2019中考英语考点：原因状语从句详解

知识点

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等。例如

1.I didn’t go to school yesterday because I as ill. 我昨天没去上学，因为我生病了。

2. Since everybody is here, let’s begin our eting. 既然大家都来了, 让我们开始开会吧.

3. As you are in poor health, you should not stay up late. 既然你身体不好, 你就不该熬夜.

4.I asked her to stay to tea, for I had sothing to tell her. 我请她留下来喝茶,因为我有事要告诉她.

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hy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 as afraid.

Since /As the eather is so bad, e 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, becaus e / 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 eather is ld, I stay at ho.(同义句) I stay at ho, for the eather is ld.

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 as raining, e stayed at ho. / It as raining, so e stayed at ho.

误Because it as raining, so e stayed at ho. 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 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。

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 as beginning to fail.

A. and B. for C. but D. or

解析 “his eyesight as beginning to fail”是“he found it increasingly difficult to read”的原因， 本题应选用可以表示原因的连词for引导原因状语从句。