(完整)初中英语宾语从句教案
授课教案
班级：初三课程：英语教师：吴老师日期：2015/12/19
初中英语时间状语从句讲解及练习
语法 29时间状语从句 一、什么是状语从句 状语就是在一句话中表示该句子的时间、地点、方式、原因、条件等成分。状语从句就是用一个从 句表示状语。状语从句根据它表达的意思不同，可分为时间、地点、原因、目的、结果、条件、方式、比较、让步等九类。 与状语一样，状语从句的位置比较灵活。既可置于主句之前（通常用逗号与主句隔开），也课置于主句之后（不需要用逗号与主句隔开），有时甚至可以置于主句之中。 二、时间状语从句 1. 主句和从句同时发生，这类从句由从属连词when, while, as引导。 He was hungry when he came home. I was crying while everyone was laughing. As I walked out, he walked in. as, when, while, 的区别 ① as强调从句的动作与主句动作同时发生及持续，具有at the same time的意思 他继续往下谈的时候，越来越兴奋。 as还可以表示一边??一边??，强调从句和主句中两个动作交替进行或同步进行。 他们边走边聊。 as还有“ 随着”的含义 随着春天的到来，天气暖和起来。 ② when 强调动作点的特定时间，具有at the time that 的意思 当老师走进来的时候，我们都站起来了。 ③ while 表示较长的期间，具有during the time that 的意思 当我在这的时候，我很安全。 2.主句发生在从句之前，这类从句由从属连词before, until 引导 ,before 意为“ 在---之前” until 在肯定句中意为“直到 --- 为止”，在否定句中意为“直到 --- 才”。从句既可置于主句前，也可置 于主句之后。 回家之前我必须干完所有的活。
高一英语宾语从句公开课教案
课题：Grammar:Objective clause I. Teaching aims: A.Knowledge aims By the end of the lesson, Ss will have a better understanding of the objective Ss will grasp the usage of introductory words: that、if、whether，what etc, the tense and word order, etc. B. Ability aims Enable students to identify what is the objective clause and learn to use different kinds of introductory words C. Affection aims Develop students’ interest of learning grammar. ] II. Teaching important points Explain the three important aspects of the objective clause: the introductory words, tense and sentence order. Besides, explain the usage of 3 introductory words：that, if, whether.,what,etc difficult points How to choose the introductory words correctly and appropriately in the objective clause IV. Teaching methods teaching and learing , practicing，discussing Teaching tools: 、 The multimedia and other normal teaching tools V. Teaching procedures
初中英语状语从句讲解、练习与答案(教案)
状语从句 状语从句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 ⑴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 ( rain hard 下大雨) when got to school yesterday. While he was doing his homework, the telepho ne rang. As he walked along (沿着走) the lake, he sang happily. He had lear ned a little Chin ese 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 everyth ing whe n 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 (熄灭) Let ' s wait until the rain ops. We won' t start until Bob comes. Don' get off (从下来) until the bus stops. 【Till是指直到某一特定事件发生的时候，而在那个时刻之后，该事情或状况仍将持续。Until是指直到某一特定事件发生的时候，而讲话的人在自己心里认为，在那个时刻之后，该事情或该状况将中止 (不怎么可能持续)。固定组合里from morning till night，till/until是不能替换的，】 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 buildi ng uni ess 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 uni ess he is ill. (3) 祈使句+ and (or)+陈述句”在意思上相当于一个带有条件状语从句的复合句。例如： Hurry up, or you ' ll be late. =If you don ' t hurry up, you ' ll be late. Study hard and you will pass the exam. =If you study hard, you will pass the exam. 3. 原因状语从句
初中英语语法——If引导的条件状语从句(讲解及练习)
条件句从句主句 真实一般现在时一般将来时 情态动词+动原祈使句 非真实 一般过去时 be动词用（were） would/could+动原初中英语――条件状语从句（讲解&练习） Ⅰ条件状语从句的定义 Ⅱ条件状语从句的引导词 1.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。 If we pay much attention to the earth, we'll have a better world. 如果我们多关爱地球，就会拥有一个更美好的世界 If it rains tomorrow, what shall we do? 如果明天下雨，我们怎么办？ 注意：if还可以引导虚拟条件句，表示不可实现的条件，从句中多用一般过去时或过去完成时。 What would happen if there were no water ? 如果没有水会怎样？ 2.unless引导的条件状语从句，unless的意思是如果不，除非。可与if...not互换。 You will fail in English unless you work hard. 你英语考试会不及格的，除非你更加努力。 3.as /so long as引导的条件状语从句：as /so long as意思是“只要” So long as you're happy,i will be happy. 只要你高兴，我就高兴。 Ⅲ条件状语从句的种类 Ⅳ条件状语从句的时态原则 用法例句 ①主句为一般将来时态，if从句用一般 现在时态（即主将从现）。We will stay at home if it rains tomorrow. 如果明天下雨，我将要呆在家。 ②主句中含有情态动词，if从句用一 般现在时态。If you finish your homework, you can go home now.如果你做完了作业，你现在可以回家了。 ③主句为祈使句，if从句用一般现在 时态。Don’t jump into the river if you feel very hot. 如果你感到很热，不要跳入河里。 ④主句为过去将来时，if从句用一般 过去时态（如果涉及到be动词， 一律都用were）。此时，表达的是和现实相反的推测，用虚拟语 气。If I were you, I wouldn’t do it like that.如果我是你，我就不会那么做的。 If you gave me some money, I would be very happy. 如果你给我一些钱，我就会很高兴的。 二、if 引导的条件状语从句 （1）“if 从句+祈使句”的句子。其实，if 作为一个连词，主句也可以是其他形式的句子。 例如：If you want to go, please let me know. (2)“祈使句 + and (or)+ 陈述句”
中考英语 宾语从句 公开课教案
课题：The Revise of the Object Clause Teaching plan Teacher : Teaching time: March 13th, 2015 Teaching place：Chihe Middle School Class1, Grade9 Teaching contents: Object clause Teaching type: Grammar I. Teaching Aims A. Aims of Knowledge By the end of the lesson, Ss will have a better understanding of the object clause. Then Ss will grasp the usage of 3 introductory words: that、if、whether，the tense and word order, etc. B. Aims of Ability Enable students to identify what is the object clause and learn to use different kinds of introductory words C. Aims of Emotion Develop students’ interest of learning grammar. II. Teaching important points Explain the three important aspects of the objective clause: the introductory words, tense and sentence order. Besides, explain the usage of 3 introductory words：that, if, whether.. III.Teaching difficult points How to choose the introductory words correctly and appropriately in the objective clause IV. Teaching methods Combine the inductive method with the deductive method. V. Teaching aids textbook, multimedia and chalks VI. Teaching procedures Step 1 Warm up
【英语】初中英语状语从句试题经典
【英语】初中英语状语从句试题经典 一、初中英语状语从句 1． the journey was tiring，Jeff thought it was worth both the time and the money. A．As B．Since C．Unless D．Although 【答案】D 【解析】 【详解】 句意：虽然旅途很累，杰夫认为时间和金钱都值得。 A. As当……的时候； B. Since 自从； C. Unless除非； D. Although尽管。根据下文Jeff thought it was worth both the time and the money.可知上文是让步状语从句，这里用Although引导。根据题意，故选D。 2．-- Can’t I park my car free here? -- You can, for four hours, __________ you spend over 100 yuan in this supermarket. A．though B．if C．unless 【答案】B 【解析】 【详解】 句意：-我不能把车免费停在这里吗？- 如果你在这家超市花费超过100元，你可以免费停车四个小时。though 虽然；if 如果；unless 除非。这里是形容一种条件，如果消费超过100元，就能免费停车，故选B。 3．My English teacher has taught English she came to the school. A．since B．as C．when D．for 【答案】A 【解析】 【详解】 考查连词辨析，句意：我的英语老师自从来到这个学校就教英语．结合语境推断句意是"我的英语老师自从来到这个学校就教英语．"，此句中的谓语动词用了现在完成时，本题设空处后面的时间状语从句用了一般过去时，所以结合句意用现在完成时的标志词since引导，故选A 4．He made a serious mistake, but he took immediate action to change that ______ it got worse. A．until B．when C．because D．before 【答案】D 【解析】 试题分析：句意：他犯一个严重的错误。但他采取行动来改变它以免变得更糟。A. Until直到；B. When当……时；C. Because因为；D. Before在……之前。在变得更糟之前采取行动改
状语从句教案
TheAdverbialClauses 抚宁一中王艳 I.Teachingtopic：TheAdverbialClauses II.Teachingtype：Grammar III.TeachingObjectives: 1Inknowledge： Enhancestudents’proficiencyandaccuracyinusingthe adverbialclauses. StepI ooseonekindoftheclausesandanswerquestionstogetpoints. 1.AdverbialClausesofTime(时间状语从句) 1）Askstudentstodomultiple-choicetoknowthedifferenceamong“when”,“while”and“as”. 2)Askstudentstothinkaboutotherconjunctionsandwritesentencesbythemselves.Thenaskst udentstocorrectmistakesbythemselvesandexplaintheimportantanddifficultpoints. 3)Askstudentstotranslatethreesentencestoknowdifferentmeaningsof“before” 2.AdverbialClausesofConcession(让步状语从句) 1）Askstudentstofillintheblanksaccordingtothepicture. 2)Askstudentstodomultiple-choicetoacquiretheimportantpoints. 3.AdverbialClausesofManner(方式状语从句)
初中英语语法状语从句大全
初中英语语法状语从句大全 1.时间状语从句 引导连词有when，while，till，not…until，since， after ,before ,as soon as The bus won’t start until everybody gets on. 公共汽车直到每人都上车为止，才开动。 When he knocked at the door I was cooking. 当他敲门时，我正在煮饭。 Last night before he came back home, his wife had already cooked dinner and waited for 2 hours. 昨天晚上在他回到家之前，他的妻子已经做好晚饭足足等了他两小时之久。 After I went to church, I went shopping. 2. 地点状语从句 地点状语从句通常由where, wherever 引导。 Where there is a will, there is a way. 哪里有志向，哪里就有出路。有志者事竟成。 Where there is a life, there is a hope. 哪里有生命，哪里就有希望。留得青山在，不怕没柴烧。 Wherever you go, whatever you do, I will be right here waiting for you. 不管你去哪里，不管你做什么，我都会在此守侯你。
3.原因状语从句 引导连词有because，as, since。 He didn′t see the film because he had seen it. 他没有看那部电影，因为他已经看过了。 They couldn’t get on the train，for it was too crowed. 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.
人教版九年级英语专题复习宾语从句定语从句教案
英语学科中考专项复习 宾语从句和定语从句教学设计 一：教学内容： 宾语从句的定义和结构、引导词、语序和时态 定语从句的关系代词 that, which, who ,whom,whose 二：学情分析： 九年级学生的英语水平参差不齐，成绩好的学生能够很好的掌握各个知识点，成绩中等的学生对于有些知识点可能是模糊不清，成绩不好的学生对英语可能完全是一窍不通。此次宾语从句和定语从句的专项复习，很多学生对两种从句认识不清，对他们应遵守的语法规则认识模糊，直接影响学生的理解句子的能力，尽管宾语从句和定语从句的考核只有两分，但它们涉及的面是广泛的。因此，我对这两种从句进行了详细的分析并通过历年各市的中考题来加深学生的印象。 三、教学目标 知识与技能：复习宾语从句的定义和结构、引导词、语序，掌握时态的变化以及定语从句的定义、结构和关系代词。 过程与方法：通过课堂活动，熟悉话题进行简单的交流，从历年中考题目中找出有关的信息，理解题意，并能简单归纳知识点。 情感态度价值观：通过课堂探究培养学生积极思考，踊跃发言的能力，增强他们解决问题的决心，提高学习英语的兴趣。 四、教学重点、难点： 重点：宾语从句的语序；定语从句的关系代词：that，which，who，whom，whose的使用。
难点：宾语从句中，主句与从句在时态上的相互呼应；定语从句中关系代词的使用 五、教具： PPT课件、资料 六、教学过程： Step1、进行中考考情考点分析 分析：岳阳中考题型 2016,2018年考的特殊疑问词引导的宾语从句，2017，2019年考的是定语从句.2019年湖南省有5个市考了定语从句，6个市考了宾语从句，而且都是由特殊疑问词引导的宾语从句。所考题型都以单项选择题为主。 Step2、板书一些宾语从句和定语从句，让学生分析它们的相同之处以及不同之处，然后老师进行总结。 I heard (that ) he got into a good high school last year. I like music that sounds good. This is the most interesting book (that) I have ever read. Could you tell me who he talked to just now? Tom prefers the singers who write their own songs. Do you know which city he has been to?
最新初中英语状语从句练习与答案
状语从句 一. 单项填空 1. _______ he’s old, he can still carry this heavy bag. A. Though B. Since C. For D. So 2. ---Do you know if he _______ to play basket ball with us? ---I think he will come if he ______ free tomorrow. A. comes; is B. comes; will be C. will come; is D. will come; will be 3. In the zoo if a child _____ into the water and can’t swim, the dolphins may come up ______ him. A. will fall; to help B. falls; to help C. will fall; help D. falls; helping 4. I don’t remember ________ he worked in that city when he was young. A. what B. which C. where D. who 5. We will stay at home if my aunt ________ to visit us tomorrow. A. comes B. come C. will come D. is coming 6. The police asked the children _______ cross the street ________ the traffic lights turned green. A. not; before B. don’t; when C. not to; until D. not; after 7. I was late for class yesterday _______ there was something wrong with my bike. A. when B. that C. until D. because 8. I’ll go swimming with you if I ________ free tomorrow. A. will be B. shall be C. am D. was 9. In the exam, the ________ you are, ______ the _______ mistakes you will make. A. careful; little B. more careful; fewest C. more careful; fewer D. more careful; less 10. Y ou should finish your lessons _______ you go out to play. A. before B. after C. when D. while 11. I hurried _____ I wouldn’t be late for class. A. since B. so that C. as if D. unless 12. When you read the book, you’d better make a mark _______ you hav e any questions. A. which B. that C. where D. though 13. The teacher raised his voice _______ all the students could hear him. A. for B. so that C. because D. in order 14. He took off his coat _______ he felt hot. A. because B. as C. if D. since 15. It is ______ that we’d like to go out for a walk. A. a lovely day B. too lovely a day C. so lovely a day D. such lovely a day 16. Mary had ______ much work to do that she stayed at her office all day. A. such B. so C. too D. very 17. _______ I felt very tired, I tried to finish the work. A. Although B. Because C. As D. As if 18. ______ the day went on, the weather got worse. A. With B. Since C. While D. As
宾语从句公开课教案
公开课教案 执教人：撒拉溪中学周礼秀 2014年 9 月 17日The teaching contents(教学内容)：Object Clauses(宾语从句) The teaching goals(教学目标)： 1.掌握宾语从句的慨念，构成和用法 . 2.掌握宾语从句的三类引导词 3.掌握宾语从句的时态变化 4.掌握宾语从句的语序 The teaching important points(教学重点) 1.宾语从句的慨念 2.宾语从句的引导词 3.宾语从句的语序 4.宾语从句的时态变化 The teaching difficult points(教学难点) 1.宾语从句的时态变化 2.if 和 wether 的区别 3.when 与 if 的用法 The teaching process(教学过程) Step 1.Lead-in 复习书上的内容导入新课（ P9）, ( 叫学生划分这些句子的成分 , 引出该堂课的教学内容——宾语从句 ) Step 2. Presentaion 一 .概念：置于动词、介词等词性后面起宾语作用的从句叫宾语从句。如：, He said he was good at drawing. (动词宾语) He began to think about what he should do.他开始考虑应当怎样做。( 介词宾语)。 （此外，除了谓语动词、介词能带宾语从句外，动词不定式，动名词形式后面也 能带宾语从句，还有些形容词（afraid,sure,glad等）之后也可以带宾语从句。）二 . 结构：主语 +谓语 +连接词 +宾语从句
三 . 种类：根据引词不同，宾语从句可分为三类。 1.由 that 引导的宾语从句。如果宾语从句是由陈述句充当，用 that 引导，that 无词义，在口语或非正式文体中常省略。如： The teacher said (that) he is a good student . The teacher said (that )the earth goes round the sun．。 The teacher said (that) light travels much faster than sound. ( 举此例是为下面讲时态作铺垫) 2.由 if 或 whether 引导的当宾语从句。如果宾语从句是由一般疑问句充当，就 用 if或whether引导，意为“是否” 。如： I don't know if／whether it will rain today。 在宾语从句中， if和 whether 通常可以互换，但在下列情况下只能用whether ：①在具有选择意义，尤其是直接与or not 连用时，往往用 whether （if,or not 也可以使用）。如： I don't know whether or not it will rain today 。(=I don't know if it will rain or not today。 ②在介词之后用 whether 。如： I ’m thingking about whether it will rain today. ③若用 if 会引起歧义时，则用 whether 。如： Please let me know if it will rain today.可理解为： a．Please let me know whether it will rain today.请告诉我今天会不会下雨。 b．If it will rain today.，please let me know．如果今天会下雨，请告诉我。 ④ whether 置于句首时，不能换用 if。如： Whether it will rain or not today，Ican't say．今天会不会下雨，我说不上来。 ⑤引导主语从句和表语从句时宜用whether 。如： Whether it will rain or not today is still a question．今天会不会下雨还是个问题。 The question is whether it will rain or not today．问题是今天会不会下雨。 ⑥在不定式前用 whether 。如： I haven’t decided whether to go to Beijing in National Day.(= I haven’t decided to whether/if I would go to Beijing in National Day.
初中英语——条件状语从句
初中英语―条件状语从句 一．条件状语从句的概念 条件状语从句，即在某种条件下，一件事情可能发生。在英语中由连接词if或unless 等引导的状语从句叫做条件状语从句。条件是指某一件事情实现之后（状语从句中），一件事情（主句）才能发生，通常译作“假如，只要，如果”等意思。条件状语从句中，主从句的时态要遵循“主将从现”的原则。即，主句是将来时态时，从句用一般现在时代替将来时态。 二.条件状语从句的引导词 1.If conj . 如果，假如 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。 2.unless conj.除非,若不,除非在……的时候（if ...not...） 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。 3.so/as long as conj.只要 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。 三．关于条件句的时态，常见的有以下三种情况： 1、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。 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。 2、如果主句是祈使句，那么从句通常要用一般现在时。 If you want to have a chat ,call me up. 如果你想聊天，打我电话。 3、如果主句是含有情态动词时，根据需要从句多用一般现在时。
初中英语语法状语从句专练及答案
初中英语语法状语从句专练及答案 1 ( ) 1 The meeting didn't start___ everyone was there. A. because B. until C. why D. if ( ) 2 The boy ___ to bed ___ his mother came in. A. went not; until B. didn't go; after C. went; until D. didn't go; until ( ) 3 I won't believe you___ I have seen it with my own eyes. A. before B. until C. after D. when ( ) 4 He ___ home ___ she was satisfied ___ his answer yesterday. A. didn't go; until; with B. wasn't go; after; to C. doesn't go; before; with D. didn't go; until; to ( ) 5 He ___ back until the work ___ done. A. isn't; will be B. isn't; is C. won't be; will be D. won't be; is ( ) 6 They didn't start the work ___ their teacher came back. A. until B. while C. as soon as D. if 2 ( ) 1 Tom will call me as soon as he ___ Shanghai. A. arrives B. will reach C. arrives in D. get to ( ) 2 I'm sure he'll come to see me before he ___ Beijing. A. will leave B. is leaving C. leave D. leaves ( ) 3 I will tell him the news as soon as he___ back. A. come B. comes C. will come D. came 3 ( ) 1 Tom has got a watch. He ___ it for two years. It _______ by his father. A. has bought; was bought B. has got; is bought , C. was bought; has bought . D. has had; was bought "' ( ) 2 When he got to the station, the train ___. A. left B. had left C. leaves D. has left ( ) 3 The boy told his father what he ___ in the street. A. saw B. have seen C. had seen D. see ( ) 4 We ___ TV when the telephone ____. A. watched; was ringing B. were watching; rang C. watch; rings D. are watching; rang ( ) 5 By the end of last term, I___ ten books. A. had finished reading B. have finish reading
初中英语语法宾语从句试讲教案
宾语从句教学设计 一、导入 1.复习什么是宾语。动词/介词后面的名词就是宾语。 I play basketball. We are talking about our homework.. 2.宾语从句就是在宾语的位置上放一个完整的句子。 3.I love that I can earn some coupons. $ 板书：He knows me. He knows what’s wrong with his wife. 说出2个句子的宾语。 说出2个句子的宾语是词（词组）还是句子。 第一个句子的宾语是一个词构成的，第二个句子的宾语是一个句子，我们称这种做宾语的句子叫宾语从句。在句子中充当宾语的从句叫宾语从句。其中he knows 叫主句，what’s wrong with him是从句。 说出下面4个句子的主句和从句。 A．He said that he had a very good journey home. ^ B．He asked if /whether they had come. C．He told me that the earth goes around the sun. D．He asked me how he could get to the nearest post office. 总结：。。是主句，剩下的是由that，if，how引导的宾语从句。 初步认识了宾语从句，下面我们开始了解宾语从句的三要素 引导词（连接词） 语序 [ 时态 1)从属连词that引导陈述句宾语从句，在口语或者非正式语中可以被省略 比如上面四句话中的A,C就是that引导的陈述句的宾语从句。如果省略掉that，该如何修改。（让学生口头修改） A．He said that he had a very good journey home. C．He told me that the earth goes around the sun. 2）由从属连词whether, if 引导一般疑问句的宾语从句，表示“是否”，比如上面的B就是由if引导的宾语从句， B．He asked if /whether they had come. 3）由连接代词who,whom,whose,which,what, whoever, whichever, whatever 和连接副词where, how, why,when引导的宾语从句
初中英语状语从句知识点总结
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 ｇeｔｔｈere．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 Englisｈweｌl unｌess you woｒk 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。