I. 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.
II. 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.
Key:
I. 1. As 2. Since 3. because 4. Because 5. Now that/Seeing that
II. 1. He lay in bed because of a bad cold.
2. He couldn't walk because of a/his his broken leg.
3. I came back because of the rain.
4. They stayed in because of the bad weather.
5. We didn't get home till after midnight because of missing the bus.
6. Being a warm-hearted man, he is always ready to help others.
7. Seeing nobody in, he decided to leave a note.
8. Not understanding its meaning, he asked the teacher to explain the word.
9. Having lived in Beijing for many years, he knew the city very well.
10. Not having seen the film, I can't tell you what I think of it.
11. Influenced by Lei Feng's example, they did a lot of good deeds.
12. Brought up in the countryside, he was not used to the city life.
13. Afraid of being late for class, Bob ran to school as fast as he could.
14. Full of ear, Crusoe left the cave in a hurry.
15. Anxious for a quick decision, the chairman called for a vote.
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原因状语从句的用法
because引导的原因状语从句一般放于主句之后，because从句位于句首时要用逗号分开，放在句末 时，可不用逗号分开。because表示直接原因， 语气最强， 最适合回答 why引导的疑问句。
- 高二英语语法知识讲解：地点状语从句和原因状语从句