原因状语从句

原因状语从句

常用引导词：because, since, as, for

特殊引导词：seeing that, now that, in that, considering that, given that. My friends dislike me because I’m handsome and successful.

Now that everybody has come, let’s begin our conference.

The higher income tax is harmful in that it may discourage people from trying to earn more.

要点:由连词because, since, as引导, 也可由for, now that 等词引导

1.I didn’t go to school yesterday because I was ill.

我昨天没去上学，因为我生病了。

2. Since everybody is here, let’s begin our meeting.

既然大家都来了, 让我们开始开会吧.

3. As you are in poor health, you should not stay up late.

既然你身体不好, 你就不该熬夜.

4.I asked her to stay to tea, for I had something to tell her.

我请她留下来喝茶,因为我有事要告诉她.

难点——because , since , as , for,辨析

1）　because语势最强，用来说明人所不知的原因，回答why提出的问题。当原因是显而易见的或已为人们所知，就用as或 since。

I didn’t go, because I was afraid.

Since /As the weather is so bad, we have to delay our journey.

2）　由because引导的从句如果放在句末，且前面有逗号，则可以用for来代替。但如果不是说明直接原因，而是多种情况加以推断，就只能用for。

He is absent today, becaus e / for he is ill.

He must be ill, for he is absent today.

3) as和for的区别：

通常情况下，as引导的从句在主句前，for引导的从句在主句后。例：

As the weather is cold, I stay at home.（同义句）

I stay at home, for the weather is cold.

练习

一、在下列句子的空格中填入适当的连词(每空一词)：

1. ________ Jane was the eldest, she looked after the others.

2. ________ you know it, I won't repeat it.

3. He didn't hear the knock at the door ________ he was listening to the radio.

4. —Why didn't you come?

— ________ my father wouldn't let me.

5. ________ ________ everybody is here, let's begin the discussion.

二、句型转换(把下列复合句转换为简单句)：

I)把从句简化为 because of 结构：

1. He lay in bed because he had caught a bad cold.

2. He couldn't walk because his leg was broken.

3. I came back because it was raining.

4. They stayed in because the weather was bad.

5. We didn't get home till after midnight because we had missed the bus. II)把从句简化为分词短语：

6. As he is a warmhearted man, he is always ready to help others.

7. As he saw nobody in, he decided to leave a note.

8. Because he didn't understand its meaning, he asked the teacher to explain the word.

9. As he had lived in Beijing for many years, he knew the city very well.

10. As I have not seen the film, I can't tell you what I think of it.

11. As they were influenced by Lei Feng's example, they did a lot of good deeds.

12. As he was brought up in the countryside, he was not used to the city life.

III)把从句简化为形容短语：

13. Because he was afraid of being late for class, Bob ran to school as fast as he could.

14. As he was full of ear, Crusoe left the cave in a hurry.

15. As he was anxious for a quick decision, the chairman called for a vote.

三、单选

1 The meeting didn't start___ everyone was there.

A. because

B. until

C. why

D. if

2 He ___ home ___ she was satisfied ___ his answer yesterday.

A. didn't go; until; with

B. wasn't go; after; to

C. doesn't go; before; with

D. didn't go; until; to

3 They didn't start the work ___ their teacher came back.

A. until

B. while

C. as soon as

D. if