英语原因状语从句，原因状语从句和地点状语从句，because， since， a...

知识点1:英语原因状语从句

[答案] B
[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。
[考题3] A man cannot smile like a child, ____ a child smiles with his eyes, while a man smiles with his lips alone. (2006湖南)
A. so B. but C. and D. for
[答案] D
[解析] 下划线处之后的句子补充说明“a man cannot smile like a child”的原因， 应选用for表原因。
下一篇：英语虚拟语气的用法讲解[1]虚拟语气,用法,相关知识点

一些“should ＋ 动词原形”虚拟语气的用法2．在名词suggestion, order, proposal, plan, desire, request, decision, idea, advice等之后接表语从句或同位语从句时，也应该用“should ＋ 动词原形”。如：1)The decision that we should build another new s查看详情>>

知识点2:原因状语从句和地点状语从句

原因状语从句多由because，as，since，seeing(that)，considering that等连词引起：
You only do it because you have to．[2]have to,have,相关知识点

have go还是have to gohave go还是have to go请看下面的题，是选have go还是have to go?Whom would you rather _________ with you, Jim or Jack?A. have go B. have to go C. have gone D. has to go有的同学从一看选项便首先排除了A，认为查看详情>>

你这样做只是因为不得不如此。
As he had been up since 4 a.m.，he was very tired．[3]since,been,相关知识点

It's/has been +一段时间+since从句 自从某时起做某件事情已经一段时间了。　　该句型中since引导的时间状语从句常用一般过去时。例如：　　It's twenty years since he came here. 他来这里已经20年了。　　It has been six years since he married Mary. 他和玛丽结婚已经六年了。考试用查看详情>>

由于他清晨四点就起床了，他十分疲倦。
He can't come with us since he's ill.[4]since单词记忆法

◆记忆方法一：联想方式：sin四年；ce车自从来广州，他就开了四年车◆记忆方法二：联想方式：sin四年；ce车记忆方法：自从来广州，他就开了四年车查看详情>>

由于生病他不能和我们一道去。
Stay in bed longer today，seeing that you were late last night.
昨夜你睡得晚，你今天多睡一会儿。
Considering he's only been learning English a year he speaks it very well.
考虑他学英语才一年，他英语是讲得很好的。
Now that you have the chance you had better avail yourself of it.[5]had better,better,相关知识点

英语情态动词之had better与'd better[1]better单词记忆法◆记忆方法一：联想方式：be—是tt—兔兔er—耳记忆方式：兔兔的耳朵是更好的◆记忆方法二：联想方式：be—是tt—兔兔er—耳记忆方法：记忆方式：兔兔的耳朵是更好的查看详情>>had better 意为“最好”，'d better 为其缩写形式，其后续跟动词原形。注意：h查看详情>>

既然你现在有了机会，你最好加以利用。
下面这类句子中的从句也表示原因：
I'm glad that you are all safe．
我很高兴你们都安然无恙。
I'm proud that you had the thought．
你有这个想法我感到骄傲。


知识点3:because, since, as和for 引导的原因状语从句

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.[6]because单词记忆法

◆记忆方法一：联想方式：be（是）＋ca（茶）＋use（使用）记忆方法：因为是茶的使用不当，所以才引起了腹泻。查看详情>>

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。
He is absent today, because / for he is ill.
He must be ill, for he is absent today.

知识点4:引导原因状语从句和方式状语从句的连词

You must do as your parents tell you. 你必须按你父母说的去做。
They treated the child as if she were their own. 他们待这孩子像亲生的一样。
The didn’t do it the way we do now. 那时他们不像我们现在这样行事。
The steak is cooked just how I like it. 牛排正像我喜欢的那样做了。



知识点5:英语原因状语从句用法归纳[7]用法,从句,相关知识点

imagine后接动词和从句的用法imagine后接动词和从句的用法1. 表示“想象”，其后可接动名词（可以有逻辑主语），但不能接不定式。如：Try to imagine being on the moon. 设法想象你是在月球上。I can’t imagine my mother approving. 我不能想象我母亲也赞成。注意，imagine 后不接不定式或不定式的复合结查看详情>>