原因狀語從句

1、原因狀語從句原因狀語從句表原因，引導(dǎo)原因狀語從句的從屬連詞主要的有because, as, since, for，seeing (that), now (that), considering (that)，in that等。以下逐一介紹常見的原因狀語從句的引導(dǎo)詞：because引導(dǎo)的原因狀語從句一般放于主句之后， because表示直接原因， 語氣最強， 最適合回答 why引導(dǎo)的疑問句。例如： I do it because I like it. 我做這件事是因為我喜歡。 注意： “not . because”結(jié)構(gòu)中的not否定的是because引導(dǎo)的整個從句， 例如： The country

2、 is not strong because it is large. 國強不在大。 since引導(dǎo)的原因狀語從句一般放于主句之前表示已知的、 顯然的理由(通常被翻譯成“既然”)， 較為正式， 語氣比because弱。例如： Since you are free today, you had better help me with my mathematics. 既然今天你休息， 你最好幫我補習(xí)數(shù)學(xué)。 注意： seeing (that)， now (that)， considering (that)， in that這幾個詞匯與since引導(dǎo)的原因狀語從句意思相近， 都表示“既然”。例如： S

3、eeing (that) he refused to help us, theres no reason that we should now help him. 他既然曾經(jīng)拒絕幫助我們， 我們現(xiàn)在沒有理由要來幫助他。Now (that) you are grown up, you should not rely on your parents. 既然你長大了， 就不應(yīng)該依靠你的父母了。Considering (that) everybody is here, lets begin our discussion. 既然大家都到了， 我們就開始討論吧。In that he is ill, he

4、feels unable to do it. 因為有病， 他覺得做不了那件事。 as 引導(dǎo)原因狀語從句時表示附帶說明的“雙方已知的原因”， 語氣比since弱， 較為正式， 位置較為靈活(常放于主句之前)。例如： As it is raining, youd better take a taxi. 既然在下雨， 你最好乘出租汽車。As you are tired, you had better rest. 既然累了， 你最好休息一下。I went to bed early, as I was exhausted. 我睡得早， 因為我筋疲力盡了。 for引導(dǎo)的原因狀語從句并不說明主句行為發(fā)生的直

5、接原因， 只提供一些輔助性的補充說明， for引導(dǎo)的原因狀語從句只能放于主句之后并且必須用逗號將其與主句隔開。例如： He could not have seen me, for I was not there. 他不可能見過我， 因為我不在那里。比較：because, since, as和for because語勢最強，表示不知道的原因用because，即說話人認(rèn)為聽話人不知道。因此because從句是全句最重要的部分，通常被放置于主語之后。 當(dāng)原因是顯而易見的或已為人們所知，就用as或 since。 I didnt go, because I was afraid. Since /As t

6、he weather is so bad, we have to delay our journey. for雖然表示不知道的原因，但因語氣比because弱得多，是可說可不說的話，只能位于主語之后，這時，for是并列連詞，如果不是因果關(guān)系，而是對前面主語內(nèi)容加以解釋或推斷時，只能用for。 He is absent today, because / for he is ill. He must be ill, for he is absent today.注1：除以上提到的大家比較熟悉的引導(dǎo)原因狀語從句的從屬連詞外，when有時也可引導(dǎo)原因狀語從句(when表示“既然”) I wont te

7、ll you when you wont listen. 既然你不想聽，我就不告訴你了。 注2：because習(xí)慣上不與so連用 漢語習(xí)慣上說“因為所以”，但英語習(xí)慣上卻不能將 so與because 連用： 因為下雨，所以我們呆在家里。 正：Because it was raining, we stayed at home. / It was raining, so we stayed at home. 誤：Because it was raining, so we stayed at home. 注3：because 從句與 because of短語的轉(zhuǎn)換 Because引導(dǎo)的原因狀語從句有

8、時可與because of 短語轉(zhuǎn)換，because of后加的原因可以為好或壞 但最正規(guī)的還是becauseHe cant come because he is ill. / He cant come because of his illness. 他因病不能來。 I said nothing about it because his wife was there. / I said nothing about it because of his wifes being there. 因為他妻子在那兒，我對此事只字未提。 考題1 _ youve got a chance, you might

9、 as well make full use of it. A. Now that B. After C. Although D. As soon as 答案 A 解析 主句與從句之間存在因果關(guān)系， 且“youve got a chance”表示一個顯而易見的原因， 因此應(yīng)選用表原因的now that。 考題2 He found it increasingly difficult to read, _ his eyesight was beginning to fail.A. and B. for C. but D. or答案 B 解析 “his eyesight was beginning

10、to fail”是“he found it increasingly difficult to read”的原因， 因此本題應(yīng)選用可以表示原因的連詞for引導(dǎo)原因狀語從句。 考題3 A man cannot smile like a child, _ a child smiles with his eyes, while a man smiles with his lips alone.A. so B. but C. and D. for 答案 D 解析 下劃線處之后的句子補充說明“a man cannot smile like a child”的原因， 應(yīng)選用for表原因。原因狀語從句練習(xí)題

11、I. 在下列句子的空格中填入適當(dāng)?shù)倪B詞(每空一詞)：1. _ Jane was the eldest, she looked after the others. 2. _ you know it, I wont repeat it. 3. He didnt hear the knock at the door _ he was listening to the radio. 4. Why didnt you come? _ my father wouldnt let me. 5. _ _ everybody is here, lets begin the discussion. II. 句型轉(zhuǎn)

12、換(把下列復(fù)合句轉(zhuǎn)換為簡單句)： I)把從句簡化為 because of 結(jié)構(gòu)： 1. He lay in bed because he had caught a bad cold. 2. He couldnt walk because his leg was broken. 3. I came back because it was raining. 4. They stayed in because the weather was bad. 5. We didnt get home till after midnight because we had missed the bus. II)

13、把從句簡化為分詞短語： 6. As he is a warmhearted man, he is always ready to help others. 7. As he saw nobody in, he decided to leave a note. 8. Because he didnt understand its meaning, he asked the teacher to explain the word. 9. As he had lived in Beijing for many years, he knew the city very well. 10. As I h

14、ave not seen the film, I cant tell you what I think of it. 11. As they were influenced by Lei Fengs example, they did a lot of good deeds. 12. As he was brought up in the countryside, he was not used to the city life. III)把從句簡化為形容短語： 13. Because he was afraid of being late for class, Bob ran to scho

15、ol as fast as he could. 14. As he was full of ear, Crusoe left the cave in a hurry. 15. As he was anxious for a quick decision, the chairman called for a vote. Key: I. 1. As 2. Since 3. because 4. Because 5. Now that/Seeing that II. 1. He lay in bed because of a bad cold. 2. He couldnt walk because

16、of a/his his broken leg. 3. I came back because of the rain. 4. They stayed in because of the bad weather. 5. We didnt get home till after midnight because of missing the bus. 6. Being a warm-hearted man, he is always ready to help others. 7. Seeing nobody in, he decided to leave a note. 8. Not understanding its meaning, he asked the teacher to explain the word. 9. Having lived in Beijing for many years, he knew the city very well. 10. Not having seen the film, I cant tell you what I think of it. 11. Influenced by Lei Fengs example, they did a lot of good