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1、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 didnt go to school yesterday because I was ill. 我昨天没去上学,因为我生病了。 2. Since everybody is here, lets begin our meeting. 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
2、 stay to tea, for I had something 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 didnt go, because I was afraid. Since /As the weather is so bad, we have to delay our journey. 2
3、)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 weather is cold, I stay at home.(同义句) I stay at home, for the weather is c
4、old. 2、because习惯上不及so连用 汉语习惯上说“因为所以”,但英语习惯上却不能将 so及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 从句及 because of短语的转换 Because引导的原因状语从句有时可及because of 短语转换,because of后
5、加的原因可以为好或坏 ,但最正规的还是because。He cant come because he is ill. / He cant 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 wifes 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
6、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 ey
7、esight 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 从句及 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及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 didn't 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
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