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1、状语从句一状语的存在是为结构已经完整的句子添补信息，用来说明动发生的时间、地点、方式等，一般用单词或短语作状语。例子：I go to school.(主谓宾都有，结构完整)I go to school every day.(增添了表明时间的状语)I go to school by bus.(增添了表明方式的状语。)二从句：处于从属地位的句子三状语从句的本质：当给出的状语信息越来越丰富，无法仅用一个单词或逗语来表达时，就可以用一个句子来充当状语成分例子：I went to school.(我去上学。)I went to school when I was four years old.(状语从句
2、)(我四岁的时候就去上学了。)状语从句的两类结构：(1)引导词十从句，主句Because this book is interesting,I like it.(1)主句十引导词十从句I like this book because its interesting四状语从句的分类（一）时间状语从句引导词：when(在时),while(在期间),as(随着),before(在之前),after(在之后),since(自从),till/until(直到),notuntil(直到才),as soon as(一就)等。When Igot off the bus,I fell down.(当我下车时，我
3、捽倒了。)(时间点)I was doing my homework while my mum was cooking.(当我妈妈在做饭时，我在写作业。)(时间段-表两个动作同时进行)Things will get easier as time goes by.(两个动作同时发生。)(随着时间的流逝，情况会有所改善。)till/until与notuntil区别till/until表延续性动作的结束，跟其连用的一般为延续性动词。not.until表非延续性动作的发生，跟其连用的一般为非延续性动词。举例子：I will stay here until/till the rain stops.(我要在
4、这儿呆到雨停。)I wont leave until the rain stops.(直到雨停我才会离开。)since当主句用现在完成时的时候；从句用一般过去时句式结构：主语+have/has done+since十一般过去时lt is+时间段十since十一般过去时举例子：I have memorized 3000 words since I went to school(自从我上学以来我已经背诵了3000个单词了)It is ten years since I became a doctor.(我成为一名医生已经有十年了。)主将从现时间状语从句要遵循主将从现原则(当主句是一般将来时，从句要
5、用一般现在时。)举例子：I will call you as soon as I get home.(我一到家就给你打电话。)I will visit my grandparents after I finish my homework.(我作业完成后就会去拜访爷爷奶奶。)(二)地点状语从句举例子：Where there is a will,there is a way.(有志者.事竟成)He goes wherever he wants.(他去他想去的任何地方。)(三)原因状语从句引导词：because因为“,强调原因，最常用，可回答“why”的提问。as/since由于,既然,强调结果，常
6、放在句首。Ior”因为“,补充说明原因(解释上文),不可放句首，前有逗号。举筑子He is absent because he is ill.(强调原因)(因为他生病了，所以没来。)Since everyone is here,lets begin our meeting.(强调结果)(既然大家都到了，我们开始会议吧。)As it is raining today,we cant go for a picnic.(强调结果)(由于今天下雨，我们不能去野餐了。)It must have rained last night,for the ground is wet.(解释上文)(昨晚肯定下雨了，
7、因为地板是湿的。)(四)目的状语从句举例子I got up early so that I could catch the first bus.=I got up early in order that I could catch the first bus.(我早起为了赶上第一班公交车需。)（五）结果状语从句）同义替换He is so young that he cant go to school.=He is too young to go to school.(tooto太而不能)=He is not old enough to go to school.(notenough to不够做
8、某事)（六)条件状语从句if(如果) unless(除非) as long as(只要)时态原则：主将从现主句为一般将来时，从句用一般现在时主情从现主句有情态动词时，从句用一般现在时主祈从现主句为祈使句时，从句用一般现在时举例子：If it doesnt rain tomorrow,we will go for a picnic.(如果明天不下雨，我们要去野餐。)(主将从现)You cant pass the exam unless you study hard.(除非你努力学习，否则你不能通过考试。)(主情从现)Please call me as long as you finish you
9、r homewek.(只要你完成作业光请给我打电话。)(主祈从现)(七）让步状语从句引导词：though/although(虽然，尽管); even though/if(即使)however(然而);疑问词+ever=no matter+疑问词(无论)举例子：I wont mind even if he doesnt come here.(即使他没有过来我也不介意。)Though they are poor,they are very happy.(虽然他们很穷，但是他们过得很快乐。)No matter who you are,you must obey the rules.(无论你是谁，都必
10、须遵守规则。)（八）比较状语从句引导词：than (比),.the+比较级，the+比较级(越就越)as.as(和一样；not as/so.as(不如)举例子：The more you read,the more you understand.(你书看得越多，就懂得越多。)The job is not as easy as I thought.(这份工作没有我想的那么简单。)Sam can run as fast as I can.(萨姆跑得和我一样快。)I make more money today than I did yesterday.(我今天赚的钱比昨天赚的多。)学科网（北京）股份有限公司
