原因状语从句(怎样判断原因状语从句)

一、引导原因状语从句的从属连词

主要的有because,for,in that,for the reason that;as,seeing (that), seeing as;since;no (that); considering (that)等：

The oolly shrank because it as ashed badly.

毛衣因为洗涤的方法不好而缩水。

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) e’ve no money, e can’t buy it.

由于我们没钱，我们不能购买它。

Seeing that it’s raining, e’d better stay indoors.

既然外边在下雨，我们最好待在室内。

No 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，hen有时也可引导原因状语从句(hen表示“既然”)

I on’t tell you hen you on’t listen.

既然你不想听，那我就不告诉你了。

二、关于not…because结构

该结构中的否定词有时否定主句，有时否定从句，一般要根据句子的意思作出正确或合乎逻辑的理解。若not否定主句，最好在because之前用逗号，否则会引起歧义，如下句在没有特定上下文时就有两种解释：

I didn’t go because I as afraid.

我没有去是因为怕。/ 我不是因为怕才去的。

不过若because之前有just修饰，一般认为not 是否定从句的：

You shouldn’t get angry just because some people speak ill of you.

你不要因为有人说你坏话而生气。

三、because不能与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：

因为下雨，所以我们得呆在家里。

正：Because it as raining, e stayed at home. / It as raining, so e stayed at home.

误：Because it as raining, so e stayed at home.

四、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 e because he is ill. / He can’t e because of his illness.

他因病不能来。

I said nothing about it because his ife as there. / I said nothing about it because of his ife’s being there.

因为他妻子在那儿，我对此事只字未提。

比较：because, since,as和for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hy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。

I do it because I like it. = I like it so I do it.

We ent by bus because it as cheaper. = It as cheaper so e ent by bus.

He 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”= no that )， 较为正式， 语气比because弱。

Since you are free today, you had better help me ith my mathematics.

Since you don't trust him, you should not employ him.

No (that) you are gron 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)。

As it is raining, you’d better take a taxi.

As you are tired, you had better rest.

I ent to bed early, as I as 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。

He could not have seen me, for I as not there.

He seldom goes out no, for he is very old.