高考英语语法考点状语从句

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高中英语语法总结之状语从句(共37张ppt)

• Difficulties are nothing if we are not afraid of them.如果我们不怕困难，困难就算不了什么了。
• We shall go there tomorrow unless it rains. = We shall go there tomorrow if it doesn’t rain. 除非下雨，我们明天就去那里。
• Every time I travelled by boat, I got seasick.我每次乘船都晕船。
• The moment I heard the song, I felt cheerful. 我一听到这首歌，就感到很愉快。
• Next time you come ,you’ll see him.下次你来的时候，就会见到他。
• We were not tired though (although) we had worked all day.虽然我们干了一天活，但并不累。
• （2）even if, even though（even if 和even though的意思为“即使”“纵使”有退一步设想的意味，多用于书面语中）。
• 5、结果状语从句：
• （1）so that，so…that（so that前有逗号为结果状语从句，so…that的so后面跟形容词或副词）。
• We turned up the radio, so that everyone heard the news.我们把收音机的音量放大，大家都听到了新闻。
• Seeing (that) he was badly ill, we sent for the doctor.鉴于他病情严重，我们派人去请医生去了。

高考英语重要语法知识：状语从句

高考英语重要语法知识：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比较状语从句一、时间状语从句引导时间状语从句的连词有：as, when(whenever),while, before, after, as soon as, until(till), since,every/each/next time, once.（ as, when, while都有“当……的时候”，可以互用）◆When、While、as的区别：①when是at or during the time ,既指时间点，也可指一段时间，因此when引导的时间状语从句中的动词可以是终止性动词，也可以是延续性动词；while是during the time,只指一段时间，所以while从句中的动词必须是延续性动词。

②when说明从句的动作和主句的动作可以是同时，也可以是先后发生；when从句多用一般过去时while主从句动作或状态同时发生。

while从句多用过去进行时eg. When the teacher came in,we_____________________(talk).When the clock struck twelve,all the lights went out.When we arrived at the station,the train had left.While we _____________(have)supper,all the lights went out.While I was writing letters last night,he was watching TV.④when和while还可作并列连词when表示“就在那时”； while表示“然而”，表前后意思的对比。

状语从句+课件-2024届高考英语一轮复习

5.自然而然接when
状语从句省略
前提：
1. 从句的主语与主句的主语一致； 2. 从句中需有be动词。
省略时需把从句主语和be动词一起省略。
He fell asleep when he was doing his homework. When I was surfing the net, the power was off. His father died when he was only three.
二. 连接词
语气最弱，看到一个现象去反推可能的情况 It must be morning，for the birds are singing.
原因状语从句
常见：because, as, since, for
用法几乎一致，表示直接的原因，as语气稍弱。 As he is too yong, he can’t join the army.
二. 连接词：时间状语从句一... 就....
no sooner... than... I had no sooner seen you than I smiled. hardly... when...
二. 连接词：时间状语从句一... 就....
no sooner... than... I had no sooner seen you than I smiled.
二. 连接词
让步状语从句
1. although，though， as 虽然，尽管 2. even if ， even though 即便，即使 3. 特殊疑问词+ever/ no matter + 特殊疑问词不论
二. 连接词：让步状语从句 3. 特殊疑问词+ever/ no matter + 特殊疑问词不论

高考英语语法必考考点(12)状语从句(含解析)

2019年高考英语语法必考考点（12）：状语从句含解析李仕才【考点解读】在复合句中，修饰主句或主句谓语的句子叫作状语从句。

状语从句可位于主句之前，也可位于主句之后。

状语从句可分为时间、地点、原因、结果、条件、方式、让步、比较和目的等九大类。

一、状语从句引导词列表从句类型从属连词时间状语从句as, after, before, once, since, till, until, when, whenever, while, as soon as地点状语从句where, wherever, anywhere, everywhere原因状语从句because, since, as, now (that), seeing that, considering that, in that 结果状语从句that, so that, so/such ...that ...目的状语从句so that, in order that, for fear that, in case, for the purpose that条件状语从句if, unless, as/so long as, on condition that, in case, provided that 比较状语从句than, as ...as, not so/as ...as方式状语从句as, as if/though, how让步状语从句though, although, even if/though, however, whatever, as, while【点睛】(1)上述有些连词除了能引导状语从句外，还可引导定语从句和名词性从句。

在使用的时候，要根据句子结构和句意来判别和区分不同的从句，正确使用引导词。

以where为例，试比较下列多种从句的区别。

You are to find it where you left it. (地点状语从句)Tell me the address where he lives. (定语从句，先行词为the address)I don’t know where he came from. (宾语从句)Where he has gone is not known yet. (主语从句)This place is where they once hid. (表语从句)(2)在两个分句间要有一个且只有一个连词，千万不能按汉语习惯。

高考英语语法：状语从句

高考英语语法：状语从句一.定义: 在句中作状语的从句就叫做状语从句二.分类: 状语从句包括以下八类1.时间状语从句: 由when, while, as, before, after, since, till / until, as soon as等引导a. I shall tell him the good news when he comes.2.原因状语从句: 由because, as, since, for等引导a. He didn’t hear me because he was listening to the radio.b. Since you are free today, you had better show me how to use the computer.3.地点状语从句: 由where等引导a. Please put the book where it was after you finish reading it.4.条件状语从句: 由if, unless等引导a. I will come to see you if I have time on Sunday.5.比较或方式状语从句: 由than, as, as if, as...as...等引导a. I know you do better th an he does.b. The old worker runs very fast as if he were a young man.6.目的状语从句: 由so that, in order that等引导a. They set out early so that they could arrive at the station in good time.7.结果状语从句: 由so, so that, so / such...that...等引导a. They set out early so that they arrived at the station in good time.b. He finished his work so well that the boss praised him in public.8.让步状语从句: 由though / although, even if, whatever, whoever, whenever, no matter what / who等引导a. He is in very good health though he is old.b. They didn’t stop working even if it began to rain hard.三.应注意的问题:1.时间和条件状语从句中常用一般时代替将来时a. I will go and see a film if I have time tomorrow.b. I will tell the about it as soon as he comes back.c. He said he would go out for a walk when he finished his work.2.状语从句中可有省略: 在一个含有状语从句的复合句中, 如果主句和状语从句的主语相同, 或状语从句的主语是it, 并且状语从句的谓语含有be动词时, 可以将状语从句的主语和be 一起省略掉a. As (she was ) a child, she began to learn English.b. If ( he was ) al ive, he must be at least ninety years old.c. Althou gh ( he was ) told to stop, he kept on working.d. If ( it is) necessary, ring me up.e. He didn’t say a single word unti l ( he was ) asked.3.as和than引导的比较状语从句中, 从句中和主句中相同的部分往往省略, 从句中只剩下比较对象a. He is a head taller than I ( am tall ).than之后的人称代词是主格或宾格时, 有时意思不同, 如:a. She likes the dog more than me.=She likes the dog more than she likes me.她喜欢狗比喜欢我更多b. She likes the dog more than I.=She likes the dog more than I like the god. 她比我更喜欢狗4.含有no soonerthan和hardly / barely / scarcely when的句子相当于含有as soon as引导的时间状语的句子.no sooner或hardly放在句首时, 主谓要部分倒装a. He had no sooner seen the policem an than he ran away. =No sooner had he seen the p oliceman than he ran away. =He ran away as soon as he saw the policemen.b. He had hardly sat down when the telephone rang. =Hardly had he sat down when the telephone rang. =The telephone rang as soon as he sat down.5.immediately, directly, instantly等词也可以作为连词引导时间状语从句, 相当于as soon as引导的时间状语a. I went to see him immediately I heard from him. =I went to see him as soon as I heard from him.6.the moment, the minute, the second引导时间状语从句, 相当于as soon as引导的时间状语a. He let out a cry the moment he saw the snake.=He let out a cry as soon as he saw the snake.7.each time, every time, any time, last time, next time, first time可以引导时间状语从句a. They shake hands with each other each time they meet.8.since引导的时间状语从句中, 若谓语动词是延续性动词或状态动词, 则其过去时表示动作的完成或状态的结束a. It is five years since he lived here. 他不住这里己有五年了a. They shake hands with each other each time they meet.8.since引导的时间状语从句中, 若谓语动词是延续性动词或状态动词, 则其过去时表示动作的完成或状态的结束a. It is five years since he lived here. 他不住这里己有五年了。

2024届高考英语一轮复习语法：状语从句课件

The dog will eat a cake as soon as the cat leaves.
主句
从句
2.地点状语从句
地点状语从句
引导词：where + 强调形式
Wherever，everywhere，anywhere 不管哪里，任何地方，所有地方
2.地点状语从句狗狗在发现蛋糕的地方吃了它。 The dog ate the cake where he found it.
1.时间状语从句在某一时间之中引导词：when while as
when：时间点，“突然”
我到家的时候，狗狗在吃蛋糕。
The dog was eating a cake when I reached home.
e：时间段
我在做饭的过程中，狗狗在吃蛋糕。
The dog was eating a cake while I was cooking.
She is as beautiful as Snow White. 她和白雪公主一样漂亮.
3.比较状语从句
比较状语从句：更…
He is smarter than I. He is smarter than l am.
This cake is bigger than that one. This cake is bigger than that one is.
Because > since > as
因果/语气
原因
because > since > as
状语 because 引导的实实在在的因果关系
从句
since 引导的是众所周知的事实
as 引导的是显而易见的事实

高考英语重要语法知识点“状语从句”全面解析,一定要牢牢掌握!

高考英语重要语法知识点“状语从句”全面解析，一定要牢牢掌握！时间状语从句1.when的用法（1）when既可引导一个持续性动作，也可引导一个短暂性动作，可用于表示主句和从句动作同时发生或从句动作先于主句动作，有时还可表示从句动作后于主句，意为“当..时候”。

（2）when在be about to do..when...be doing..when..had done..when...be on one’s wa...when...be on the point of doing..when..等结构中，作“那时突然”讲。

（3）when “既然、鉴于；尽管，虽然（位于主句之后）；如果”2.while的用法（1）表示“当...时候”，引导的动作必须是延续性的。

（2）用作并列连词，表示相对关系“然而”。

（3）引导让步状语从句，相当于although,意为“虽然”，位于主句前。

（4）引导条件状语从句，相当于as/so long as，意为“只要”。

3.as的用法（1）表示“当...时候”，强调同时发生，不指先后。

（2）说明两种正在发展或变化的情况，表示“随着”，表示时间的推移。

（3）表示“一边...一边..”。

（4）强调两个动作紧接着发生。

（5）表示“虽然，尽管”。

（6）其他含义“正如，正像”，“作为”，“由于，因为”。

4.before的用法（1）一般意为“在..之前”“...才”，“..就”“还没有..”“免得”“不知不觉”“宁可，宁愿”，“否则，要不然”。

（2）It + will be/was + 时间段+before+一般现在时/一般过去时。

在肯定句中，意为“多长时间之后才”；在否定句中，意为“用不了多长时间就”。

5.until和till（1）与肯定句连用，必须是延续性动词。

（2）与否定句连用，必须是非延续性动词，表示“直到..才，在..之前不..”。

注意：not until可用于强调句和倒装句强调句：It is/was not until…that…倒装句：not until 放句首时，主句要部分倒装。

高考英语状语从句语法讲解

高考英语状语从句语法知识点梳理(名师总结基础语法知识点，值得下载)结构图概述时间状语从句的用法：1、2、3、4、5、6、7状语从句地点状语从句的用法：原因状语从句的用法：1、2、3、4 条件状语从句的用法：1、2用法方式状语从句的用法：让步状语从句的用法：1、2、3目的状语从句的用法：结果状语从句的用法：1、2、3 比较状语从句的用法：1、2、3、4、5、6一、概述：状语从句修饰主句中的动词、形容词、副词等，在复合句中作状语。

引导状语从句的关联词是从属连词。

状语从句用陈述句语序，一般位于复合句的句首或句末。

当从句放在主句前面时，常用逗号与主句隔开。

状语从句根据其在句中的不同作用可以分为时间、地点、原因、目的、结果、条件、让步、方式和比较状语从句九种。

二、用法：（一）时间状语从句的用法：1、注意点：⑴在时间、条件状语从句中，谓语动词一般不用将来时态表示将来，而用一般现在时态代替将来时态，用一般过去时态代替过去将来时态，用现在完成时态代替将来完成时态。

如：When he comes here，I will let you know. When I have finished reading the book，I will tell you.⑵if可以引导条件状语从句和宾语从句，引导条件状语从句时，意为“如果，假如”，引导宾语从句时，意为“是否”。

如：If he has any questions，he will come to ask me. Tell me if you will go to school tomorrow.⑶时间、条件、方式、让步等状语从句常常可以转换成省略形式或简单句句子成分。

①when，while，as，if，though，as if等引导时间、条件、方式、让步等状语从句时，若从句和主句的主语一致或主句的主语是it且含有be动词时，可以将从句中的主语连同后面的be动词一起省略。

高考英语状语从句的用法归纳

高考英语状语从句的用法归纳一、概说状语从句即指在主从复合句用作状语的从句。

按照其意义，状语从句可分为时间状语从句、地点状语从句、原因状语从句、目的状语从句、结果状语从句、条件状语从句、让步状语从句等。

状语从句是高中英语学习中的一个语法重点，也是历年高考重点考查的内容之一。

学习状语从句主要应注意引导状语从句的从属连词的用法与区别，以及从属连词在一定的语言环境中的意义与用法。

二、时间状语从句1. 引导时间状语从句的从属连词很多，常见的有before, after, when, while, as, since, till, until, as soon as 等。

2. 表示“当…时候”的 while, when, as 的用法区别是：while从句中的谓语动词必须是延续性动词；表示带有规律性的“每当”或当主、从句谓语动词的动作发生有先后时，只能用 when；当表示“一边…一边…”或“随着”时，只能用 as。

另外，用于此义的 as 所引导的时间状语从句谓语只能是动作动词，不能是状态动词。

如下面一道高考题的答案是 B 而不能是A：“I’m going to the post office.” “_____ you’re there, can you get me some stamps?”A. AsB. WhileC. BecauseD. If3. until 在肯定句中通常只连用延续性动词，表示相应动作结束的时间；在否定句中通常连用非延续性动词，表示相应动作开始的时间，意为“直到…才”。

如：He waited until she was about to leave. 他等着一直到她准备离开。

I did not begin to work till he had gone. 他走了后我才开始工作。

4. 表示“一…就”除用 as soon as 外，还可用 the minute, the second, the instant, immediately, directly, instantly, no sooner…than, hardly…when 等。

高中英语2025届高考语法复习状语从句知识讲解

高考英语语法复习状语从句知识讲解一、概述常见的有although/though/even though引导的让步状语从句。

if/unless引导的条件状语从句。

until/when/while/as soon as引导的时间状语从句。

because引导的原因状语从句，so that引导的目的状语从句等。

if引导的条件状语从句和when引导的时间状语从句一般都会和时态相结合，即主要考查“主将从现”原则。

对于状语从句的学习可与专题六从属连词相结合。

在时间状语从句和条件状语从句中，主句和从句的时态一致问题一般有两种情况：（1）“主将从现”：主句用一般将来时，而从句用一般现在时。

常见的使用“主将从现”原则的连词有：表示时间的when, while, after, before, until, till, whenever, as soon as, as long as, once 等；表示条件的if, unless, so long as, in case等。

（2）“主祈从现”：若主句是祈使句，或主句中有情态动词时，那么从句用一般现在时表示将来。

（3）“主情从现”：若主句有情态动词, 那么从句用一般现在时表示将来。

如：You can get good grades if you study hard.如果你努力学习，你将取得好成绩。

状语从句由从属连词引导,与主句连接,位于句首时,常用逗号与主句分开,位于句末时,其前一般不用逗号。

状语从句根据其用途可分为时间状语从句、条件状语从句、原因状语从句、目的状语从句、结果状语从句、让步状语从句、比较状语从句、地点状语从句等。

二、时间状语从句(1)当主句是一般将来时态或祈使句,表示将来的意义时,从句通常用一般现在时,简称“主将从现”。

I’ll ring you up as soon as I get to Beijing.我一到北京就给你打电话。

(2) when引导的时间状语从句,通常表示主句和从句的动作同时发生;before表示主句的动作发生在从句的动作之前;after则表示主句的动作发生在从句的动作之后;as引导时间状语从句时,往往表示主句和从句的动作同时发生,不分先后。

高考英语语法——状语从句(共39张PPT)

3
before意为“在……之前”，表示从句的动作发生在主句动作之后。 after意为“在……之后”，表示从句的动作发生在主句动作之前。
He had done good preparations before he went to college. After he had tried many times and failed in t=They had hardly fallen in love with each other when they got married.
No sooner had I arrived home than it rained heavily.
8
表示“一……就……”，表示从句动作一发生，主句动作立刻发生。
6
since表示“自从……”，后接时间点，所引导的从句一般要用非延续性动词，主句多用延续性动词和完成时态。
He has worked at this college since he graduated.
since引导的从句若用延续性动词或状态动词的过去时，则表示该动作或状态的完成或结束。
It has been five years since he worked here. 他不在这工作已经五年了。 Since he was at school, he has worked in that city. 自从他下学，他就在这个城市工作。
Until all the lights in the street had been off, the boy went home. He appeared until I waited for a long time.（错） He didn't appear until/before I waited for a long time.（正）

高考英语语法状语从句考点总结

till不能放句首 they had said. 4) It was not until the nineteenth century that Vico's work was given its true recognition.
Not until the nineteenth century was Vico’s work given its true recognition. 正常语序 Vico’s work was not given its true 7 recognition until the nineteenth century.
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2.地点状语从句
比较：
• I will go where he went. • I’ll go wherever he goes.
特定地点不确定地点
There were dirty marks on her trousers ______ she had wiped her hands. (全国卷 A II2004) A. where B. which C. when D. that
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1) because 语气最强，用来回答why提问和用在强调句型中，这时不用as；其他地方不用区分。 2) for也可以表示原因, 属并列连词, 不是说明直接原因,而是对某种情况加以推导，用于表示补充说明理由。for引导的从句不能位于句首He must be ill for he is absent today.
Adverbial Clauses 状语从句
1
状语从句的分类
1.时间状语从句 2.原因状语从句 3.条件状语从句 4.地点状语从句 5.目的状语从句 6.结果状语从句 7.比较状语从句 8.让步状语从句 9.方式状语从句

高考状语从句知识点

高考状语从句知识点状语从句是高考英语中的一个重要语法点，掌握好状语从句对于理解和运用英语句子结构、提高英语语言能力有着至关重要的作用。

接下来，让我们一起深入了解一下高考中常见的状语从句类型及其用法。

一、时间状语从句时间状语从句表示时间关系，常用的引导词有 when（当……时候）、while（在……期间）、as（当……时；一边……一边……）、before（在……之前）、after（在……之后）、since（自从……）、until ／ till（直到……）等。

1、 when 引导的时间状语从句When I was a child, I often played in the park（当我还是个孩子的时候，我经常在公园玩耍。

）When he arrived home, it was already midnight（当他到家时，已经是午夜了。

）需要注意的是，when 引导的从句动作可以与主句动作同时发生，也可以先于主句动作发生。

2、 while 引导的时间状语从句While I was doing my homework, my mother was cooking（当我在做作业时，妈妈在做饭。

）While he was reading, his sister was singing（他在读书时，他妹妹在唱歌。

）while 引导的从句动作通常是持续性的，且主句和从句动作同时发生。

3、 as 引导的时间状语从句As I was walking along the street, I met an old friend（当我沿着街道走时，遇到了一位老朋友。

）As time goes by, we become more mature（随着时间的流逝，我们变得更加成熟。

）4、 before 和 after 引导的时间状语从句I had finished my homework before my father came back（在我爸爸回来之前，我已经完成了作业。

备战2023年高考英语考点一遍过考点27时间状语从句含解析

考点27 时间状语从句高考频度：★★★★★考向一 when/while/as引导的定语从句一、when引导的时间状语从句1. when引导的时间状语从句，其动词既可以是延续性动作的动词，也可以是瞬间性动作的动词，而且可以表示主句的动作和从句的动作同时发生，或者从句的动作发生在主句的动作之前。

When you apply for a job, you must present your credentials. 当你申请工作时，你必须递交你的有关证件。

（同时）When the stude nts heard the teacher’s footsteps, they all atopped talking. 当学生们听到老师的脚步声时，他们都停止了讲话。

（从句动作发生在前）2. when还可表示just then（正在那时，突然）的意思，此时其所引导的从句只放在主句之后。

be about to do ... when ... 正要去做某事，突然……be doing ... when ... 正在做某事，突然……be on the point of doing ... when ... 正在做某事，突然……We were about to start when it began to rain. 我们正要动身，突然天下起雨来。

The game had hardly/scarcely/barely begun when it started raining. 比赛刚刚开始就下起雨来。

二、while引导的时间状语从句while表示＂在某一段时间里＂或＂在……期间＂，其所引导的从句的动作是延续性的，并侧重表示和主句的动作同时发生。

When the teacher paraphrased the text in English, the students listened attentively and took notes. 当老师用英语解释课文时，学生们聚精会神地听并做着笔记。

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上海高考英语语法考点：状语从句在复合句中作状语的从句叫状语从句。

状语从句有时间、地点、原因、目的、结果、条件、方式、比较、让步等种类。

一、时间状语从句引导时间状语从句的连接词有: when, as, while, after, before, since, ever since, assoon as, once, till, until, whenever, no sooner…than, hardly/scarcely...when, the moment/minute/instant/second, every time, each time, any time, the first time, nexttime, last time, all the time, by the time, directly, immediately, instantly等。

主将从现语法规则：时间, 条件、让步状语从句中用一般现在时表将来。

No matter what he is, he will be punished. I will go if you go.的句型1.表示“一···就···”1) as soon as/once As soon as he arrives, I'll call you. “一…就，一旦...”2) on doing sth./on one's + n. On arriving at the station, the thief was arrested.3) no sooner ...than , hardly/scarcely...when，不放句首，不倒装。

No sooner had he reached home than it began to rain.Hardly/Scarcely had I entered the room when the phone rang.4）the moment, the instant, the minute, the secondThe moment I saw him, I recognized him. We'll leave the minute you are ready.5)有些副词如：instantly, immediately, directly可用作连词，后接从句。

I left immediately the clock struck 5.2. when, while, as引导时间状语从句1) when既可指时间点，也可指时间段。

从句动词可以是短暂的也可是延续的，主从句动作可同时也可先后发生。

I was thin when I was a child. It was raining when I arrived.它引导的是并列句when在下列结构中, 译成“这时”，··when, be on one's way ...be about to do ... when, be doing ... when, had done ·when, be on the point of doing ... when2)while只能指一段时间，从句中的动词必须是延续性动词。

强调某一段时间内发生主句动作，相当于during the time that....My mother was cooking while I was doing my homework. I am safe while I am here.while除引导时间状语从句外，还引导并列句，作“然而”讲；并可在句首引出让步状语从句作“虽然···但”讲。

I like watching TV, while he likes reading.While he has his own car, he often uses mine.3)as的用法as引导时间状语从句时常可和when换用，但较强调同时发生，多指短暂动作。

As I left the house, I forgot the key.的意思，表时间的推移。

as还可说明两种正在发展或变化的情况，“随着...”As I get older, I get more optimistic.as表“一边…一边…”，引出伴随动作。

He hurried home, looking behind as he went.用以强调两个动作紧接着发生。

As he was going out, it began to rain.as有时引出一个名词，相当于一个时间状语从句。

As a boy (when he was a boy), he was hopeless at maths.3, before引导的时间状语从句1)before引导的时间状语从句不用否定式谓语。

Before they got to the bus stop, the bus had gone.2)在“It be + 时间段+ before从句”句型中，译成“…才”，“…就”。

It will be many years before the chemicals start to escape from the containers.It was not long before he came back.It was a week before he could tell his story.It wasn't long before he told us about himself.3)before可译成“未来得及”　He had measured me before I could get a word.4)before可译成“趁着还没”　I'll write it down before I forget.4, until和till表示“动作延续到…为止，”译为“直到…为止”，1)“延续性动词肯定式+until”I waited for him until he came back.表示“直到···才”。

2)“终止性动词的否定式+ until”He didn't go to bed until he had finished his work.3)用于强调句式“It is not until ...that ...”It was not until the professor came that we began the experiment.4)not until放在句首时，主句倒装。

句首和强调句中要用until，而不用till；not...until...句型中不用till。

5, since引导时间状语从句，意为“自从…时起”，主句要用完成时。

二、地点状语从句1, 地点状语从句主要由where, wherever anywhere, everywhere引导。

We must camp where we can get water. I will follow you wherever you go.2, 地点状语从句与定语从句的区别：where引导定语从句，从句前应有一个表示地点的名词作先行词。

Go back where you came from.（where引导地点状语从句）Go back to the village where you came from.（where引导定语从句）三、原因状语从句原因状语从句由because, as , since, now (that)（既然）, in that（因为，多于口语中）,seeing (that)（鉴于，由于）,considering that（考虑到）等引导。

1, because用来回答why的问题，表直接的因果关系，语气最强，可用于强调句。

It was because he was ill that he didn't go with us.because是连词，引导从句，because of是介词短语。

2, since, as, now that引导的原因状语从句，不能用于强调句。

since的语气比because稍弱，表示关系上的自然结果，特别用于原因已经清楚了的事情，一般译成“既然，鉴于”（往往放在主句之前）Since you have known the secret, I needn't say anything about it.3, as语气最弱，说明一般的因果关系，表显而易见的原因或倒果为因的说法，可放在主句之前，亦可放在主句之后。

As the ground is wet, it must have rained last night.（倒果为因）4, now that用来说明一种新情况，然后加以推论。

now that放句首时that可省略：Now (that) everybody is here, let's begin.5, for也可以表示原因，属并列连词，不是说明直接原因，而是对某种情况加以推断，表示补充说明理由。

而推断的理由会因人而异。

语气很弱，一般后置。

He must be ill, for he is absent today.6, 原因状语从句有时可以用分词形式表现。

As he was blind, he couldn't see anything. Being blind, he couldn't see anything.四、条件状语从句1, 由if, unless（if...not）, so/as long as, supposing(that)（假设）, in case（万一…, 以防…）, so/as far as（就...而言）, on condition that（条件是...）, provided/providing (that)（假若）引导。

I won't go unless I'm invited.Take an umbrella with you in case it rains.You may use the room as/so long as you clean it up afterwards.祈使句+and/or/or else/otherwise+陈述句”的句型中，相当于条件状语从句。

2, “Use your head, and you'll find a way. Hurry up or else (otherwise) you’ll be late. 3, if only也可以引导条件状语从句, If (only) it clears up, I will go.If only he had told me last week, I would have given him some help.4，条件句中的虚拟与倒装1）if引导的条件状语从句若与过去或现在事实不符，或对未来进行不可能的假设，就要用虚拟语气。