-原因状语从句语法讲解.doc

A、引导原因状语从句的连词 原因状语从句一般由从属连词because, as, since，now that引导。B、because, as, since和now that的区别：1、because“因为”，表示直接的原因，语气最强。1）why提问的句子，必须用because回答。2）because的从句常放在主句之后。3）because 不能与so连用。4）because+ 从句；because of+ 名词短语I missed the train because I got up late.He was angry not because we were late but because we made a noise.-Why didnt he come yesterday? -Because he was ill.2、as“因为”，语气较弱，一般放在主句前，中间用逗号隔开，表示的是明显的原因。As he was not well, I decided to go there without him.As it was raining hard, we had to be indoors.3、since/ now that“既然”，一般放在主句前，中间用逗号隔开，表示的是明显的原因或众所周知的事实。Since/ Now that this method doesnt work, lets try another.Since/ Now that you feel ill, youd better not go to work.C、for 引导的并列句与原因状语从句的辨析并列连词for“因为”，引导的不是从句，而是并列分句，只能放在主句之后，不能放在句首，常用逗号把它和前面的分句隔开。对主句补充说明理由或推断原因。It rained last night, for the ground is wet. She must have gone out early, for she had not come for breakfast.Exercise: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 her 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. 二、 改写句子,保持句意不变1) The ship changed its course because there was a storm.The ship changed its course _ _ _ _.2) Because he was ill, he didnt go to school. He was ill, _ he didnt go to school.3) He couldnt walk because his leg was broken.He couldnt walk _ _ his _ leg.4) I came back because it was raining heavily. I came back _ _ the _ rain.三、课堂小结：_四、回家作业：一、填入恰当的连词1. _ you 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 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.二、 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 that2. _ her daughter hadnt come back, _ she looked worried. A. Because, / 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 his eyes, while a man smiles with his lips alone. A. so B. but C. and D. for五、学生反馈：（在完成回家作业的过程中存在的问题）_六、教师反馈：（在批改学生回家作业中发现的问题）_Keys：A、引导原因状语从句的连词：because, as, since，now thatB、because, as, since和now that的区别：1、because：“因为”，表示直接的原因，语气最强。1）why提问的句子，必须用because回答。2）because的从句常放在主句之后。3）because 不能与so连用。4）because+ 从句；because of+ 名词短语2、as：“因为”，语气较弱，一般放在主句前，中间用逗号隔开，表示的是明显的原因。3、since/now that：“既然”，一般放在主句前，中间用逗号隔开，表示的是明显的原因或众所周知的事实。C、for 引导的并列句与原因状语从句的辨析：并列连词for“因为”，引导的不是从句，而是并列分句，只能放在主句之后，不能放在句首，常用逗号把它和前面的分句隔开。对主句补充说明理由或推断原因。课堂练习：一、1.because 2.Since 3.As 4.because 5.Since 6.because 7.for二、1.because of the storm 2. so 3. because of broken 4. because of heavy回家作业：一、1.since 2. As 3. for 4. because 5. Since 6. for 7. Since 8. As二、1.B 2.A 3.A 4.B 5.D