完整版It+时间+从句的区别完整解释文档格式.docx
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过了多长时间才……
ItwasalongtimebeforeIgottosleepagain.
Itwasnot+时间段+before从句
没过多长时间就……
Itwasn’tlongbeforehetoldmeaboutthisaffair
Itwillbe+时间段+before从句
一般现在时
要过了多长时间才……
Itwillbefiveyearsbeforewemeetagain.
Itwillbenot+时间段+before从句
Itwon’tthreehoursbeforehearrivesatthebusstop.
Itis/was+时间点+when引导的定语从句
做某事的时间是什么时间
Itwaseighto’clockinthemorningwhenhewentshopping.
Itis/was+时间状语+that引导的强调句
正是在某个时间，某事发生了
Itwasateighto’clockinthemorningthathewentshopping.
It’stimethat+从句
一般过去时（或should+动词原形）
是该做某事的时候了
ItistimethatIwent（shouldgo）topickuphisdaughter.
Itisthefirst/second/thirdtime+that从句
现在完成时
某人第一/二/三次做……
Itismyfirsttime（that）IhavevisitedtheGreatWall.
It/This/Thatwasthefirst/second/thirdtime+that从句
Itwasthesecondtimethatthefilmhadbeenshowninthiscinema
总结一
在"
It+be+时间+从句"
结构中，引导从句的从属连词有before,that,since,until（till）,when等。
这一结构是近几年高考常考的知识点，现将它们的用法小结如下：
一、It+be（not）+时间段+before从句。
其中的主句是肯定式时，意为"
过多长时间才......"
；
主句是否定式时，意为"
没过多久就......"
。
例如：
1.ItwasnotlongbeforethewholecountryroseanddrovetheAustriansoldiersfromtheirhomeland.
2.Itmaybefiveorsixyearsbeforethenewmedicineistestedonhumanbeings.
3.Itwastwomonthsbeforehedesignedthebridge.
二、It+willbe（was）+时间段+until从句若主句中用一般将来时，则从句中用一般现在时，意思是从现在起到从句中谓语动词表示的动作发生时还有多长时间；
若主句中用一般过去时，则从句中也用一般过去时，意思是从过去某一时间起到从句中谓语动词表示的动作发生还有多长时间。
1.Itwillbetendaysuntilmybirthdaycomes.
2.Itwasonlyfiveminutesuntilherhusbandcamebackfromwork.
注意：
结构"
一"
与结构"
二"
在肯定句中几乎可以通用。
但是，若从句中谓语动词表示的将来动作一定或预期肯定会发生，则多用until引导从句；
若从句中谓语动词表示的将来动作在客观上并非一定要发生时，则多用before引导从句。
三、It+is/hasbeen（was）+时间段+since从句在这一结构中，主句常用一般现在时、现在完成时或一般过去时。
如果since引导的状语从句中的谓语动词为非延续性动词，则表示"
自从状语从句中的动作发生以后，时间过不了多久"
1.ItistwoyearssinceJimcametoChina.
2.Ithasbeenthreeyearssincetheygotmarried.
如果since从句中的谓语动词为延续性动词，则表示"
自从从句谓语动词表示的动作结束以来，时间已过了多久"
3.Itis/hasbeenayearsincehesmoked.
四、It+is/was+时间点+when从句在这一结构中，时间之前没有介词，从句为when引导的时间状语从句。
从句常用一般过去时，意为"
当某事发生时，时间是......"
1.ItwasOctober1st,1949whenthePeople'
sRepublicofChinawasfounded.
2.Whattimewasitwhenyougottoschool?
五.Itis/was+时间状语+that从句这是一个强调句型，被强调的部分是时间状语。
表示"
正是在某个时间，某事发生了"
例如1.Itwastenyearsagothathejoinedthearmy.
2.ItwasyesterdayafternoonthatImethiminthestreet.
六、Itis/was+firsttime/secondtime+（that）从句在这一结构中，time前面常用序数词来修饰，that引导的是定语从句，从句中常用现在完成时态或过去完成时态，表示"
这是第......次做某事"
1.ThisisthefirsttimeinmylifethatIhavecometoBeijing.
2.Itwasthethirdtimethathehadaskedthesamequestion.
七、Itis（high）time+that从句在这一结构中，that从句中的谓语动词常用虚拟语气，即"
should+动词原形"
或用动词的过去式，表示"
该做某事了"
例如：
1.Itishightimethatwebeganourwork.
2.Itistimethathelefttheplace.
【链接训练】
例1：
It is almost five years_____we saw each other last time.（05北京）
A.beforeB.since C.after D.when
例2：
-Did Jack come back early last night？
-Yes.It was not yet eight o'
clock________he arrived home.A.before B.when C.that D.until
总结二
这类考题出现频率较高，考生又极易混淆，在复习中做出归类非常必要：
1.It is/has been + 时间段 + since + 一般过去时
例1：
It is/has been 10 years since he came here.这类句型可转化为：
=Ten years has passed since he came here.这一句型可扩展为：
It was+时间段+since（从句用过去完成时）
例2：
It was years since he had arrived in China.（过去是+since+过去完成时）需要注意的是since从句的谓语动词一般是非延续性动词，但有时也可用延续性动词或表示状态的词，此时需要注意句子的翻译：
例3：
It is three years since she came to our class.
It is three years since she was in our class.
2.It + was + 时间点 + when clause（从句谓语用一般过去时）will be+时间点+when clause（从句谓语用一般现在时表将来）
It was already evening when he came back.
It will be midday when they get home.
3.It + will（not） be + 时间段 + before + 现在时was（not）+时间段+before+过去时
It will be another year before he comes here.
It was some time______we realized the truth.（2005山东24）A.when B.until C.since D.before
该句型中before前常用时间段，表示"
...之后才..."
"
在...之前就..."
;
有时before前也可以用时间点，此时突出表示动作的变化。
试比较：
It was evening before we reached the little town of Tailstocks.当我们到达Tailstocks时已经黑了。
（到达前天还没有黑）
4.It/This is + the + 序数词 + 时间 + 定语从句（从句用完成时）
It is the first time （that） I have been here.（定语从句）该句型可扩展为：
It was+序数词+时间+定语从句（从句用过去完成时）
It was the second time he had been out with her alone.
It'
s the second time you________late this week.
A.arrive B.arrived C.havearrived D.hadarrived
5.It is + （high）time + that + did（虚拟语气）
It is （high） time （that） we stopped pollution.其中that引导得从句中也可用should+V（原型）
It is （high） time （that） you came/should come here.写作中表示建议时也常可用这类句型。
s high time we took measures to solve this problem.注意应将以上5种句型与强调时间的强调句型的区别。
6.It be + 时间（被强调部分） + that
It was at 6 o'
clock that we heard the noise.
It was 3 years ago that he joined the army.最简单的判断方法是：
当表示时间的词前有介词或者后有副词时，一定是强调结构，必用that。
试比较下面句式与强调句的不同之处：
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.以上几句中时间前无介词后没副词故不是强调句型。
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.thatB.untilC.since D.before
5.Scientists say it may be five or six years_it is possible to test this medicine on human patients.
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 sinceC.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
9.I'
msorryyou'
vebeenwaitingsolong,butit'
llstillbesometime____Briangetback.
A.beforeB.sinceC.tillD.After
10.-Did Jack come back early last night？
clock________he arrived home.
A.before B.when C.that D.until
总结三
1.It is/has been + 时间段 + since + 一般过去时
It is/has been 5 years since he came toourschool.这一句型可引申为：
It was+时间段+since（从句用过去完成时）如：
It was 10years since he had arrived in China.需要注意的是since从句的谓语动词一般是非延续性动词，但有时也可用延续性动词或表示状态的词，此时需要注意句子的翻译：
总之，在翻译此类句子的时候我们要记住一点，那就是"
自从这一动作结束以来"
，只要记住这一点我们就比较好理解句子了。
2.It + was + 时间点 + when clause（从句谓语用一般过去时）
Itwill be+时间点+when clause（从句谓语用一般现在时表将来）
It was already eighto'
clock when he came back.
It will be midday when they get home.
3.It + will（not） be + 时间段 + before + 现在时
Itwas（not）+时间段+before+过去时
It will be another year before he comes here.It was some time______we realized the truth.（05山东24）
A.when B.until C.since D.before
4.It/This is + the + 序数词 + 时间 + that从句（从句用完成时）例如：
It is the first time that I have been here.该句型可引申为：
It was+序数词+时间+that从句（从句用过去完成时）
It was the second time thathe had been out with her alone.
5.It is + （high）time + that + did（虚拟语气）
It is （high） time （that） we stopped pollution.其中that引导得从句中也可用should+V（原型）如：
如：
s high time we brokeawayfromthebadhabitsandformedgoodones.注意应将以上5种句型与强调时间的强调句型的区别：
6.It be + 时间（被强调部分） + that如：
clock that we heard the noise.（强调句）It was 3 years ago that he joined the army.（非强调句）最简单的判断方法是：
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.以上几句中时间前无介词后没副词故不是强调句型。
总结四
探究语法填空中"
Itbe+时间+conj"
句型在各类考试和历届高考试题中"
it+be+time+conj"
句型以不同的形式出现,往往使同学们顾此失彼,一头雾水,原因在于没有搞清楚各个句型的特点及实质,现结合历届高考题分别予以探究。
（一）Itis+时间段+since+从句
Ithasbeen+时间段+since+从句此句型的要点：
（1）注意since前后句子时态.since前的时态为is或hasbeen,后的时态为一般过去时
Eg:
Itis（hasbeen）tenyearssinceIjoinedthearmy译为:
（2）since后的动词若为延续性或状态性动词,应译为否定或相反,若为短暂性动词按字面意思翻译.
Itis（hasbeen）tenyearssinceIwasateacher=Itis（hasbeen）tenyearssinceIleftthearmy译为:
.
ItistenyearssinceIsmoked=ItistenyearssinceIstoppedsmoking译为:
【链接训练】:
1、－Whatwasthepartylike？
－Wonderful.It'
syears____Ienjoyedmyselfsomuch
A.afterB.beforeC:
whenD:
since
2、IliveinBeijingnow,that'
stosay,it'
stenyearssinceI____Beijing.
A:
livedinB:
leftforC:
leftD:
wasin
3、I'
mateachernow,that'
stosay,itistenyearssinceI___ateacher.
havebeenB:
wasC:
becameD:
turned
（二）Itwillbe+时间段+before+一般现在时的从句"
要过多久/不久...才..."
Itwas+时间段+before+一般过去时的从句"
过了多久才..."
"
before"
句型和"
since"
句型的共性都加时间段,差异在于前后的时态和翻译。
①ItwillbetenyearsbeforeIreturnhome.译为:
②Itwastenyearsbeforehefoundhislostboy.译为:
1、Itisreportedthatitmaybetwoorthreemonths_____itispossibletotestthismedicineonanimals.
A:
si
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