能用because-分句之前可用否定词或其他修饰语，这种分句之前还可以用某些并列连词，但for-分句不可以，同样的since- / as-分句也不可以。关于这一点，我们再补充例子： I went to the state university chiefly because the tuition was cheaper. She didn’t want to go to Africa, probably because the weather is too hot. I’m going there tomorrow because I have to, not because I want to.   由于since- / as-分句通常表示已知的原因，所以常常出现于句首，这语从句又是它们与for-分句用法上不同之处。 例如： As China is a long, narrow country, the temperature varies considerably from north to south. Since he had a certain talent for composition, his English master encouraged him to write little pieces for the college magazine. 当然since- / as-分句也可位于句尾，作为一种补充说明。 例如： I’ll have you ask someone else, since you can’t answer this question. He saw her, as they were both getting off the bus at the same time.   看完了小编整理的语法解析，大家对打败because、as和for这三个“小怪物”是不是多了几分信心呢？赶快收藏起来吧~

就是一种虚拟的条件或假设,从句多用一般过去时或过去完成时。如: 　　 If I were you, I would invite him to the party. 如果我是你,我会邀请他参加聚会。 　　 三、unless = if...not 除非，若不，除非在……的时候，例如： 1）Let's go out for a walk unless you are too tired.=If you are not too tired, let's go out for a walk. 如果你不累的话，我们可以出去走走。 2)Unless it rains, the game will be played. 除非下雨，比赛将照常进行。 四、典型例题：If he ___in half an hour,we ___wait for him. A. won't come ,won't 't come ,don't 't come ,won't come ,don't 解析：本题考查条件状语从句“主将从现”的运用。题干的意思是“如果他一小时后不来，我们将不会等他了”，从“in half an hour”，“一小时后”可知本句说的是未来的事，那么if引导的条件状语从句要用一般现在时表示将来时，主句要用一般将来时。答案：C 典型例题： ----I wonder if your wife to the party.----If your wife _________, so will mine。. A. will go， go B. will go, goes , will go D. will go, will go 解析：第一句中if表示“是否”，引导宾语从句，用将来时will go;第二句“如果你的妻子去，我的妻子也去”，if引导条件状语从句，用一般现在时表示将来时。 your wife，单三人称主语，所以用goes.答案：B

这样用法的引导词只能是that。本题下划线处引导了information的同位语从句(为避免头重脚轻， 本句中information的同位语从句与information之间被谓语动词部分隔开)。 11. Although he knew little about the work done in the field of physics, he succeeded ______other experienced experts failed. A. which B. that C. what D. where ［答案］ D 12. The other day, my brother drove his car down the street at ____ I thought was a dangerous speed. (2004上

想看。 It’s so interesting a film that we all want to see it. 这电影很有趣，我们都想看。 【注】在much, many, little, few 这四个词前总是用so而不用such： He had so many falls that he was black and blue all over. 他摔了许多跤，结果全身都是伤。 He earns so little money that he can hardly feed his family. 他赚的钱很少几乎不能养家糊口。   三、结果状语从句与不定式短语的转换 由so that和so…that引导的结果状语从句有时可与表结果的so as to和so…as to引出的不定式短语转换： He arrived late so that he missed the train. / He arrived late so as to miss the train. 他到得很迟，结果未赶上火车。 He wrote so carefully that he made no mistakes. / He wrote so carefully as to make no mistakes. 他写语从句是九大状语从句中较为简单的一种，也通常是我们最先接触到的一种，主要由so/such...that等词来引导。结果状语从句得很仔细，所以没有出错。 以上就是结果状语从句的大解析了，大家都get到了没有啊？好是那句老话，细节决定成败，大家一定要多多注意一些细节的小用法，做好辨析，千万不要因为小差错而白白丢分。

来了状语从句的基础知识讲解，快点学起来吧！ 1、时间状语从句： 常用引导词：when, as, while, as soon as, before, after, since , till, until 特殊引导词：the minute, the moment, the second, every time, the day，the instant, immediately , directly, no sooner … than, hardly …when, scarcely … when instantly 2、地点状语从句: 常用引导词：where 特殊引导词：wherever, anywhere, everywhere 3、原因状语从句: 常用引导词：because=in that, since=now that(既然), as, for(补充说明) 特殊引导词：seeing that, now that, in that, considering that, given that（考虑到） 4、目的状语从句： 常用引导词：so that, in order that 特殊引导词： for fear that（唯恐/生怕），in the hope that（带着..希望）, for the purpose that（带着..目的）, to the end that 5、结果状语从句： 常用引导词：so … that, such … that 特殊引导词：such that, to the degree that, to the extent that, to such a degree that 6、条件状语从句： 常用引导词：if, unless, 特殊引导词：as/so long as（只要）, only if, providing/provided that（倘若）, supposing that（倘若）, in case that（以防）, on condition that 7、让步状语从句： 常用引导词：though, although, even if, even though（即使） 特殊引导词： as(用在让步状语从句中必语从句指句子用作状语时，起副词作用的句子，可以修饰谓语、非谓语动词、定语、状语或整个句子。状语从句须要倒装)，while ( 一般用在句首 )，no matter …， in spite of the fact that, whatever, whoever, wherever, whenever, however, whichever, as if=as though（仿佛） 8、比较状语从句： 常用引导词：as(同级比较), than(不同程度的比较) 特殊引导词：the more … the more … ; just as …， so…; A is to B what /as X is to Y（A对B来说，像X对Y一样）; no … more than; not A so much as B 9、方式状语从句： 常用引导词：as, as if, how 特殊引导词：the way 以上就是状语从句相关的基础知识，不知道大家都掌握得怎么样呢？状语从句种类虽多，但只要能掌握好引导词，也就没什么困难了。

常可和以下关联词来引导as(或so)...as，than，according as，in proportion as等。 1、as...as... eg. I have never seen so much rain as fell that February. 我从未见过像那个二月那么多雨。(否定结构常用so…as, 也可用as...as) 2、than eg. The youth of today are better off than we used to be. 今天的年轻人比我们过去的境况要好。 3、according as eg. You will be praised or blamed according as your work is good or bad. 你受表扬还是责备得看你的工作好坏决定。 4、in proportion as eg. Men are happy in proportion as they are virtuous. 人之幸福与德行成正比。 5、The most…in/of eg. This book is the most interesting of the three.这语从句是在句子中充当副词成分的从句，比较状语从是状语从句中非常有特色的一种，主要用于表示比较，类比，比例等句本书是三本中最有趣的。 6、the + 形容词+est…of/in eg. This road is the busiest street in our city. 这条路是我们城市最繁忙的街道。 7、no more than只不过(嫌少的意思) eg. I have no more than 10 yuan.我只有十元。 8、not more than不如.....(前者不如后者) eg. She is not more beautiful than her mother.她没她妈妈好看。 9、one of the + 名词(复数) …之一(用于最高级) eg. She is one of the best students in our class. 她是我们班最好的学生之一。 以上就是小编为大家大家带来的比较状语从句知识点大总结了，不知道大家有没有掌握呢？希望大家能够吃透它们，熟练的在写作考试中应用起来，相信大家一定能得到不小的收获。

语从句是一种相对简单的从句

学好状语从句的关键就是熟练掌握各类引导词的用法，而状语从句往往数量多，每类从句又拥有大量的引导词，既不容易记忆，又容易混淆，所以这次沪江小编就先为大家整理了条件状语从句的各类引导词，大家记得认真看哦！ 条件状语常用的引导词是if和unless，但除了这两个以外，条件状语从句也拥有一些其他的引导词，这些引导词出现频率较低，用法偏复杂，所以不如if和unless知名度那么高。 1. on condition(that)...在……条件下 eg.I can tell you the truth on condition that you promise to keep a secret.

能来挽救他。 　　Buy whichever is cheapest. 买最便宜的。 　　注意以下受汉语意思影响而弄错的句子： 　　任何人来都欢迎。 　　误：Who comes will be welcome. / Anyone comes will be welcome. 　　正：Whoever comes will be welcome. / Anyone who comes will be welcome. 　　另外，它们也可引导让步状语从句，其意为“无论…”、“不管…”，其意相当于 no matter who [what, which]。如： 　　Whatever happens, you must be calm. 不管发生什么情况，你都必须镇静。(whatever = no matter what) 　　He won't eat you, whoever he is. 不管他是谁，他也不能把你吃掉。(whoever = no matter who) 　　注：whoever 既用作主格也用作宾语;作宾语时不宜用 whomever，因为在现代英语中 whomever 这个已几乎废弃不用。 4. why 与 because 的用法区别。两者均可引导表语从句，但前者强调结果，后者强调的原因。如： 　　I had a cold. That’s why I didn't come. 我感从句是一个十分重要的引导词，它可引导主语从句、宾语从句和表语从句，但不用于引导同位语从句冒了，因此我没来。 　　I didn’t come. That’s because I had a cold. 我没有来，那是因为我感冒了。