状语从句一状语从句定义 状语从句是一个相当于副词的从句，在句中起副词的作用，充当状语。状语从句主要分为时间，地点，原因，方式，条件，让步，比较，目的和结果状语从句。温馨提示：一般情况下，状语从句从句的引导词在状语从句中不充当成分，根据上下文的逻辑关系来选引导词，所以要重点掌握状语从句的引导词的含义。 二.状语从句的引导词 状语从句中的常用连词和特殊连词 从句类型常用连接词特殊连接词时间状语从句when，while，as，before，after，since，till，until，as soon as,by the time一些时间名词：the moment，the instant，the minute，the day，next time，every time，the first time，the last time一些副词：instantly，immediately，directly固定搭配的连词：no sooner.than，hardly/scarcely.when地点状语从句where wherever，anywhere原因状语从句because，since，as，forconsidering that，given that，in that，now that，for the reason that目的状语从句(so) that，in order thatlest，for fear that，in case结果状语从句so/such.that，so thatto the/such a degree that，to the/such an extent that条件状语从句if，unless，as long assuppose，supposing，providing，provided，on condition that让步状语从句although，though，even though，even ifwhile(一般用于句首)，as(用于倒装结构)，wheverno matter wh，whether.or.比较状语从句as，thanthe more.，the more.方式状语从句as，as if/thoughthe (same) way，A is to B what C is to D1. 时间状语从句状语从句中从属连词when，while，as的多种含义 when：当时候；就在那时；既然；虽然；在之后；as：一边一边；随着；虽然；因为；依照，如；while：在期间；而；虽然。用when，while和as填空：He will take my place _ I am away.I was having my lunch _ the fire alarm went off._ you have finished your work，you may have a rest._ he swam，he cried for help._ the Internet is of great help，I dont think it good to spend too much time on it.【答案】whilewhenWhenAsWhilebefore的用法 注意判断before在状语从句中的含义：才；就；趁没有；还没来得及；宁可也不；不知不觉。【解析】before 常用于以下句型： It will (not ) be +时间段+ before.表示“要过多久/ 不久才” It was not long + before 表示“不久就.” It was +时间段+ before 表示“过了多久才”1. 判断下列各句中before的含义：()We had sailed four days and four nights before we saw land. ()We hadnt run a mile before he felt tired. ()Please write it down before you forget it.()Before I could get in a word，he had measured me.()She would die before shed give in.()Three months went by before we knew it. 2. 区别以下句型：用before，that，since，when填空：Its three days _ he returned home.It was three days_ he returned home.It will be three days_ he returns home.It was three days later _ he returned home.It was three oclock _ he returned.【答案】1. 才就趁没有 还没来得及宁可也不不知不觉2. sincebeforebeforethatwhen注解答此类题目关键有三点：首先要确定是不是强调句，当我们把it is/was以及连接词去掉时，剩余部分若能构成一个完整的句子，就是强调句，这时连词用that；否则，就要考虑它的句式特点。其次要看是时间段还是时间点。再次是连接词前后的时态。当确定为时间段时，连接词前后时态不一致，用since；时态一致，用before；当确定为时间点时，强调句就用that，否则就用when。 The moment he saw me ,he recognized me. 他一看见我，就认出我了（the moment,the minute, the instant 名词连词化=as soon as=immediately,directly 副词连词化） .till/until 表示到.时间为止主句的动作结束。Not.until.表示到.时间为止主句的动作才开始。until可用于句首，而till通常不用于句首。 Eg. He waited.( until I came here等的动作在我来的时候结束） 他等到我来这儿。 He didnt go there until he finished his homework.(去那里到他完成作业时才发生）直到他完成作业才去那儿。 She _ (sleep) until midnight. She _ (arrive)until midnight.He didnt go to bed until he finished his work. _(倒装句)_(强调句)【答案】slept；didnt arriveNot until he finished his work did he go to bed；It was not until he finished his work that he went to bed 2.地点状语从句:where ,wherever Where there is a will,there is a way.有志者事竟成。 I want to go wherever climate is mild. 我想去气候温和的地方。 3.原因状语从句：because, since, as, in that, now that（= since） Because he was ill, he didnt go to school.（直接原因）因为他病了，他没去上学。 Since/Now that we are all here, lets begin our meeting.（大家都知道的原因，since既然） 既然大家都到齐了，我们开始开会吧。 As he did not know much English , he looked up the word in the dictionary . 由于他不懂什么英语，所以查字典。 He is a good student in that he studies hard.(in that在于） 温馨提示:because, since, as, in that, now that（= since）的区别 because 表示直接原因，用于下面几种情况 1）用why 提问，回答时必须用because -Why was he late? -Because he was caught in the traffic jam. 2)只有because 能用于强调句中 ,不能用since, as, in that, now that It is because he didnt study hard that he failed in the exam. 3）当前面有副词时，如partly/mainly/totally等，只能用because The air pollution is very serious mainly because vehicles let out carbon dioxide. 空气污染很严重主要因为车辆排放二氧化碳。 since=now that “既然”，不是直接原因，是大家都知道的原因。 as “由于”，在口语中可代替because. for 是并列连词，放在句末，用逗号和前面的句子隔开，表示解释说明。 It must have rained last night, for the ground is wet now.（两个并列句） 昨天晚上一定下雨了，因为地湿了。 4. 让步状语从句: although, though, even if, even though, as, whatever(=mo matter what), however(=no matter how), whoever(=no matter who), whomever(=no matter whom), whenever(= no matter when), wherever(=no matter where), whichever(=no matter which), whether.or. （无论是.还是） Although/though/Even if /Even though it is raining h