(完整版)条件状语从句讲解

条件状语从句讲解

在复合句中，由从句表示的状语叫做状语从句。它可以用来修饰主语中的动词.形容词.副词等。根据它表达的意思，状语从句可以分为时间状语从句，地点状语从句，条件状语从句，比较状语从句，目的状语从句，结果状语从句和让步状语从句等。由连接词if或unless引导的状语从句叫做条件状语从句。

条件状语从句的有关知识

语法引导条件状语从句最常用的连词是if,由if引导的条件状语从句表示在某种条件下某事很可能发生。如:

1 If you ask him, he will help you.如果你请他帮忙,他会帮你的。

2 If you fail in the exam, you will let him down.如果你考试不及格,你会让他失望的。

另外,if从句还表示不可实现的条件或根本不可能存在的条件,也就是一种虚拟的条件或假设,从句多用一般过去时或过去完成时。

如: If I were you, I would invite him to the party.

如果我是你,我会邀请他参加聚会。

I would have arrived much earlier if I had not been caught in the traffic.

如果没有堵车,我会到的早一点儿。

那么,除了if之外,是否还有其他连词也可以引导条件状语从句呢?回答是肯定的,不仅有,还有很多。这些词由于出现的频率较小,且用法较复杂一些,所以不如if为大家所熟知罢了。

下面就这些词的用法以例句的形式进行一下简单总结。

1、unless conj.除非,若不,除非在……的时候

You will fail to arrive there in time unless you start earlier.

如果你不早点动身,你就不能及时赶到那儿。

Unless it rains, the game will be played.

除非下雨,比赛将照常进行。

2、on condition(that)...在……条件下,如果 on condition (that)...

引导的条件从句是主句事件发生的前提条件或唯一条件。

3、I can tell you the truth on condition that you promise to keep a secret.

我可以告诉你真相,条件是你答应保守秘密。

You can go swimming on condition (that) you don't go too far from the river bank.你只有在不远离河岸的条件下才可以下水游泳。

4、supposing conj.如果,假如 supposing引导的条件从句表示一种假设条件。 Supposing it rains, shall we continue the sports meeting?倘若下雨,我们的运动会还要继续举行吗?

Supposing something should go wrong, what would you do then?假如出了什么问题,你准备怎么对付?

5、provided conj.假如,除非,以……为条件 provided (that) +从句表示一种假设条件。

He will sign the contract provided we offer more favorable terms.如果我们提出更优惠的条件,他就会在合同上签字。

He won't be against us in the meeting provided that we ask for his advice in advance.如果我们提前征求一下他的意见,他就不会在会上反对我们。

从上述例句可以看出if, unless, on condition (that), supposing, provided等词引导的条件状语从句,主从句条件关系分明,结构清晰。

但有些句子,虽没有含条件关系的连词,却也隐含着条件关系,这些句子常用一些词,如but for, without等引出一个介词结构来表示条件,条件常常是虚拟的,或与事实相反的假设。

如: but for若非,要不是

But for the rain, we should have a pleasant journey.要不是下雨,我们的旅行肯定会很愉快。 But for your help,we should not have finished in time.要不是你帮忙,我们肯定不能及时完成任务

经典语句：If it doesn't rain tomorrow,we will go to the zoo. If you open the door，i will come in.

条件状语从句就是用以表示“在某种条件下,会……”常用if ,in case , on

condition等词来引导连接词主要有if, unless, as/so long as, on condition that,provided,suppose,supposing 等。主句用一般将来时，if或unless引导的条件状语从句用一般现在时。

unless = if...not.

e.g. Let's go out for a walk unless you are too tired. If you are not too tired, let's go out for a walk.

if 引导的条件句有真实条件句和非真实条件句两种:

真实条件句，如：If it rains tomorrow, we won’t go on a picnic. 非真实条件句是虚拟语气的一种，表示与事实相反，

如： If I were you, I would go with him. so/as long as只要由as (so) long as, in case引导。 So long as you’re happy, it doesn’t matter what you do. 只要你高兴，你做什么都没有关系。 You may borrow my book as long as you keep it clean. 只要你保持书的清洁，你就可以把我的书借去。 Take your umbrella in case it rains. 带着你的伞吧，以防下雨。

引导条件状语从句的连词有：if（如果），unless（除非；如果不），as long as（除非；只要），supposing（假设），on condition that（条件是），in case （如果）。

1学习条件状语从句应注意以下几点：（1）条件状语从句中一般不使用将来时态，尽管主句使用将来时态，而从句用一般现在时或现在完成时。

（2）注意条件状语：从句在虚拟语气中的使用。

高中英语状语从句讲解汇总

高中英语状语从句讲解汇总 原因从句 除了下面A2，A3中所示各种类型外，这两种从句均可由as或because来引导。但是用as引导原因从句较为稳妥（参见A）；用because引导结果／原因从句较为稳妥（参见B）。 A 原因从句 1 由as／because／since 引导的原因从句： We camped there as／because／since it was too dark to go on． 我们在那里露宿是因为天太黑，不能再继续往前走了。 As／Because／Since it was too dark to go on，we camped there． [ 因为天太黑不能再继续往前走，我们就在那儿露宿了。 2 in view of the fact that可用as／since／seeing that来表示，但不能用because： As／Since／Seeing that you are here，you may as well give me a hand． 既然你在这儿，你就帮我个忙吧。 As／Since／Seeing that Tom knows French，he’d better do the talking． 既然汤姆懂法语，最好让他来谈。 3 在as／since／seeing that意指以前共知的或共知的陈述时，可用if来代替： ~ As／Since／Seeing that／If you don’t like Bill，why did you invite him 既然／如果你不喜欢比尔，你为什么邀请了他 注意：if so的用法： —I hope Bill won’t come． —If so（＝If you hope he won’t come），why did you invite him —我希望比尔别来。 —如果这样（=如果你希望他不来），你为什么邀请了他 关于if＋so／not，参见第347节。 ~ B 结果从句由because或as引导： The fuse blew because we had overloaded the circuit． 保险丝烧断了，因为我们使线路超载了。 He was angry because we were late． 他生气是因为我们来晚了。 As it froze hard that night there was ice everywhere next day． 因为那天晚上冷得厉害，所以第二天到处都是冰。 ~ As the soup was very salty we were thirsty afterwards． 因为这汤很咸，后来我们渴得厉害。

2019英语四级语法精讲：原因状语从句

2019英语四级语法精讲：原因状语从句 原因状语从句 连接词：because，since，as，for，now that，in that，owing to，due to，thanks to，because of，as a result of; 比较：because，since，as和for 1)because语势，用来说明人所不知的原因，回答why提出的问题。当原因是显而易见的或已为人们所知，就用as或 since。 I didn't go, because I was afraid. Since /As the weather is so bad, we have to delay our journey. 2)由because引导的从句如果放在句末，且前面有逗号，则能够用for 来代替。但如果不是说明直接原因，而是多种情况加以推断，就只能 用for。 He is absent today, because / for he is ill. He must be ill, for he is absent today. now that ：既然; in that ：因为，通常只能放在句中，强调重要的，的的原因; eg：Now that this semester is finished, I am going to rest a few days and take a trip. Human beings are different from animals in that human can speak and think. owing to, due to, thanks to, because of , as a result of等短 语后面只能接词或短语，不能接从句。

(专题精选)初中英语语法知识—状语从句的分类汇编含答案

一、选择题 1．You will never gain success ______ you fully put your effort into your work. A．although B．unless C．if D．because 2．— Can you tell me when you are going to arrive there? —I’m not sure. But I’ll ring you up as soon as I _____there tomorrow. A．arrive B．arrived C．will arrive D．am going to arrive 3．Jenny often eats a lot of fruit and vegetables_______she knows they are good for health. A．because B．but C．or 4．Li Lei didn’t go to bed his mother came back last night. A．after B．until C．because 5．I still have difficulty ________the article________ there are few new words in it. A．to understand; because B．understand ; though C．understanding ; if D．understanding ; though 6．I don’t like nuts ________ they are too hard. A．if B．after C．when D．because 7．The little girl is crying，she can’t find her parents. A．and B．but C．so D．because 8．—I’m afraid I can’t finish the job in such a short time. —Don’t worry. Can you do it if you_______ two more hours.? A．give B．are given C．will give D．will be given 9．______ we have different opinions from time to time, we are still good friends. A．Until B．After C．Because D．Though 10．—Mum, will our trip be cancelled? —No, we won’t put it off________there is a natural disaster. A．if B．whether C．unless D．when 11．—Do you think if I am suitable for this IT job? —You can’t get the job________ you have experience in the computer industry. A．if B．unless C．because D．since 12．You will never get anywhere you set a goal. So whatever we do, we should first have a goal. A．unless B．because C．though 13．________ they are sisters, they don’t look the same. A．Though B．Because C．But 14．Joan was walking in the street________ she saw the accident. A．when B．while C．after D．before 15．Now most families have only o ne child _____ our country’s one-child policy. A．so B．because C．because for D．because of

(完整版)地点状语从句用法及例题解析

地点状语从句 地点状语从句表示地点、方位，这类从句通常由where引导。 用法 例如： Where there is a will, there is a way. 有志者，事竟成。 They will go where they are happy. 他们想到他们觉得快乐的地方去。 连词含义说明 where在……地方通常表示一个确定的wherever无论什么地方表示“任何地方”anywhere无论何处 everywhere到处 (1)地点状语从句由where，wherever，引导， 如： We must camp where we can get water. 我们必须在能找到水的地方露营。 (2)地点状语从句与定语从句的区别: 在于分句在句中作什么成分。作状语，则是状语从句；作定语修饰名词，则是定语从句where引导定语从句时，从句前应有一个表示地点的名词作先行词；而状语从句前则无需先行词。 如： Go back where you came from.(where引导地点状语从句） 你从何处来到何处去。 Go back to the village where you came from.(where引导定语从句，修饰village) 回到你来的那个村子里去。 (1)We went home, where we had dinner.此句是where引导的"非限制性"定语从句,这里"where"= at home(先行词是home)从句还原" we had dinner at home"全句译：我们回到家，在家里吃了顿饭. (2)I walk into the canteen where students are eating此句也是where 引导的定语从句，与上句不同之处在于此句是一个"限制性"定语从句.全句译：我走进了这个同学们都在吃饭的食堂。（限定说明了是一个什么样的食堂) (3)地点状语从句与定语从句其本身属性就不同：地点状语从句相当于大的副词;定语从句相当于大的形容词,副词是用来修饰动词的,

原因状语从句

在复合句中，由从句表示的状语叫做状语从句。它可以用来修饰主语中的动词.形容词.副词等。根据它表达的意思，状语从句可以分为时间状语从句，地点状语从句，条件状语从句，比较状语从句，目的状语从句，结果状语从句和让步状语从句等。由连接词if或unless引导的状语从句叫做条件状语从句。在英文中，条件是指某一件事情实现之后（状语从句中的动作），其它事情（主句中的动作）才能发生，通常译作“假如”。（注意：在含有条件状语从句的复合句中，表示将来时态，主句是一般将来时态，从句要用一般现在时[主将从现原则]) [编辑本段] 条件状语从句的有关知识 语法引导条件状语从句最常用的连词是if,由if引导的条件状语从句表示在某种条件下某事很可能发生。如: If you ask him, he will help you.如果你请他帮忙,他会帮你的。 If you fail in the exam, you will let him down.如果你考试不及格,你会让他失望的。 另外,if从句还表示不可实现的条件或根本不可能存在的条件,也就是一种虚拟的条件或假设,从句多用一般过去时或过去完成时。如: If I were you, I would invite him to the party.如果我是你,我会邀请他参加聚会。 I would have arrived much earlier if I had not been caught in the traffic.如果没有堵车,我会到的早一点儿。 那么,除了if之外,是否还有其他连词也可以引导条件状语从句呢?回答是肯定的,不仅有,还有很多。这些词由于出现的频率较小,且用法较复杂一些,所以不如if为大家所熟知罢了。下面就这些词的用法以例句的形式进行一下简单总结。 1、unless conj.除非,若不,除非在……的时候 You will fail to arrive there in time unless you start earlier.如果你不早点动身,你就不能及时赶到那儿。 Unless it rains, the game will be played.除非下雨,比赛将照常进行。 2、on condition(that)...在……条件下,如果on condition (that)...引导的条件从句是主句事件发生的前提条件或唯一条件。 I can tell you the truth on condition that you promise to keep a secret.我可以告诉你真相,条件是你答应保守秘密。 You can go swimming on condition (that) you don't go too far from the river bank.你只有在不远离河岸的条件下才可以下水游泳。 3、supposing conj.如果,假如supposing引导的条件从句表示一种假设条件。 Supposing it rains, shall we continue the sports meeting?倘若下雨,我们的运动会还要继续举行吗?

语法讲解 时间状语从句的用法解析及练习

语法讲解时间状语从句的用法解析及练习 状语从句在复合句中作状语，其位置较灵活，可以在主句之前、之后或中间(放在句首时状语从句后面常用逗号，放在句末时状语从句前面往往不用逗号)。根据状语从句的含义，状语从句主要分为时间状语从句、地点状语从句、原因状语从句、目的状语从句、方式状语从句、结果状语从句、条件状语从句、让步状语从句等八种。掌握以上各种状语从句的关键在于把握其相应的引导词。以下是对时间状语从句的基本用法进行小结，希望可以帮助到同学们有一更深的理解。 时间状语从句的引导词 when, before, after, as, while, till/until, since，whenever 时间状语从句的用法 时间状语从句的引导词所表示的意思不尽相同，要注意把握不同的时间状语从句的引导词所表示的不同时间关系，以及它在具体句子中对应的对应时态、语态等问题。 1. when、as、while引导的时间状语从句分析： (1) when引导时间状语从句时表示“当……的时候”，when既可以指时间段也可指时间点，从句中既可用延续性动词又可用非延续性动词，且动作既可和主句的动作同时发生又可在主句的动作之前或之后发生。 注意体会如下例句：I’ll call you when I get there. 我一到那里就给你打电话。// When the wind blows, all the doors rattle. 只要风一吹，这门就吱嘎作响。// He stopped trying, when he might have succeeded next time. 他不再试了，其实他可能下一次就成功。// When I came home my wife was cooking dinner. 我回家时，妻子在做晚饭。 如果when引导的时间状语从句的主语与主句主语相同，而从句的谓语又是be动词时，那么从句中的主语和be可以省略;当when引导的时间状语从句的主语与主句主语相同时，往往还可以用“when+分词”的形式替代该状语从句。例如：When (you are) in trouble, ask her for help. 当你遭遇麻烦的时候去向她求助。// When I came into the room (=When coming into the room), I found him lying there asleep. 当我进入房间的时候，我发现他躺在那儿睡着了。 (2) while引导时间状语从句时表示“当……的时候”，它强调主句的动作与从句的动作同时持续地进行，用于这一用法时while引导的时间状语从句和主句中的谓语动词必须是延续性动词，或者主句的动作发生在从句动作的进行过程中，主句中的谓语动词通常是非延续性动词，例如：Study while you study; play while you play. 该学习的时候就学习，该玩的时候就玩。// I met her while I was at school. 当我在学校的时候我遇见了她。 (3) as引导时间状语从句时表示“当……时，一边……一边……”，侧重表示两个动作同时发生(包括一个主语同时进行两个动作)，或者一种动作随着另一种动作的变化而变化。例如：He jumps as he goes along. 他边走边跳。// I slipped on the ice as I ran home. 我跑回家时在冰上滑了一跤。// I saw him as he was getting off the bus. 正当他下公共汽车时, 我看见了他。// As the wind rose the noise increased. 刮风的时候噪声增大。

中考语法专题之状语从句(有答案)

教学内容状语从句 教学目标常考状语从句的用法 状语从句 定义：在复合句中修饰主句中的动词、形容词或副词等的从句叫做状语从句。状语从句根据它表示的意思的不同可分为时原因、结果、让步、比较（或方式）和条件等类。 一. 掌握原因状语从句： 常用引导词：because（因为）; since（既然）; as（由于） 1. 既然大家都在了，我们开始上课吧 ____________ everybody is here, let’s ___________ our class. t be able to understand what you say, ___________ you speak too quickly. 2. I won’ A. because of B. though C. because D. so 二. 掌握结果状语从句： 常用引导词：so……／so…that…/such…that… 常用句式：(1) …so adj./adv. + that从句 (2) … such + a/an + adj. +可数名词单数+that从句 (3) …such + adj. + 可数名词复数+that从句 (4) …so + adj. + a/an + 可数名词单数+that从句 1. Durian 是如此的美味，很多人都很想吃。 Durian is __________ __________ __________ many people would like to eat. 2. Kelly 是如此细心的一个女孩，她在作业上几乎不会犯错。 Kelly is __________ __________ _________ girl __________ she hardly makes mistakes in her homework. 注意：※so many/much/few/little 已成固定搭配，不能换成such。 三. 掌握时间状语从句： 常用引导词: before, after, when, while, as, as soon as, since, not…until... 1. Jason __________ you as soon as he __________ home. A. will call; will arrive B. will call; arrived C. will call; arrives D. call; arrives 2. I have been a member of the club __________ I was a high school student. A. before B. after C. until D. since 3. 昨晚，他直到他妈妈回到家才去睡觉。 Last night, he __________ __________ to sleep __________ his mother __________ home. 4. 昨晚，当我妈妈进入我的房间时，我在玩LOL。

时间状语从句讲解和练习

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状语从句讲解及习题附答案

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的，发生时间较长，并强调主句和从句的动作同时发生（或者相对应）。While 有时还可以表示对比。While John was watching TV, his wife was cooking. as 意为“一边…一边…”。As 引导的动作是延续性的， 发生时间较短，一般用于 主句和从句动作同时发 生；as也可以强调一前一 后。The writer was angry as he was travelling on a train to London because someone had invaded his “space”. He smiled as he stood up. after 意为“在…之后”。表示主句 动作发生在从句动作之 后。主句与从句的动作时 间关系与before引导的从 句相反。With many hungry visitors waiting, don’t stay too long at your table after you have finished. If an early exit is necessary, you can leave after a scene is over. before 意为“在…之前”。引导的从 句不用否定形式的谓语， 并且当before引导的从句 位于主句之后，有时译成 “就，才”。当主句用将来时，You can’t watch TV before you finish your homework. Before it ended, the theatre was almost empty. My father had left for Canada

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Finish this so that you can start another.把这个做完，你可以开始另一个。 结果状语从句： He was so angry that he couldn't say a word. 他气得说不出话了。 让步状语从句： Though he is in poor health, he works hard.虽然他身体不好，但是他工作很努力。 方式状语从句： Students do as the teachers say.学生们按照老师说的去做。 比较状语从句： The work isn't as easy as I thought.这项工作比我想象得难。 例题解析：举一反三，学的更轻松！ 1. 易混引导词while, when, as的区别： when既可以指"时间点",与瞬间动词连用，也可以指"时间段"，与延续性动词连用 （=while）。如： When he came in, his mother was cooking. When (While) we were at school, we went to the library every day. While表示时间段,因此，while 从句的谓语动词要用延续性动词。如： Please don't talk so loud while others are working. As与when用法相似，但着重强调主句动作与从句动作同时发生，有"随着……"或"一边……一边……"之意。如： As you get older, you get more knowledge.随着年龄的增长，你获得的知识就越多。 2．Because,as,since 的区别： Because用于表示直接原因,回答why提出的问题，语气最强；As用于说明原因, 着重点在主句，常译成"由于"；since表示显然的或已知的理由或事实，常译成"既然"。如： Water is very important because we can't live without it. He didn't come yesterday as his mother was ill. I'll do it for you since you are busy.

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咼中英语状语从句 定义: 在句中作状语的从句是状语从句，修饰主句中的动词、形容词或副词等.状语从句由从属连词引导，从属连词在句中不充当句子成分，只起连接作用，状语从句放在句首时，要用逗号，放在句 尾时不用. 分类 根据意义上的不同，状语从句可分为：①时间状语从句②地点状语从句③原因状语从句④ 目的状语从句⑤条件状语从句⑥结果状语从句⑦让步状语从句⑧方式状语从句⑨比较 状语从句三、时间状语从句主句是一般将来时，时间状语从句用一般现在时表将来；主句是—过去将来时，从句用一般过去时表示过去将来时；主句是一般过去时忆：“主将 ，从句用一般过去时.记从现” (一)引导时间状语从句的连词有：As，whe n (whe never)，before，after，as soo n as，un til (till)，since，every time，once. | （二）、具体应用1）“while ”主、从句动作或状态同时发生.用while引导的从句用延续性 动词，常表示较长的时间或一个过程.记忆：While 后用进行时.While we were having supper， all the lights went out. Please kee p quiet while others are study in g」 While I was writing letters last night，he was watching TV. 2 ）When 表示“就在”的时候"， while 意为反而，可是，表示转折.One evening Beethoven was walking in a street，when he sudde niy stopped outside a little house. 3）When ever无论什么时候，随时 1.When ever some one throws in some rubbish，the truck p roduees a pi eee of music. 每当有人扔进一些垃圾时，它（汽车）就放一段音乐 2.When ever we' re in trouble，they will help us. 3.I go to the theatre, whe never I am free. https://www.wendangku.net/doc/d1647543.html,e and see me whe never you want to.你随时来看我 4) till和until(表示"直到” ”)句首多用until | 1在肯定句中表示“直到”为止”，主句谓语动词要用延续性动词 I was wait ing un til/till he arrived. 2、在否定句中表示“直到，，才”主句谓语动词常用终止性动词，这时until和till常被before 替换. I did n' t leave till/un til she came back. 5) si nee:主句用完成时，从句用一般过去时，si nee引导的从句间或可用现在完成时 It is two years since I have studied En glish. 1.We have known each other si nee we were childre n. 2.We have bee n friends （ever sin ce） since we met at school. 3.It is ”（一段时间）+since+—般过去时态句子 It is two years since my sister married. I

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1．when , while, as都可解释为“当```的时候”但侧重点有所不同。 1) When后既可以接短暂性动词，也可以接延续性动词，表示从句动作与主句动作同时发生。 When I arrived home , I had a little rest. 2）As 除了表示“当```的时候”，还可表示为“一面```一面”，“随着” He sang as he danced.(一面```一面) You will grow wiser as you grow older.(随着) 3)While表示“当```的时候”强调主句的动作和从句的动作同时发生，从句一般用进行时，从句动词必须是延续性动词。 While we were working, they were having a rest. While (they were) having a discussion, they got very confused. 注意：while 有对比的含义，解释为“然而”。eg: I prefer black tee, while he likes coffee. 2．until, not…until表示“直到`才”,在肯定句中主句常用延续性动词；在否定句中常用短暂性动词。 肯定句：I waited until midnight. 否定句：I did not leave until midnight. 注意点：1）not until…在句首，主句用倒装 Not until you had explained how did I manage to do it. 2) It is not until…that…引导的强调句It was not until it was dark that he came back. 3．Hardly/scarcely…when, no sooner…than, as soon as表示为“一```就```” I had hardly/scarcely got home when it began to rain.

第 二十五讲 状语从句的翻译

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