原因状语从句(教案)

原因状语从句

教学目标：1.复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.复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《中考零距离—系统复习集》P132-133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 did n’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 s tart 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.

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, you’d 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 can’t get on the bus ______ there is no room on it.

A. though

B. because

C. until D so that

2. ______ her daughter hadn’t come back, ______ she looked worried.

A. Because, /

B. Because, so

C. Though, but

D. Though, /

3._______ you’ve got a chance, you might make full use of it.

A. Now that

B. After

C. Although

D. As soon as

4. He found it difficult to read, _______ his eyesight was beginning to fail.

A. and

B. for

C. but

D. or

5. 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