初中英语状语从句知识点总结（一）用来润饰主句中的动词，形容词或副词等而充任状语的从句叫做状语从句。
状语从句常用隶属连词来引导，与主句连接起来。
若置于句末，则前面不加逗号。
依据含义和效果，状语从句可分为时刻原因条件等几种。
下面咱们就来剖析一下这几种状语从句。
1 时刻状语从句时刻状语从句常用隶属连词 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神态动词时，其时刻状语从句中的谓语动词常用一般现在时态表明将来产生的动作或存在的状况。
这便是咱们常说的“主将从现”。
如：Please call me when you get there. 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 引导时刻状语从句表明“自从 , 以来”，从句中的动词一般表明动作的起点，用曩昔时 ; 而主句的动作连续的状况则用一般现在时或现在完结时。
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. 自从咱们前次碰头，现已三年了。
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. 假如明日下雨，我就待在家。
You can’t learn English well unless you wo rk hard.除非你努力学习，否则是学欠好英语的。
<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现实相反的事实，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)。
此刻，主句则用曩昔将来时。
如：If I had enough money,I would buy it for you. 假如我又满足的钱，我将把它买给你。
I wouldn ’t do it if I were you. 假如我是你，我是不会做的。
3 原因状语从句because,since,as,for 都可用来引导原因状语从句，那么它们又有哪些区别呢?①because 用来表明“形成某种成果的直接原因”，口气较浓，常用来答复why提出的问句。
如：---Why are you late?---Because my bike is broken.②as 和 since 用来表明“看的到的或是不说也知道的原因”， since 也可译作：“已然”。
如：As he is old enough,let him do it. 他已然长大了，就让他干吧 !Since his sho es are worn out,let ’s buy him a new pair.已然他的鞋坏了，那咱们就给他买双新的吧。
③for 引导的原因状语从句不置于句首，常用来表明“趁便提及的理由”，仅仅稍带阐明原因，并非着重。
如：I must stay here,for it ’s raining so hard. 我有必要得待在这儿，由于雨下的很大。
初中英语状语从句知识点总结（二）1 状语从句在复合句中，润饰主句中的动词、形容词或副词等的从句叫状语从句。
状语从句依据它表达的意思可分为时刻、地址、原因、意图、成果、退让、比较（或方法）和条件等类。
1. 时刻状语从句引导连词有when，while ，till ，not,until ，since ，after ,before ,assoon asThe bus won’t start until everybody gets on.公共汽车直到每人都上车停止，才开动。
When he knocked at the door I was cooking.当他敲门时，我正在烧饭。
Last night before he cameback home, his wife had already cooked dinnerand waited for 2 hours.昨天晚上在他回到家之前，他的妻子现已做好晚饭足足等了他两小时之久。
After I went to church, I went shopping.2. 地址状语从句地址状语从句一般由 where, wherever 引导。
Where there is a will, there is a way. 哪里有志趣，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，哪里就有期望。
留得青山在，不怕没柴烧。
Wherever you go, whatever you do, I will be right here waiting foryou.不论你去哪里，不论你做什么，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，由于他现已看过了。
They couldn ’t get on the train ，for it was too crowed.比较：because, since, as 和for1） because 语势最强，用来阐明人所不知的原因，答复 why提出的问题。
当原因是清楚明了的或已为人们所知，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 引导的从句假如放在句末，且前面有逗号，则能够用 for来替代。
但假如不是阐明直接原因，而是多种状况加以揣度，就只能用 for 。
He is absent today, because / for he is ill.He must be ill, for he is absent today.留意because 不能和so 连用。
4. 意图状语从句引导连词有that ，so that, ，in order that 。
He must get up early so that he can catch the first bus.他有必要早上，以便能赶上第一辆公共汽车。
He repainted the house so that he could welcome the guests.Millions of trees are planted in North China so that the sand can bestopped from moving south.The mother left work earlier in order that she could be at home whenthe children arrived.So that , ——以便 / 致使,,例如：(1)They studied hard so that they could pass the exam.(2)They started early so that they caught the early bus.留意点：在例句(1) 中, 是引导目的状语；在例句(2) 中，是引导结果状语。
一般来讲，从句中含有神态动词的，为意图状语。
无神态动词的，为成果状语。
5. 成果状语从句引导连词有that ，so,that, ，such,.thatThe box is so heavy that I can ’t lift it.这个盒子如此沉，致使我无法抬起来。
such+名词性词组+that,So+形容词/ 副词+that, ——如此,, 以致,,例如：(1)She is such a good teacher that we all love her.(2)It was such a hot day that they didn ’t go out for a walk as usual.留意点：1.such+a+形容词+名词+that, ，可以改写成：so+形容词+a+名词+that, ，例句(1) 可以改写成：She is so good a teacher that we all love her.2. 在such+形容词+名词复数或不可数名词+that , 结构中，形容词如果是many/few 或much/little 时，用so 不用such，即：so+many/few+可数名词复数+that, ，so+much/little+ 不可数名词+that,(1)There are so many people in the room that I can ’t get in.(2)The man has so much money that he can buy a car.6. 退让状语从句引导连词有though，although; even though/if; whatever; howeverAlthough he is young ，he knows a lot of things.尽管他年纪小，但却知道许多事物。
Even though you don ’t like him, you still have to be polite.Whatever you say, I will not change my mind.留意although ，though 不能和but 连用。
7. 比较（方法）状语从句以 than 为引导连词。
常见连词（as）,as.., ,than,; the,, the,Jim is older than Lucy （is ）.吉姆比路希年长。
Skiing is more exciting than running.The more you practice, the more knowledge you will get.留意than 引导的比较状语从句中的谓语常省掉。
8. 条件状语从句以if, unless 为引导连词。
If you eat bad food ，you may be ill.假如你吃到坏了的食物，就会患病。