1、2.原因状语从句原因状语从句表示主句中动作或状态发生的原因或理由, 可位于主句之前,之后或插在主句中间。主句表示结果, 从句表示原因, 主要 由 because, as, since, for,seeing ( that), considering ( that), now (that), in that, not . because 等引导。1)because “因为, as 由于”, since “ 既然”, for “ 因为”because意为“因为”, 表示直接的原因或理由, 着重点在从句, 用于回答why,语气最强。He is absent today because he is i
2、ll.当主句为否定句时, 从句because须用逗号与主句隔开, 否则容易引起歧义。I didnt visit him, because I wanted to borrow some books.我没去拜访他, 因为我想借几本书。I didnt visit him because I wanted to borrow some books.我不是因为想借几本书才去拜访他的。 as意为“由于”, 表示十分明显的原因, 所引导的从句常位于主句之前, 有时也可位于主句之后, 一般说明因果关系, 着重点在主句, 原因或理由只是附带说明, 不用于回答why的问题, 常用于口语。As it is sno
3、wing, we shall not go to the park.As this book is written in simple English, it is suitable for beginners.since意为“既然, 由于”时表示对方已知的、无须加以说明的既成事实的理由, 只是一个附带说明。since = as it is the fact that .全句中心在主句。如从句表示的原因不是确定的事实, 就不能用since,通常用because.Since everybody is here, lets begin our discussion.Since you seem t
4、o know them, why dont you introduce me to them?for是一个并列连词, 由for连结的表原因的句子常看作并列句, 它只提供一些补充说明或对前一个分句加以解释, 不可前置。与because 不同的是:because引导的从句位置可前可后, 而for引导的分句只能后置, 且往往须用逗号或分号与前一个分句分开。I didnt go to see him, for a heavy snow was falling.The days were short, for it was now December.有时, for引起的从句并不表示原因, 而是表示一种推
5、断或解释, 而because则不能。Someone in the house must be ill, for a doctor has just come out.He couldnt have seen me, for I was not there.一、填入恰当的连词1. I didnt go to school yesterday _ I was ill.2. _ everybody is here, lets begin our meeting.3. _ you are in poor health, you should not stay up late.4. I asked he
6、r to stay to tea, _ I had something to tell her.5. _ all the passengers are here, why dont we start at once?6. Bill wont make any progress _ he doesnt study harder than before.7. He might have gone to bed, _ the light went out. 1.because 2.Since 3.As 4.because 5.Since 6.because 7.for二、填入恰当的连词1. _ yo
7、u do not understand, I will explain again.2. _ Jane was the oldest in this family, she had to look after the others.3. He must be ill, _ he is absent today.4. The teacher must be strict with you _they want you to make great progress.5. _your father is well again, you no longer have anything to worry
8、 about.6. The day breaks, _the birds are singing.7. _ you are ill, youd better go to see the doctor.8. _ she was late for class, she had to say sorry.1.since 2. As 3. for 4. because 5. Since 6. for 7. Since 8. As 2)用下列短语引导:seeing (that) “鉴于, 既然”, considering (that) “考虑到” now (that) “既然”, in that “因为
9、”, not . because “不是因为”not thatbut that “不是因为而是因为, seeing that与considering that同义, 含义近似since,所引导的句子中心在主句, 重在强调结果。Seeing that the weather is bad, well stay at home.Considering that they are newcomers, theyve accomplished a lot.now that的含义与since(“既然”）接近, 区别在于:since表示原先已存在的情况, 而now that表示由于新情况的出现而促成某事发
10、生。 Now that it has stopped raining, lets start at once.Now that you are all here, lets try to reach a decision.in that作“因为”解时, 由于介词in的含义是指“在方面”, 有限制作用, 因此多指由于某一方面的原因或理由, 不能位于句首。I like the city, but I like the country better in that I have more friends in the country.I could understand his point of v
11、iew, in that Id been in a similar position myself.not . because意为“不是因为”, 该结构中的not否定because。 She didnt marry you because you had money.她不是因为你有钱才嫁给你。The machine didnt stop because the fuel was used up.机器不是因为燃料耗尽才停下来的。 not that . but that作“不是因为而是因为”解。Not that I dont like the film, but that I have no ti
12、me for it.He felt a bit worried, not that they were not working hard, but that they didnt pay enough attention to safety.家庭作业选择恰当的答案1. The man cant get on the bus _ there is no room on it. A. though B. because C. until D so that 2. _ her daughter hadnt come back, _ she looked worried. A. Because, /
13、B. Because, so C. Though, but D. Though, /3._ youve got a chance, you might make full use of it. A. Now that B. After C. Although D. As soon as4. He found it difficult to read, _ his eyesight was beginning to fail. A. and B. for C. but D. or5. A man cannot smile like a child, _ a child smiles with h
14、is eyes, while a man smiles with his lips alone. A. so B. but C. and D. for1.B 2.A 3.A 4.B 5.D1._ nobody was very interested in it, they decided to cancel the trip.A. Even thoughB. As soon as C. WhileD. Seeing that2._ our country has so many good table-tennis players, we have to decide on the best o
15、nes to take part in the game.A. Although B. SinceC. If D. While3. Not that John doesnt want to help you, _ its beyond his power.A.but that B.for that C.and that D.in that4. Animals suffered at the hands of man_ their habitats were destroyed by people to make way for agricultural land.A.in which B.fo
16、r which C.so that D.in that5._ Tom has no interest in piano, there is no point pushing him to learn it.A.Now that B.In case C.Even if D.As if(D； B； A； D； A)1._ youve got a chance, you might as well make full use of it. A. Now that B. After C. Although D. As soon as2. He found it increasingly difficu
17、lt to read, _ his eyesight was beginning to fail. A. and B. For C. But D. or3. 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. for4. I didnt go _ I was afraid.A. Since B. For C. Because D. Though5. _ it was raining, _ we
18、 stayed at home.A. Because, so B. Because ,/ C. Because ,for D. If ,so6. I said nothing about it _ his wife was there. A. since B. so that C. because D. unless7. _ the weather is so bad, we have to delay our journey. A. before B. since C. till D. After8. _ it is raining, youd better take a taxi.A. b
19、efore B. as C. till D. after9. You shouldnt get angry just _ some people speak ill of you. A. since B. so that C. becauseD. unless10. _ you are here, youd better stay. A. before B. Now that C. till D. after11. I hurried _I wouldnt be late for class. A. since B. so that C. as if D. unless12. I saw Mr
20、. Smith last Sunday. We had not seen each other _I left London. A. as B. before C. since D. till13. _ you are so weak, youd better stay at home. A. Since B. For C. Because D. Though14. Im sorry youve been waiting so long, but itll still be some time _ Brian get back.A. before B. since C. till D. aft
21、er15. Did you return Freds call? I didnt need to _ Ill see him tomorrow. A. though B. unless C. when D. Because16. Accustomed to_ the steep mountains, he had no difficulty reaching the top. A. climbing B. climb C. having climbed D. have climbed17. _ weve no money, we cant buy it. A. though B. unless C. when D. As1-5: ABDCB 6-10: CBBCB11-15: BCAAD AD
