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It is +时间+since when before

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It+be+时间+before/since/when/that句型辨析
I since
1. 翻译
“It is/ has been + 时间段 + since从句”
(1) 当从句谓语动词为非延续性动词时，表示这段时间从该动作开始时算起，即“自从做……以来已经多久了”。

(2) 当从句谓语动词为延续性动词时，表示这段时间从动作结束时算起，即“自从不做……以来已经多久了”。

It is two years since he joined the army.
他参军两年了。

(从参军那一刻算起)
It is two years since he was a soldier.
他退役两年了。

(从他不再是士兵算起)
2. 时态
主句为现在时（一般或完成），从句都是一般过去时。

主句为过去式（一般性都用was就够了），从句都是过去完成时
II before
1. 翻译
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。

It was three years before he finished the work.他花了三年才完成这项工作.
It will be three years before he finishes the work.他得花三年才能完成这项工作.
2.It won't be/take long before...不久就会…
It won't be long before he finishes the work.他不久就会完成这项工作.
2. 时态
主句为过去式（一般性都用was就够了），从句用过去时
主句为将来时，从句用现在时（用一般现在时表示将来）
III when
1. 翻译
It is + 时间点+ when…
当发生什么的时候是什么时候…
It was one o’clock when he came in .
2. 时态
主句是什么时态，从句就是什么时态
3.常考
与强调句的区别
It was five o'clock when we arrived at the small mountain village.
It was at five o'clock that we arrived at the small mountain village.
强调句去掉it、be和that，余下的部分仍是一个完整的句子。

It+be+时间+before/since/when/that重要考点练习
1. It was two years ________he realized the truth.
2. It will be two years ________ the economic situation improves.
3. It was two years later ________ he realized the truth.
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…that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+since+从句。

「注意」It is/ has been+一段时间+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 not until…that…意为：直到……才……。

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It is +时间+since when before

It is +时间+since when before

It+be+时间+before/since/when/that句型辨析I since1. 翻译“It is/has been+时间段+since从句”(1)当从句谓语动词为非延续性动词时，表示这段时间从该动作开始时算起，即“自从做……以来已经多久了”。

(2)当从句谓语动词为延续性动词时，表示这段时间从动作结束时算起，即“自从不做……以来已经多久了”。

It is two years since he joined the army.他参军两年了。

(从参军那一刻算起)It is two years since he was a soldier.他退役两年了。

(从他不再是士兵算起)2. 时态主句为现在时（一般或完成），从句都是一般过去时。

主句为过去式（一般性都用was就够了），从句都是过去完成时II before1. 翻译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。

It was three years before he finished the work.他花了三年才完成这项工作.It will be three years before he finishes the work.他得花三年才能完成这项工作. 2.It won't be/take long before...不久就会…It won't be long before he finishes the work.他不久就会完成这项工作.2. 时态主句为过去式（一般性都用was就够了），从句用过去时主句为将来时，从句用现在时（用一般现在时表示将来）III when1. 翻译It is + 时间点+ when…当发生什么的时候是什么时候…It was one o’clock when he came in .2. 时态主句是什么时态，从句就是什么时态3.常考与强调句的区别It was five o'clock when we arrived at the small mountain village.It was at five o'clock that we arrived at the small mountain village.强调句去掉it、be和that，余下的部分仍是一个完整的句子。

it+be+时间+before,since,when从句 课件

it+be+时间+before,since,when从句 课件

It +be +时间+ before/since/when 从句
1. It is / has been + 一段时间 + since从句
如：It is 17 years since Hongkong returned to China.
香港回归已经有17年了。
在“It’s +时间段+ since从句” 句型中，如果since从句的谓语动 词是瞬间性动词，表示肯定意义； 如果since从句的谓语动词是延续
了多长时间之后才……” 例： It was long before they found their son. 过了很久他们才找到他们的儿子。
② 若主句是否定形式，翻译成 “没过多久就……” 例：
It was not long before the couple met again. 没过多久这对夫妻就见面了。
分析：since从句中的系表结构表示 一种状态，这种状态是延续性的， 表示否定意义，译为“不是，不当”
注：时间的计算一律从since从句 的动作完成或状态结束时算起。
It is/has been two days since she fell ill. (她生病两天了） It is/has been two days since she was ill.
5. It was midnight _w__h_e_n___ he arrived home. 6. It was at midnight __t_h_a_t___ he
7a.rIrtivweadshnoomt eu.ntil midnight _t_h_a_t___ he arrived home.
强化习题：
ቤተ መጻሕፍቲ ባይዱ
时间状语从句讲解和练习(答案)

时间状语从句讲解和练习(答案)

时间状语从句用句子表达一件事情或一个行为发生的时间，这个句子就叫时间状语从句。

时间状语从句根据其所表示的时间不同，所使用的连词也不同。

下面我们一起来看一下几个常见的时间状语从句：1．when引导的从句：表示主句的动作和从句的动作同时发生，或从句的动作发生在主句动作之前。

例如：I was going out when a visitor came. (动词动作同时发生。

)我正要出门，有客人来访。

I shall tell her the good news when she comes.她来时，我将告诉她这个好消息。

小试牛刀：I found mother cooking for me. I got home.(when)_______________________________________ He was listening to the radio when I home. (get)2．while 引导的从句：表示“当……过程中”，强调某一段时间内主句和从句中谓语动词所表示的动作在同一时期发生。

由于while从句表示一个持续的行为，所以从句中要用持续性动词，并且持续性动词常用进行时态。

例如：Keep an eye on my little sister while I am away.我不在时，请照看一下我的小妹妹。

While we were watching TV, Jim came in. 我们看电视的时候，Jim进来了。

小试牛刀：It started to rain. We were playing football.(while)_______________________________________ Lucy was cleaning the room Lily was listening to music.3．as引导的时间状语从句：表示“当……的时候；一边……一边……；随着……”，其从句的主语与主句的主语往往是同一人或物。

It is + 时间段 + since句型复习

It is + 时间段 + since句型复习


• A. takes charge of B. took charge of • C. is in charge of D. was in charge of
•
• 2.They asked me to have a drink with them.I said it was nine years since I______a good drink.
• A. enjoyed
B. was enjoying
• C. had enjoyed D. had been enjoying
• 3. It was about midnight _________ we found the lost child, crying under a tree.
• A. that B. until C. when D. where
• 9. It ______ long before we _______ the result of the experiment. (上海春)
• A. will not be; will know • B. is; will know • C. will not be; know
D. is; know
• A. that B. until C. since D. before
• 8. ---Did Jack come back early last night? • ---Yes. It was not yet eight o’clock ________
he arrived home. (福建卷) • A. before B. when C. that D. until
2. It won’t be long before they understand each other.