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1、 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 m
2、inute，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 fe
3、ar 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
4、.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
5、 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 wa
6、s +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
7、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
8、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=immediatel
9、y,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 g
10、o 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.
11、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。
12、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 stu
13、dy 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
14、 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
