)間段+before+一般現(xiàn)在時(shí)的從句 “要過(guò)多久/ 不久…才…”
It was +時(shí)間段+before+一般過(guò)去時(shí)的從句 “過(guò)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: ① It will be ten years before I return home. 譯為:要過(guò)十年我才能回家.
② It was ten years before he found his lost boy. 譯為:過(guò)了十年他才找到了他失蹤的兒子.
練習(xí):
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:when
2、－How long do you think it will be ______ China sends a manned spaceship to the moon？
－Perhaps two or three years (2006.福建)
A:when B:until C:that D:before
3、How long do you think ____ the computer company brings out a new product？(2005.上海)
A: it will be before B:will it be until C:will it be when D: it will be that
【Keys:1、C 2、D 3、A】
（三）It will be+時(shí)間點(diǎn)+when+一般現(xiàn)在時(shí)的從句
It was +時(shí)間點(diǎn)+when+一般過(guò)去時(shí)的從句
與“before”句型比較:前后時(shí)態(tài)一致
與“since”、“before”句型強(qiáng)調(diào)的是時(shí)間段，而”when“句型強(qiáng)調(diào)的是時(shí)間點(diǎn)。
Eg: ① It will be midnight when I return home. 譯為:我回到家的時(shí)間將是午夜.
② It was noon when the accident happened 譯為:事故發(fā)生時(shí)已是正午.
練習(xí):
1、___ was 1979 ____ I graduated from university (1997.上海)
A:That; that B:It; that C:That; when D:It; when
2、It was breakfast _____ our teacher punished me (2004.北京)
A:when B: until C:since D: before
【Keys: 1、D 2、A】
(四)It is(was)+時(shí)間點(diǎn)+that的強(qiáng)調(diào)句型
強(qiáng)調(diào)句僅是形似，與“when”句型的比較很明顯：
1. 強(qiáng)調(diào)句時(shí)間點(diǎn)部分通常帶有介詞；
2. 去掉it is(was)……that之后，句子整合成一個(gè)完整的句子。
Eg:①I(mǎi)t was in the morning that I was robbed in the street. （刪除后還原：I was robbed in the street in the morning.）
=It was this morning that I was robbed in the street.
②It was at 7:00 that I met Tom this morning. （刪除后還原：I met Tom this morning at 7:00.）
=It was 7:00 when I met Tom this morning
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