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1. 常见引导词
原因状语从句的常见引导词有以下几个because,since,as,for,它们所表示的原因语气逐渐衰弱。
We are obliged to them because some of these languages have since vanished, as the peoples who spoke them died out or because assimilated and lost their native languages.(2004 Part B)
By contrast, the process of personal growth is much more difficult to determine, since by definition it is a journey and not the specific signposts or landmarks along the way.(1995-text2)
2. 其他引导词
原因状语从句还有seeing(that),considering(that),given that“鉴于、考虑到”;now(that)“既然”;in that,for the reason that
Now that women have claimed equality,their no longer need to be treated differently from men.
A great many students express their frustration with our library in that there are usually long lines waiting for assistance.
3. because和because of的区别
Because 从属连词+句子
Because of 介词短语+名词短语/动名词短语
All schools and workplaces have been shut down because there will be tornado in two hours.
—All schools and workplaces have been shut down because of the forthcoming tornado.
He gave up taking domestic Postgraduate Entrance Examination because he has obtained the offer of American University.
—He gave up taking domestic Postgraduate Entrance Examination because of his obtaining the offer of American University.
4.测试题(原因状语从句)
1. ( )He found it increasingly difficult to read, __his eyesight was beginning to fail.
A. and B.since C.but D.or
2. ( )A man cannot smile like a child,__a child smiles with his eyes, while a man smiles with his eyes, while a man smiles with his lips alone.
A. so B.but C.and D.for
3. ( )Some experts attribute the stress-reducing, health-related benefits of hugging to the release of oxytocin, often called”the bonding hormone”__it promotes attachment in relationships, including that between mother and their newborn babies.
A.because B.unless C.though D.until
5.答案解析:
1. 正确答案: B
主从句非常明显为因果关系,因此B为正确项。
2. 正确答案: D
后面一句话是对前面“A man cannot smile like a child"这一论断的解释,用for表示原因,因此D为正确项。
3. 正确答案: A
主句表明“专家把拥抱减压和对健康的益处归因于oxytocin的释放”,这个被称为“bonding hormone”,而bonding和attachment in relationships语义相近,promote 和主句的积极色彩-致,所以后一句是对前一句的原因解释。因此A为正确项。
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