八年级英语下册Wordbank教案(新版)牛津上海版
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Word bank
原因状语从句
教学目标：1.学习原因状语从句的用法
2.掌握because, since, as, now that的区别
3.for 引导的并列句与原因状语从句的辨析
教学重点：1.学习原因状语从句的用法
2.掌握because, since, as, now that的区别
3.for 引导的并列句与原因状语从句的辨析
教学难点：1.掌握because, since, as, now that的区别
2.for 引导的并列句与原因状语从句的辨析
一、课前预习：
认真预习教材有关原因状语从句的知识点，系统了解原因状语从句的用法。
二、课堂活动：
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 didn’t 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 doesn’t work, let]s try another.
Since/ Now that you feel ill, you'd 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 didn’t go to school yesterday _________ I was ill.
2. ________ everybody is here, let’s 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 don’t we start at once?
6. Bill won’t make any progress ________ he doesn’t 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 didn’t go to school.
He was ill, _______ he didn’t go to school.
3) He couldn't walk because his leg was broken.
He couldn't 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.