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。
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