原因状语从句语法讲解

1、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

2、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

3、, 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

4、. 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

5、 _ 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 be

6、cause 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

7、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

8、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. A

9、fter 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

10、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