高中英语状语从句用法解析 一、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。 二、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 （一）引导时间状语从句的连词有：as, when(whenever), before, after, as soon as, until(till), since, every time, once. （二）、“as” as, when, while都有“当……的时候”，可以互用 When she was a child. While she was a child. She Lived in Paris. As she was a child. as有“一边…一边”的意思 He sang as he walked. “when” When the clock struck twelve, all the lights went out. I was sleeping when she came in. 动补 When we arrived at the station, the train had left. “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。 While we were having supper, all the lights went out.
时间状语从句 要点: 时间状语从句，由以下连词引导： when while as after before as soon as since till /until by the time 在时间状语从句中，要注意时态一致。一般情况下主句是将来时的时候，从句要用一般现在时。 当。。。的时候 mozart started writing music when he was four years old. (当)莫扎特的时候，开始写音乐作品。 当。。。时 he visited a lot of places while he was traveling.他在旅途中参观了许多地方。 在。。。的同时；一边。。。一边。。。 he smiled as he stood up.他一边站起来一边笑着。 在。。。之后 he left the classroom after he had finished his homework the other day. 前几天做完作业之后回的家。 在。。。之前 mr. brown had worked in a bank for a year before he came here. 布朗先生来这之前已经在一家银行里工作一年了。 soon as 一。。。就。。。(主将从现) we began to work as soon as we got there.我们一到那就开始工作。 i will write to you as soon as i get home.我一到家就给你写信。 自。。。以来到现在 表示自过去的一个起点时间到目前(说话时间)为止的一段持续时间。主句一般用现在完成时，从句用一般过去时。 mr green has taught in that school since he came to china three years ago. 自格林先生来中国以来，他就在这所学校教书。 (还可以用作介词，本句从句还可以用短语：since three years ago(自三年前以来)表示。) 8 till /until都可以作连词，连接时间状语，也可以作介词，与其它词构成介词短语，在句中作状语。 they walked till /until it was dark.他们一直走到天黑。 xiao ming didn’t leave home till / until his father came back.小明直到他爸爸回来才离开家。 9. by the time 到。。。为止 (所在句子的主句应用完成时) by the time he gets there , his father has already gone.他到家的时候，他爸爸已经走了。 by the time i got to school, the class had already began.我到校时，已经开始上课了。 难点——as when while的辨析 as when while都表示主、从句动作同时发生，三者差异如下： as 表示“一边。。。一边＂的意思 强调两个动作同时进行，并表示对比时 when 1、还可以表示从句动词的动作在主几句动词的动作＂之前＂或＂之后＂发生。 2、when＝and then; at that moment (正在那个时候)
高考英语状语从句专项讲解 一、考点分析 状语从句主要考点在语法填空、翻译和作文。 二、专题详解 状语从句梳理 知识点1：分类 语从句可以分为以下九种： 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、结果状语从句 6、条件状语从句 7、方式状语从句 8、让步状语从句 9、比较状语从句 知识点2：具体用法 1) 时间状语从句：
as soon as Hardly/scarcely had…when No sooner had …than…. the moment.. the instant…the second…immediately directly…instantly…①As soon as I arrive in Shanghai, I’ll write to you.我一到上海就给你写信。 ② Hardly (scarcely) had I got home when it began to rain. 我刚一到家就下雨了。 ③No sooner had we got to the station than the train left. 我们刚到车站，火车就走了。 ④We had just begun the moment we were told to stop. 我们刚开始就被叫停。 ⑤I felt cheerful immediately I heard the song. 我一听到这首歌就感到很愉快。 ①hardly…when和no sooner…than的意义相当 于as soon as，但只表示过 去发生的事情，主句为过去 完成时，从句为过去时，如 hardly或no sooner位于句 首时语气强，而且主句的谓 语要用部分倒装。 ②名词短语连词： “一……就……” 主句+ the moment…从句 主句+the instant…从句 主句+the second…从句 ③ 副词短语连词： 主句+ immediately +从句 主句+ directly +从句 主句+ instantly+从句 every time =each time last time…next time…the first time ①Every time I traveled by boat, I got seasick. 我每次乘船都晕船。 ②Last time we saw you,you were too thin. 上次我们见到你的时候，你太瘦了。 every time=each time “每次……；每当……” last time…“上次……” next time…“下次……” the first time“第一次……”
中考英语状语从句专题(含答案) 一、初中英语状语从句 1．—I don ' t know if Sam tomorrow. —Don't worry. I will tell you as soon as he . A．will come; comes B．comes; will come C．will come; will come D．comes; comes 【答案】A 【解析】 【详解】 句意：——我不知道萨姆明天是否会来。——别担心，他一来我就告诉你。 第一个句子为if引导的宾语从句，根据从句中的时间状语tomorrow判断，从句的时态为一般将来时，排除B,D；第二个句子是as soon as引导的时间状语从句，遵循“主将从现”的原则，本句的主句是一般将来时，as soon as引导的从句要用一般现在时，故答案为A。 2．We don’t know the love of our parents ____________ we become parents ourselves one day. A．before B．until C．when D．after 【答案】B 【解析】 【详解】 句意：直到有一天我们自己成为父母，我们才知道父母的爱。考查连词辨析。before在……以前；until直到，和not连用表示“直到……才”；when当……的时候；after在……以后。本句是“not …until”结构；根据句意结构和语境，可知选B。 3．The nurse won’t leave her patients ______ she’s sure somebody else takes good care of them. A．if B．because C．since D．unless 【答案】D 【解析】 【详解】 句意：这个护士如果不确定其他人照顾她的病人，她不会离开他们。if如果，引导条件状语从句用一般现在时，主句用一般将来时；because因为，since自从，引导时间状语从句，主句用现在完成时；unless除非，如果不，引导条件状语从句用一般现在时，主句用一般将来时；结合句意，如果她不确定有人照顾病人，她不会离开。故选D。 4．__________ you have tried it on, you can’t imag ine how pretty the new style skirt is. A．Because B．Although C．Unless D．When 【答案】C 【解析】 本题的含义是如果你不尝试一下，你将不能想象一下这件新款式的裙子有多么漂亮，unless表示如果不的意思，故本题选C。
连词与状语从句 一、单项选择（共25小题；共25分） 1. The foreign woman can't speak French Japanese. A. so B. nor C. but D. or 2. It's four years I came to Shanghai. A. before B. when C. since D. as 3. It was a nice meal, a little expensive. A. though B. whether C. as D. since 4. John fell asleep he was listening to the music. A. after B. before C. while D. as soon as 5. You'd better do it your mother did. A. when B. as C. like D. because 6. We have been good friends we joined the same ping-pong team. A. after B. before C. since D. until 7. Help others whenever you can you'll make the world a nicer place to live in. A. and B. or C. unless D. but 8. I hardly knew anything about it you told me. A. since B. after C. until D. when 9. --- How do you like this skirt? --- It's beautiful and it fits me well, I like it very much. A. but B. for C. so D. since 10. --- What do you think of the book Harry Potter? --- I like it very much. It's interesting exciting. A. neither; nor B. not; but C. not only; but also D. either; or 11. Mary was riding her bicycle to the park she was hit by a car. A. when B. after C. until D. since 12. Study hard, you won't catch up with your friends. A. but B. or C. and D. so 13. You should make a good plan you do anything important.
（1-30 高二英语寒假班讲义用31-60 高二英语春季班讲义用） 1.___ hard he tries, he never seems able to do the work successfully. A. Whatever B. However C. Whichever D. Whenever 2.We have to be patient. It will be some time ___ we get the full result. A. since B. that C. before D. after 3.She lied to us ___ she had to ___ a job. A. what; to get B. because; get C. because; in order get D. all; get 4.I was about to go out ___ the telephone rang. A. then B. when C. suddenly D. so 5.This equipment is so old ___ it can't be used any more ___ some of its parts are changed. A. as; unless B. that; unless C. that; if D. whether; or 6.I'll tell you the result of the test ___ I know it. A. because B. the moment C. though D. for 7.You can't go out to play ___ you finish your homework. A. if B. because C. unless D. when 8.I was late today ___ there was something wrong with my bike. A. since B. as long as C. because D. when 9.You can't waste natural resources ___ you have much of them. A. as if B. even if C. when D. if 10.Please speak clearly ___ we can follow you. A. so…that B. so C. so as to D. so that 11.___ you have made a decision, don't change it frequently. A. Once B. Before C. While D. Even if 12.He used to tell children the story ___ he had had the experience. A. as though B. even if C. even though D. like 13.He came to help us ___ he had plenty of work to do. A. as B. while C. although D. whenever 14.___, he knows how to live and study. A. A child as he is B. As he is a child C. Child as he is D. Though he is child 15.We found people friendly ___ we went. A. to which B. in which C. wherever D. to where 16.___ the weather is fine, I'll open all the windows. A. Now that B. Since that C. Because of D. For 17.It was ___ he couldn't finish it by himself. A. so difficult a work as B. such a difficult work as C. so difficult work as D. such difficult work that 18.___ I know, this book will be used as a text book. A. So far as B. So far C. So long as D. As to 19.He had disappeared in the darkness ___ I saw who he was. A. before B. after C. till D. while 20.We'll build a power station ___ water resources are plentiful. A. where B. in which C. which D. that 21.___ we don't lose heart, we'll find a way to overcome the difficulty.
初中英语状语从句知识点总结（一） 用来修饰主句中的动词，形容词或副词等而充当状语的从句叫做状语从句。状语从句常用从属连词来引导，与主句连接起来。若置于句末，则前面不加逗号。根据意义和作用，状语从句可分为时间原因条件等几种。下面我们就来分析一下这几种状语从句。 1时间状语从句 时间状语从句常用从属连词when,after,until,as soon as,等来引导。 当主句是祈使句或谓语动词是一般将来时态或情态动词时，其时间状语从句中的谓语动词常用一般现在时态表示将来发生的动作或存在的状态。这就是我们常说的“主将从现”。 如：Please call me when you get there.当你到那时，请给我打个电话。 I will write to you as soon as I arrive in Beijing.我一到北京就给你写信。 <温馨提示>since引导时间状语从句表示“自从…以来”，从句中的动词一般表示动作的起点，用过去时;而主句的动作延续的情况则用一般现在时或现在完成时。常用的句型为： It has been/is+一段时间+since+过去时。 如：I has been/is three years since we met last time.自从我们上次见面，已经三年了。 2条件状语从句 引导条件状语从句的连词或词组有：if(如果),unless(除非),as long as(只要)等。如果主句是将来时，条件状语从句也用一般现在时来表示。 如：I will stay at home if it rains tomorrow.如果明天下雨，我就待在家。 You can’t learn English well unless you wo rk hard. 除非你努力学习，否则是学不好英语的。 <温馨提示>由if引导的条件状语从句，若从句表达的是与现在事实相反的事实，则常用虚拟语气，即用过去时态表示(如果涉及到be动词，一律都用were)。此时，主句则用过去将来时。
高一英语状语从句专题练习 一、单句填空 1. Mr. Smith has learned some Chinese ______ he came to Shenzhen. 2. If you work with a strong will, you will overcome any difficulty, _____ great it is. 3. A new school was built ______there had once been a wasteland. 4. ______ you’ve got such a golden chance, who not make the best of it? 5. A whole month had passed _______ she fully recovered. 6. You mustn’t leave _______ you get your work done by 6 o’clock. 7. Please keep reading the poem _______ you have remembered it. 8. I wo n’t tell him the correct answer ________ I know it. I don’t like him. 9. He was walking _______ he was drunk. 10. _______ the day went on, the weather got worse. 11. _______ I like Chuan food, I won’t visit that restaurant today. I’d like to try a different one. 12. Roses need special care _______ they can live through winter. 13. You will succeed in the end _______ you give up halfway. 14. It is almost 16 years _______ I last met Sarah. 15. I got up early _______ I might not miss the first bus. 16. The baby may be saved _______ he is sent to hospital in no time. 17. ________ he is rich enough, still he spends very little on clothes and food. 18. I didn’t know what happened. He had rushed out of the room ___ I could ask him. 19. You won’t get your ba sketball back ______ you have promised not to play in my garden anymore. 20. It was not yet 7 o’clock ______ he came back.
高中状语从句讲解+练习 状语通常由副词、介词短语、动词不定式、分词和从句等担当。例如： 1. Naturally , our grandparents were pleased to get our phone call . (副词) 2. We worked hard , from sunrise to sunset . (介词状短语) 3. To help my disabled aunt , I spend an hour working in her house every day . (不定式) 4. Seen from a distance , the farmhouse looked deserted . (过去分词) 5. I know how to light a camp fire because I had done it before .（原因状语从句） 状语从句主要用来修饰主句或主句的谓语。一般可分为九大类，尽管种类较多，但由于状语从句与汉语结构和用法相似，所以理解和掌握它并不难。状语从句的关键是要掌握引导不同状语从句的常用连接词和特殊的连接词即考点。现分别列举如下: 1．时间状语从句 常用引导词：when, as, while, as soon as, while, before, after, since , till, until 特殊引导词：the minute, the moment, the second, the instant, immediately , directly, every time, the day，no sooner …than, hardly …when, scarcely …when （1）Tell him I need to see him the minute he arrives. 他一到就告诉他我要见他。 （2）The children ran away from the orchard(果园) the moment they saw the guard. The moment he saw me, he ran away. 他一看见我，就跑了。 He said he’d call you the moment he got home. 他说他一到家就给你打电话 （3）The instant I saw him, I knew he was the man from the restaurant. （4）Immediately you begin to speak, he gives you his full attention.你只要一开始说话，他就全神贯注地听。 （5）My sister came directly she got my message. 我妹妹一收到我的信息就来了。 （6）Every time I listen to your advice, I get into trouble. （7）no sooner... than... ，"一...就..." ，引导时间状语从句,主句用过去完成时,"than"后面的从句用一般过去时.(从这里可以知道,no sooner后面是主句;than后面是从句) 例: I had no sooner reached home than it began to rain. 我一到家天就下起雨来 No sooner ...than...常放在句首,表示强调.这时主句要倒装. 例:No sooner had I reached home than it began to rain. （8）He had hardly sat down when the telephone rang.他刚坐下电话就响了。 He had scarcely sat down when there was a knock at the door. 他刚坐下就有人敲门 另外，如果把hardly放于句首，主句要用倒装结构。如： Hardly had I finished eating when he came in. 我刚吃完他就进来了。 2．地点状语从句 常用引导词：where 特殊引导词：wherever, anywhere, everywhere Generally, air will be heavily polluted where there are factories. She was standing exactly where you are standing now那时他就站在你现在站的地方。 Stay where you are.呆在原地别动。 Wherever you go, you should work hard. Sit anywhere you like 随便坐吧 3．原因状语从句
中考英语状语从句专项训练及答案 一、初中英语状语从句 1．We don't know the love of our parents _______ we become parents ourselves one day. A．until B．after C．when D．since 【答案】A 【解析】 句意：直到有一天我们成为父母，才知道父母的爱。本题考查连词。A. until到…为止，在…以前; 直到…才;B. after在…以后;C. when当···时候；D. since自从; 从…以来; Not until 直到···才···；不到···不···，是固定搭配，故选A。 2．—I see Bob, he’s always listening to music. —Yeah, he’s crazy about it. A．Whenever B．Although C．Since 【答案】A 【解析】 【详解】 句意“-无论我什么时候看到鲍勃，他总是在听音乐。-是的，他对音乐很疯狂”。A.无论何时（引导时间状语从句）；B.尽管（引导让步状语从句）；C.自从（引导时间状语从句）。根据句意可知，译为“无论何时”，故选A。 3．—The novel seems a little boring. —You won’t enjoy it _______________ you put your heart into it. A．when B．if C．after D．unless 【答案】D 【解析】 试题分析：句意：--这部小说似乎有点儿无聊。--如果你不用心读的话，你不会享受到这本书。when，当……的时候；if如果；after在……之后；unless，如果不，除非。结合句意，故选D。 考点：考查连词的用法。 4．He doesn't tell me when he_______ . I'll telephone you as soon as he______. A．will come;comes B．will come; will come C．comes; will come D．comes; comes 【答案】A 【解析】 试题分析：句意：他没告诉我什么时间回来。他一回来我就告诉你。宾语从句中表示将
初中英语状语从句讲解 1.时间状语从句 2. 条件状语从句 3. 原因状语从句 4. 结果状语从句 5. 比较状语从句 6. 目的状语从句 7. 让步状语从句 8. 地点状语从句 2.用来修饰主句中的动词，副词和形容词的从句叫状语从句。根据其含义状语 从句可分为时间状语从句，地点状语从句，条件状语从句，原因状语从句，结果状语从句，比较状语从句，目的状语从句，让步状语从句。 1. 时间状语从句 (1)时间状语从句常用when, as, while, before, after, since, till, until, as soon as等连词来引导。例如： It was raining hard when got to school yesterday. While he was doing his homework, the telephone rang. As he walked along the lake, he sang happily. He had learned a little Chinese before he came to China. After he finished middle school, he went to work in a factory. (2)在时间状语从句里，通常不用将来时态，用现在时态表示将来的动作或 状态。例如： I’ll ring you up as soon as I get to New York. I will tell him everything when he comes back. He won’t believe it until he sees it with his own eyes. (3)在带有till或until引导的时间状语从句的主从复合句里，如果主句用 肯定式，其含义是“一直到……时”，谓语动词只能用延续性动词。如果主句用否定式，其含义是“直到……才……”, “在……以前不……”, 谓语动词可用瞬间动词。例如： The young man read till the light went out. Let’s wait until the rain stops. We won’t start until Bob comes. Don’t get off until the bus stops. 2. 条件状语从句 (1)条件状语从句通常由if, unless引导。例如： What shall we do if it snows tomorrow? Don’t leave the building unless I tell you to. (2)在条件状语从句里，谓语动词通常用现在时态表示将来的动作或状态。 例如： I’ll help you with your English if am free tomorrow. He won’t be late unless he is ill.
高中英语定语从句 1.掌握必修五M5的语法知识点及其常见考点、命题规律 ★考点一:时间状语从句 Sorry,I was out when you called me. 对不起,你给我打电话时我刚好在外面。 考点延伸 1)阅读下列句子,体会连词的含义 ①She gets very bad-tempered when she’s tired. 她累的时候就爱发脾气。 连词: 含义: ②Please be quiet while I’m tal king to you. 我和你说话时,请保持安静。 连词: 含义: ③We always sing as we walk.我们总是边走边唱。 连词: 含义: ④The stranger waited till my master came home. 那个陌生人一直等到我主人回家。 连词: 含义: ⑤I’ve earned my own l iving since I was seven. 从7 岁起我就自己养活自己。 连词: 含义: 2)阅读下列句子,注意连词until (till)的用法 ①Continue in this direction until you see a sign. 一直朝着这个方向走,直到你看见指示牌。 用法:until (till)直到……时(为止)。till多用于口语,不置于句首;until可以置于句首。在肯定句中,主句谓语动词为延续动词。 ②Don’t open it till your birthday. 等到你生日那天再打开。 用法:在否定句中,构成not...until/till结构,表示“直到……才……”,主句谓语动词为终止动词。 ③Not until we pointed out their fault to them did they realise it. 直到我们向他们指出了他们的错误,他们才意识到。
【英语】人教版中考英语状语从句 一、初中英语状语从句 1．We all know that we won't enjoy good health ______ we often exercise. A．though B．if C．when D．unless 【答案】D 【解析】 【详解】 句意：我们都知道如果我们不经常锻炼，我们将不会享有好的健康。考查连词的用法。A. though虽然，尽管；B. if如果；C. when当......的时候；D. unless除非，如果不。根据句意：我们都知道如果我们不经常锻炼，我们将不会享有好的健康。只有D项符合题意。故选D。 【点睛】 主将从现是指在时间状语从句和条件状语从句中，如果主句是一般将来时，从句用一般现在时替代一般将来时。 常见的有以下四种情况： 一、条件状语从句的主句是一般将来时，那么从句常常用一般现在时 如：When I grow up, I’ll be a nurse and look after patients 我长大后要当一名护士，照顾病人 二、如果主句是祈使句，那么从句通常要用一般现在时 如：Don’t laugh at me when I make a mistake. 我犯错误的时候不要笑话我。 三、如果主句是含有情态动词的一般现在时，根据需要从句多用一般现在时 如：You should be quiet when you are in the reading room 在阅览室时应保持安静 四. 如果if的条件状语从句遇到变换间接和直接时 , 祈使句应用not to.... 如; She said not to close the window 常见的时间状语从句的连词有：as soon as,when,while ,as,until等。 2．I will go to the English club tomorrow I am too busy. A．since B．if C．unless D．until 【答案】C 【解析】 【详解】 句意：明天我将会去英语俱乐部，除非我太忙。since自从；if如果；unless除非，如果不；until直到…时候。根据句意可知，这里表示的意思是“如果我不忙，我会…”，故应选C。 3．—Leonardo didn't win an Oscar he acted in The Revenant（荒野求生）. 一Yeah. It was hard for him to realize this dream, but he never gave up.
典型例句突破状语从句 前言：学习状语从句的几个关键点1）引导状语从句的连词及意思2）状语从句与主句的时态照应3）有关状语从句的重点句型。4）状语从句的省略 一．各种状语从句的典型例句 1．条件状语从句： 1）Let'sgooutforawalkunlessyouaretootired.(除非,若不；相当于if—not) 即：Ifyouaretootired,we’llnotgooutforawalk. 2）Youmayborrowmybookaslongasyoukeepitclean.(只要，表示条件的唯一性) 3）Takeyourumbrellaincaseitrains.（以防—，以免—） 4） 5） 6）假如, 7） 2. 1） 2） 动词， 3） 4） 5） 6） 7） 8） 9） 动词) 10） ，etc.) 14)AssoonasIreachCanada,Iwillringyouup.(一—-就—) 15)Hehadnosoonerarrivedhomethanhewasaskedtostartonanotherjourney.(一—-就—,另外有hardly/scarcely—-when—) 16)Bythetimeyoucameback,Ihadfinishedthisbook.(“到—时为止”，从句是一般过去时，主句是过去完成时。) 17)Bythetimeyoucomeheretomorrow,Iwillhavefinishedthiswork.(“到—时为止”，从句是一般现在时，主句是将来完成时。) 18)EachtimehecametoHarbin,hewouldcallonme.(“每当—的时候”或“每次”，复习eachtime,everytime和whenever) 3．有关时间状语从句的重点句型
中考初中英语状语从句分类及例句 考试要求： 状语从句概念： 用一个句子(从句)来作另一个句子(主句)的状语，用作状语的句子就叫作状语从句。作什么样的状语就叫什么类型的状语从句。引导状语从句的连接词是从属连词，状语从句可以在句首，也可以在句尾。 中考主要考查状语从句的类型有： 时间状语从句、地点状语从句、原因状语从句、结果状语从句、目的状语从句、条件状语从句及比较状语从句等。 1. 时间状语从句： 时间状语从句在主句中表示时间，常用连接词有：when（当……时），while（当……时），as（当……时），before（在……之前），after（在……之后），since（自从），not…until（直到……才）， as soon as（一……就），once（一旦……就）等。 例如： I didn’t go to bed until I finished my homework. 我直到做完作业才去睡觉。 I can listen to the radio while I work. 我可以边听收音机边工作。 (1) 时间状语从句中，一般要用一般现在时代替一般将来时，一般过去时代替过去将来时。例如： I will telephone you when he comes. 他来时，我会给你打电话。 I’ll stay here until you come back. 我会呆在这里，直到你回来。 (2) when引导时间状语从句，表示主句的动作和从句的动作同时或先后发生，从句的谓语可以是延续性动词，也可以是瞬间动词。
例如： He was working when I went in. 我进去时他正在工作。 When she heard the news, she began to cry. 她听到这个消息，她哭了起来。 (3) while引导的状语从句中常用延续性动词或表示状态的动词，意思是“在……期间”。 while还可以表示两者之间的对比关系。 They rushed in while we were singing. 我们唱歌时，他们冲进来。 I like playing football, while Tom likes listening to music. 我喜欢踢足球，而汤姆喜欢听音乐。 (4) as引导状语从句，强调同时发生，不分先后。可以译成“随着”或“一边……一边”。 例如：John sings as he walks home. 约翰一边往家走一边唱歌。 (5) since引导状语从句，主句常用现在完成时，从句常用一般过去时。 We have been friends since we met in Beijing. 自从我们在北京遇到就一直是朋友。 It has been six years since she left school. 自从她毕业已经有六年了。 (6) until/ till 引导时间状语从句，当主句的谓语动词是瞬间动词时，主句常用否定形式，not… until意思为“直到……才”。 He didn’t go to bed until he finished his homework. 他直到做完作业才睡觉。 2．地点状语从句：