结构It时间从句的区别完整解释Word格式文档下载.docx

1、结构从句中谓语动词的形式含义例句It is +时间段+since从句一般过去时（到现在为止）做某事已有多长时间了It is three years since the war broke out.It was+时间段+since从句过去完成时（到过去某时为止）做某事已有多长时间了It was two years since he had left here.It was +时间段+before从句过了多长时间才It was a long time before I got to sleep again.It was not +时间段+before从句没过多长时间就It wasnt long b

2、efore he told me about this affairIt will be +时间段+before从句一般现在时要过了多长时间才It will be five years before we meet again.It will be not +时间段+before从句It wont three hours before he arrives at the bus stop.It is/was +时间点+when引导的定语从句做某事的时间是什么时间It was eight oclock in the morning when he went shopping.It is/was+

3、时间状语+that引导的强调句正是在某个时间，某事发生了It was at eight oclock in the morning that he went shopping.Its time that+从句一般过去时（或should+动词原形）是该做某事的时候了It is time that I went （should go） to pick up his daughter.It is the first/second/third time +that从句现在完成时某人第一/二/三次做It is my first time （that） I have visited the Great W

4、all.It/This/That was the first/second/third time +that从句It was the second time that the film had been shown in this cinema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，意为过量长时间才.；主句是否定式时，意为没过

5、量久就.。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. 二、 It +will be （ was ） + 时间段 +until 从句 若主句中用一般将来时，则从句中用一般

6、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. It will be ten days until my birthday comes. 2. It was only five minutes until her husband came back from work.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

7、用 before 引导从句。三、 It +is / has been （ 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. It is two years since Jim came to China. 2. It has been three years since they got married.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. It is /

8、has been a year since he smoked.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. It was October 1st, 1949 when the Peoples Republic of China was founded.2. What time was it when you got to school?五 . It is /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

9、，某事发生了例如1. It was ten years ago that he joined the army. 2. It was yesterday afternoon that I met him in the street.六、 It is / was +first time / second time + （ 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. This is the first time in my life that I have come to Beiji

10、ng.2. It was the third time that he had asked the same question. 七、 It is （ 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. It is high time that we began our work. 2. It is time that he left the place.【链接训练】例1：Itisalmostfiveyears_wesaweachotherlasttime.（05北京） A

11、.before B.since C.after D.when例2：-DidJackcomebackearlylastnight？ -Yes.Itwasnotyeteightoclock_hearrivedhome. A.beforeB.whenC.thatD.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.Itis/hasbeen+时间段+since+一般过去时 例1：Itis/hasbeen10yearssincehecamehere.这类句型可转化为： =Tenyearshaspassedsincehecamehere. 这一句型可扩展为：Itwas+时

12、间段+since（从句用过去完成时） 例2：ItwasyearssincehehadarrivedinChina.（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：Itisthreeyearssinceshecametoourclass. Itisthreeyearssinceshewasinourclass.2.It+was+时间点+whenclause（从句谓语用一般过去时） willbe+时间点+whenclause（从句谓语用一般现在时表将来）Itwasalreadyeveni

13、ngwhenhecameback.Itwillbemiddaywhentheygethome.3.It+will（not）be+时间段+before+现在时 was（not）+时间段+before+过去时Itwillbeanotheryearbeforehecomeshere.Itwassometime_werealizedthetruth.（2005山东24） A.whenB.untilC.sinceD.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：ItwaseveningbeforewereachedthelittletownofTailstocks. 当我们到达Tailstocks时已经黑了。（到达前天还没有黑）4.It/Thisis+the+序数词+时间+定语从句（从句用完成时）Itisthefirsttime（that）Ihavebeenhere.（定语从句） 该句型可扩展为：Itwas+序数词+时间+定语从句（从句用过去完成时） Itwasthesecondtimeheh