Itsinceitbefore句型和练习

2. It will be two years the economic situation improves.

It+be+ 时间 +before/since/when/that 句型辨析

I. since

1.It is/has bee n+ 时间段+si nee sb did sth 某个动作发生持续多久

eg:It is/has been three years since he finished the work.

自从他完成这项工作已经三年了 .

2. 该句型中若 since 后跟延续性动词，要翻译成否定含义 , 即“没做某事已经多 久了”.

eg:It has been three years since he worked here. 他不在这工作已经三年 了.

It has been three years since he smoked. 他已经戒烟三年了 .

但是：It has been three years since he began to smoke.

他吸烟有三年了。

II .before.

1.It was/will be+ 时间段+before... 过多长时间将发生某动作或事情；或过 了多久发生了某事或动作。

eg:It was three years before he finished the work. 项工作.

It will be three years before he finishes the work. 这项工

作 .

2.It won't be/take long before... 不久就会… eg:It won't be long before he finishes the work. 作.

III when.

when 没有固定与It is …连用的句型.when 可表示时间点或时间段，因此从句 中短暂性动词或延续性动词均可用 .when 还可作并列连词，表示突然发生一个 动作, 等于 and at that time. 常用句型 :

1 主语 +was/were doing whe n...

2 主语 +was/were about to do whe n...

It+be+ 时间 +before/si nce/whe n/that 重要考点练习

It +be+时间+before/s in ce/whe n/that 是高考中每年必考的重要考点，而学生却对这个句型

中几个关联词的选择把握不准，造成失分。我在试题讲解的过程中设计了以下几个小题，

让学生去分析，整理，归纳，效果很好。

1. It was two years _______ h e realized the truth.

3. It was two years later _______ he realized the truth.

他花了三年才完成这 他得花三年才能完成

他不久就会完成这项工

4. It is /has been two years ______ he lived here.

5. It was midnight ______ he arrived home.

6. It was at midnight ______ he arrived home.

7. It was not until midnight _____ he arrived home.

A. before

B. when

C. since

D. that

「答案与解析」

1、2 两个小题都选A. 第一题意为：两年后他才得知真相。第二题意为：经济形式要等两年后才会有所好转。

「归纳」It was/ will be + 一段时间+before+ 句子是高考一个重要考点。意为：多久之后

才……

要注意：It will be + 一段时间+before+ 句子，before 引导的是一个时间状语从句，所以后面的从句要用一般现在时态表将来。

3. D此题为强调句型。把It was…tha去掉后，句子仍然成立：He realized the truth two years later.

4. C 本句意为：他不住在这儿已经两年了。

「归纳」为since 意为自从某时或某事发生以来，故since 后从句时，从句的时态应用一般过去时态，而主句应用现在完成时态。如表示某某事发生多久了，则用：It is/ has been+一段时间+si nce+从句。

「注意」It is/ has bee n+—段时间+since+从句。在本结构中，从句的谓语动词如为延续性

动词时，翻译时要从动作结束时算起。

5. B 本句为定语从句，先行词为midnight ，在从句中作状语。要注意与第 6 小题的区

别，第6 题为强调句型，故答案应为that.

6. D 再看下面两题：

(1) It was the park __________ he first met his wife.

(2) It was in this park ________ he first met his wife.第一题答案应为where，为定语从

句；第二题答案为that，为强调句型。

7. D本题亦为强调句型结构：It was notun til …意为：•直到才................