原因状语从句(学案).doc

原因状语从句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.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. 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、 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, / 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 asKeys：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。课堂练习：一、1.because 2.Since 3.As 4.because 5.Since 6.because 二、1.because of the storm 2. so 3. because of broken 4. because of heavy三、1.B 2.A 3.A