2、 知识讲解 知识点 【考查点1】 原因状语从句是用来说明引起主句这个结果的原因的从句，在初中阶段引导原因状语从句的从属连词主要的有because, as, since,for，seeing that, now that, considering that，in that等 The woolly shrank because it was washed badly. 毛衣因洗得不得法而缩水。
I can’t get to sleep because of the noise outside. 由于外面声音嘈杂我睡不着。
Since [As] we’ve no money, we can’t buy it. 由于我们没钱，我们无法购买它。
Seeing that it’s raining, we’d better stay indoors. 既然外边在下雨，我们最好待在室内。
Now that you are here, you’d better stay. 你既然来了，最好还是留下吧既来之，则安之。
【注】除以上提到的大家比较熟悉的引导原因状语从句的从属连词外，when有时也可引导原因状语从句when表示“既然” I won’t tell you when you won’t listen. 既然你不想听，我就不告诉你了。
原因状语从句应注意的问题 1、because , since , as , for,辨析 1）because语势最强，用来说明人所不知的原因，回答why提出的问题。当原因是显而易见的或已为人们所知，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引导的从句如果放在句末，且前面有逗 号，则可以用for来代替。但如果不是说明直接原因，而是多种情况加以推断，就只能用for。例 He is absent today, because / for he is ill. He must be ill, for he is absent today. 3） as和for的区别通常情况下，as引导的从句在主句前，for引导的从句在主句后。例 As the weather is cold, I stay at home.（同义句） I stay at home, for the weather is cold. 2、because习惯上不与so连用 汉语习惯上说“因为所以”，但英语习惯上却不能将 so与because 连用 正Because it was raining, we stayed at home. / It was raining, so we stayed at home. 误Because it was raining, so we stayed at home. 因为下雨，所以我们呆在家里。
3、because 从句与 because of短语的转换 Because引导的原因状语从句有时可与because of 短语转换，because of后加的原因可以为好或坏 ，但最正规的还是because。
He can’t come because he is ill. / He can’t come because of his illness. 他因病不能来。
I said nothing about it because his wife was there. / I said nothing about it because of his wife’s being there. 因为他妻子在那儿，我对此事只字未提。
常见考法 对于原因状语从句的考查，多以单选和完形填空的形式，从连词的意义角度让大家选择连词。
典型例题He found it increasingly difficult to read, ____ his eyesight was beginning to fail. A. and B. for C. but D. or 解析 “his eyesight was beginning to fail”是“he found it increasingly difficult to read”的原因， 因此本题应选用可以表示原因的连词for引导原因状语从句。
答案 B 误区提醒 除了because , since , as , for这四个词的辨析外，对于because 从句与 because of短语的区分也是难点之一。Because引导的原因状语从句有时可与because of 短语转换，because of后跟的是短语 ，because后跟的是句子。
典型例题He didnt go to work the heavy rain. A .because B.because of C.so D.since 解析题干的意思是“ 由于那场大雨，他没有去上班”，the heavy rain.表示原因，排除C；
since和because 表示原因，后面跟的是从句，也就是说必须是一个完整的句子，本题中the heavy rain没有主语和谓语，.只是一个短语，所以排除A和C；
because of表示“由于”，后跟名词、代词或短语。
答案B 【考查点2】 目的状语从句用来说明主句中谓语动词发生的目的的从句叫做目的状语从句。
表示目的状语的从句可以由 that以便，so that以便， in order that为了;以便，Lest免得;唯恐， for fear that生怕;以免等词引导;目的状语从句的谓语常含有may, might, can, could, should, would等情态动词。
例如You must speak louder so that /in order that you can be heard by all. He wrote the name down for fear thatlest he should forget it. Better take more clothes in case the weather is cold. 学习目的状语从句应注意以下两点 1目的状语从句中常含有can,could,may,might,should等情态动词。例如 I got up early so that I could catch the first bus. 我起得很早，目的是为了赶上头班公共汽车。
2在口语中so可以引导目的状语从句。例如 Well sit nearer the front so we can hear better. 我们坐的靠前一点，因此，我们听得清楚一点。
1、in order that与in order to的区别 in order that从句 in order to动词原形 in order to后面加的那个不叫目的状语从句，叫目的状语 例如 He got up early in order to take the first bus. He got up early in order that he could take the first bus.他起床很早是为了赶上第一班公共汽车 目的状语从句的一个特点由于目的都是未来的行为，所以从句中一般用表示未来可能性时态，比如上面句中的could。当然还可以用will,would,can,等 。
2、so that既可引导目的状语从句，也可以引导结果状语从句。
1其引导结果状语从句时，so that翻译为“以至于...”，经常可以和so/such...that...转换，且从句只能放在主句之后。如He got up late so that he was late for school. He got up so late that he was late for school. 2其引导目的状语从句时，从句只能放在主句之后，此时可以和in order that换用。如He got up early so that he could take the first bus. He got up early in order that he could take the first bus. 常见考法 对于目的状语从句的考查，多以单选和完形填空的形式，从连词的意义角度让大家选择连词。
典型例题Ann listened carefully _____ she could discover what she needed. A. such that B. in order that C. because D. even though 解析题干的意思是“为了能够发现自己需要的东西，安认真听讲”。很明显从句表示的是目的。such that本身是错误短语，because 表示原因，even though是“尽管”的意思，不符合题意。
答案B 误区提醒 如何区别目的状语从句中的so that与结果状语从句中的so that的用法，这是我们需要注意的。目的状语从句的so that是连着的，结果状语从句是分开的，即sothat. so that是目的状语从句，是为了什么什么，有目的的含义。而sothat是结果状语从句，是“如此怎么怎么样结果是什么”。仔细体会一下吧 典型例题I get up so early I can not be late A. that B . so that C.such that D.in order 解析题干的意思是“我起床如此早以便于我可以不迟到”。从句表示目的，首先排除C，因为such that本身是错误短语，在排除in order，因为它后面不能跟句子;因为句子中有so,所以大家可能选A，如果选它，那句子的意思是“我起床如此早结果我可以不迟到”，显然说不通，所以排除。
答案 B 三、例题精析 【例题1】 【题干】 ____ you’ve got a chance, you might as well make full use of it. A. Now that B. After C. Altho