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.
状语从句的讲解 就是用一句话作状语分为：时间，地点，方式，原因，结果，条件，让步，目的，比较 一、时间状语从句 第一次见到你 一见到你我就喜欢上了你 直到见到你 五岁时见到你 When, as, while, before, after, since, till/until, as soon as no sooner…than…scarcely…when…hardly…when…the minute the second the instant the moment by the time 截止immediately instantly directly each time every time next time the first time on doing sth when while 当…时 as 1. when 1）当…时/ 延续性动词短暂性动词都可用 2）这时/ 3）届时、到时 I was watching TV when my cellphone suddenly rang这时 When I was five years old I could speak five languages The wet weather will continue tommorow when a cold front is expected to arrive届时到时 注意：时间状语从句中动作发生有前后时先发生的用过去完成时 When my mother came back I had already gone to bed. 2. while 1）从句动词延续性 2）同时发生 3）对比的意味“然而” 4）趁着 He taught himself while he worked in a bank 延续性动词当他在银行上班时 While we were working they were having a rest.对比 While they were having a discussion , they got very confused.同时 I want the girls to experience that while they are young趁着她们还年轻我想让姑娘们体验一下 对比：I prefer black tea, while he likes coffee 3.As 1)当…时 2）一边...一边 3)随着 As the children walked along the street, they sang happily.当孩子们 He sang as he danced一边一边 You will grow wiser as you grow older随着 4.before 1）在…前 2）前加一段时间直到…才… 3)还没来得及 4)要过…时间才 I’ll be back before you leave It may be many years before we meet again 可能要过很多年我们才能见面 The students rushed outside before I could finished my word 还没等我讲完 It will be three weeks before he finished his work It won’t be long before he finished his work. 用不了多久 5.after After my friend got married, she went to live in America 6.since 自从主句一般为现在完成时 We’ve never met since we graduated from the college Great changes have taken place since you left 7.till/untill肯定句中可互换直到…为止 否定句中只用not…until…直到…才 Not until 放句首句子部分倒装（倒装主句） Donald will remain in college until/till he finished his PhD course
(1)原因状语从句通常由because, since, as,for引导。 (2)because表示直接原因，语气最强。because引导的原因状语从句多放在主句之后。回答由why提出的问题，只能用because。此外，because和so不能同用在一个句子里。 例如：------Why aren’t going there?------Because I don’t want to. since引导原因状语从句，相当于now that，意思是“因为……，既然……，鉴于……”。 例如：Since the rain has stopped，let’s go for a walk. 既然雨停了，我们出去散散步吧。 as和since语气较弱，一般用来表示明显的原因。由as和since引导的原因状语从居多放在句首。 例如：As he has no car, he can’t get there easily. Since we have no money, we can’t buy it. (4)for表示所说的理由是一种补充说明,for引导的从句一般不放在句子的开头。如: I decided to stop and have lunch, for I was feeling quite hungry. 小试牛刀：I was late for class yesterday _______ there was something wrong with my bike. He took off his coat _______ he felt hot. you can’t answer the question, I’ll ask som eone else. ●结果状语从句 (1)结果状语从句由so…that, such…that, so that引导。 (2)so…that语such...that可以互换。在由so...that引导的结果状语从句中，so是副词，与形容词连用。其结构是: “...so + 形容词（副词）+ that + 从句”。 例如：He was so glad that he couldn’t say a word. Mother lives so far away that we hardly ever（几乎不，从来不）see her. 在由such…that引导的结果状语从句中，such是形容词，它修饰的可以是单数或复数可数名词，也可以是不可数名词；其结构是: “...such +a / an + 形容词+名词+ that + 从句”。 例如：It was such a hot day that nobody wanted to do anything. He had such long arms that he could almost touch the ceiling.（天花板） 有时上述两种结构是可以互换的。 例如：It was such a wonderful film that all of us wanted to see it again. =The film was so wonderful that all of us wanted to see it again. (3)如果名词前由many, much, little, few等词修饰时，只能用so, 不用such。 例如：Soon there were so many deer that they ate up all the wild roses. He has so little time that he can’t go to the cinema with you. （4）如果主从句的主语相同，并且从句是否定的形式，可以用too...to...句型转化。 例如：He was so excited that he couldn't go to sleep that night. = He was too excited to go to sleep. （5）如果主从句的主语相同，但从句是肯定的形式，可以用adj.+ enough替换。 例如：He is so old that he could go to school. = He is old enough to go to school.他够大了，可以去上学。 小试牛刀：It is ___ hot in the room ___ we have to go out for a walk. It was a wonderful movie all of us wanted to see it again.
A、引导原因状语从句的连词 原因状语从句一般由从属连词because, as, since，now that引导。 B、because, as, since和now that的区别： 1、because“因为”，表示直接的原因，语气最强。 1）why提问的句子，必须用because回答。 2）because的从句常放在主句之后。 3）because 不能与so连用。 4）because+ 从句；because of+ 名词短语 I missed the train because I got up late. He was angry not because we were late but because we made a noise. -Why didn’t he come yesterday? -Because he was ill. 2、as“因为”，语气较弱，一般放在主句前，中间用逗号隔开，表示的是明显的原因。 As he was not well, I decided to go there without him. As it was raining hard, we had to be indoors. 3、since/ now that“既然”，一般放在主句前，中间用逗号隔开，表示的是明显的原因或众所周知的事实。 Since/ Now that this method doesn’t work, let]s try another. Since/ Now that you feel ill, you'd better not go to work. C、for 引导的并列句与原因状语从句的辨析 并列连词for“因为”，引导的不是从句，而是并列分句，只能放在主句之后，不能放在句首，常用逗号把它和前面的分句隔开。对主句补充说明理由或推断原因。 It rained last night, for the ground is wet. She must have gone out early, for she had not come for breakfast. Exercise: 一、填入恰当的连词 1. I didn’t go to school yesterday _________ I was ill. 2. ________ everybody is here, let’s begin our meeting. 3. ________ you are in poor health, you should not stay up late. 4. I asked her to stay to tea, ________ I had something to tell her. 5. ________ all the passengers are here, why don’t we start at once? 6. Bill won’t make any progress ________ he doesn’t study harder than before. 7. He might have gone to bed, ________ the light went out. 二、改写句子,保持句意不变 1) The ship changed its course because there was a storm. The ship changed its course _______ _______ _______ _______. 2) Because he was ill, he didn’t go to school. He was ill, _______ he didn’t go to school. 3) He couldn't walk because his leg was broken. He couldn't walk ______ ______ his ______ leg. 4) I came back because it was raining heavily. I came back ______ ______ the ______ rain.
1、定义：在句中用来说明主句原因的句子叫原因状语从句。 2、常用引导词: because(因为), as (由于), since (既然), now (that) (既然) 3、时态：原因状语从句一般都是根据实际情况选用适当的时态。通常是主过从 过，主现从现。 4、because, since和as的区别： 1) because引导的原因状语从句一般放于主句的后面，because从句位于句首时要用逗号分开，放在句末时，可不用逗号分开。because表示直接原因，语气最强，最适合回答why引导的疑问句。because of 也表示原因，但它后面不接从句, 只能接名词, 代词或动名词。注意：because 和so 不可同时出现在一个句子里。 ①I do it because I like it. = I like it so I do it. ②We went by bus because it was cheaper. = It was cheaper so we went by bus. ③He can’t go to school because of his illness. 2) since引导的原因状语从句一般放于主句之前表示已知的、显然的理由(通常被翻 译成“既然”= now that )，较为正式，语气比because弱。 ①Since you are free today, you had better help me with my mathematics. ②Since you don't trust him, you should not employ him. ③Now (that) you are grown up, you should not rely on your parents. 3) as引导原因状语从句时表示附带说明的“双方已知的原因”，含有对比说明的意味， 语气比since弱，较为正式，位置较为灵活(常放于主句之前)。 ①As it is raining, you’d better take a taxi. ②As you are tired, you had better rest. ③I went to bed early, as I was exhausted. 4) for引导的是并列句表示原因但并不说明主句行为发生的直接原因，只提供一些辅 助性的补充说明，for引导的并列句只能放于主句之后并且必须用逗号将其与主句隔开。 ①He could not have seen me, for I was not there. ②He seldom goes out now, for he is very old. 5.
