Unit 8 语法--原因状语从句讲练 2025-2026学年沪教版英语八年级下册

第8讲 新沪教牛津版八下Unit8语法-原因状语从句 Part 1 原因状语从句讲解 一、原因状语从句的定义:用一个句子来解释另一个动作或事情发生的原因。 例:I was late because I got up late. 二、引导原因状语从句的连词 because 表示直接、明确的原因,回答由why提出的问题。 -Why are you tired? -Because I am ill. since 表显而易见的原因,意为“既然 …, 鉴于…”, 多放在句首。 Since the rain has stopped, let's go for a walk. as 表示双方都知道的原因,多用于口语中,常译为“由于” As it is raining, you'd better take a taxi. for 所说的理由是一种补充说明,从句一般不 放在句子的开头。 I decided to stop and have lunch, for I was feeling quite hungry. because of =as a result of, 后接名词或动名词短语。 He didn't pass the exam because of his carelessness. 三、易错点总结 1.辨析一:because 与so 不可连用(“一山不容二虎”) 正确: Because it was raining, we stayed at home. (√) =It was raining, so we stayed at home. (√) 错误: Because it was raining, so we stayed at home.( ) 2.辨析二:because 从句与 because of短语的转换 核心区别: because后接_,because of后接_ 转换示例: He can't come because he is ill. = He can't come because of his illness. 3.辨析三:引导词之间的核心差异(中考高频考点) 语气强度:because>since>as>for 功能侧重: because表_原因(答why) since/as表_原因 for表_ Part 2 随堂练习 一、用 because, because of, since, as, for 填空 1. -Why is he unhappy? - _ he failed the English exam. 2. _ everyone is here, let’s begin our discussion. 3. _ the bad weather, the Greens had to put off their travel plan. 4. We should be more careful, _ it is already dark. 5. _ it was a public holiday, all the shops were shut. 6. He sold his car _ it was too small. 7. _ you won’t help me, I must do the job myself. 8. He had a traffic accident _ his carelessness. 9. This is _ the Earth is travelling around the Sun. 10. _ Jim was not ready, we went without him. 二、单项选择题 1. The exam must be very difficult, _ many students failed. A. though B. so C. for D. but 2. _ everyone is here, let's begin our discussion right away. A. If B. When C. Now that D. Even if 3. — Did you return Ted's call? — I did not need to _ I will see him tomorrow. A. though B. unless C. because D. when 4.— His friend wants to go swimming _ it’s very hot. —It’s OK. But don’t allow him to do that_! A. so; alone B. so; lonely C. since; alone D. since; lonely 5. You shouldn't walk alone outside right now, _ it's a bit late. A. so B. but C. although D. for 6. Betty didn’t go to see the film yesterday _ she was ill. A. because B. but C. until D. if 7. _ he needed money for his marriage, he had to do a part-time job after work. A. As B. Though C. Because of D. So that 8.-He sleeps with the window open _ it’s really cold. -That’s _ he wants to let fresh air in. A. until; because B. unless; why C. until; why D. unless; because 9. It is difficult to practice in winter _ the weather is so cold. A. so B. and C. or D. because 10. _ it’s raining hard, let’s stay at home. A. So B. Since C. However D. Otherwise 11. Li Ming didn’t go to school _ he had the flu. A. because B. and C. so D. but 12. Bring a coat _ it will soon become cold. A. because B. so C. but D. and 13. _ you know English is important, you should learn it well. A. Since B. Or C. Because of D. But 14. _ it was really snowy, it _ me a long time to get there. A. Because; took B. Because; takes C. For; spent D. Because; cost 15. We should read books in the place with plenty of light, _ it is good for our eyes. A. so B. or C. because D. but 三、根据所给的汉语内容,用英语完成下列句子。(每空限填一词) 1. 他因为一场事故失去了双亲。 He lost his parents _ _ an accident. 2. 既然你已经在这儿了,何不多待两天? _ you are here, why not stay for two more days? 3. 你生病了,最好去看看医生。 _ you are ill, you’d better go to see a doctor. 4. 我没去那里,因为我不想见到他。 I didn’t go there _ I didn’t want to see him. 5. 因为要赶去火车站,他们很早就起床了。 _they needed to go to the train station, they got up early. Part 3 课后练习 一、单项选择题 1. —Is everyone here today? —No. Tom is at home _ he has got a bad cold. A. because B. if C. until D.but 2. I’m dreaming of a white Christmas _ it never snows in winter in my hometown. A. or B. because C. if D.so 3. — Do you think I should wear an orange shirt today? — Yes. _ orange can bring you good luck, it is good for your interview. A. Though B. As C. But D. While 4. — When shall we start, sir? — _ every one of us is here, let’s start right now. A. Before B. Until C. Since D. While 5. —The sky is much bluer _ we have taken action to protect the environment. —Yes. A. because B. before C. until D. unless 6. — Tom, why do you look so tired today? — Oh, I didn’t get enough sleep _ I worked for 12 hours yesterday. A. although B. since C. until D. because 7. We didn’t go to the park yesterday _it rained heavily all day. A. so B. because C. although D. until 8. Many older buildings in Dalian look beautiful _ workers make them look as good as new. A. while B. if C. although D. because 9. This pet shop is losing its customers _ its staff work slowly and often make mistakes. A. so B. because C. until D. although 10. It’s important to keep learning about new ideas and technology _ the world changes fast. A. so B. or C. unless D. since 11. Most people like the character that looks like Guan Yu, a famous Chinese general in the video games, _ they believe he can bring good fortune (财运). A. as B. although C. while D.but 12. Bob watches news every day _ he wonders what’s happening around the world. A. although B. because C. unless D. so 13. — It’s said that Xuzhou Barbecue is famous and delicious. — _ we are here, why not go and try it? A. Since B. If C. Until D. Whenever 14. _ you didn’t answer my call, I left a message on WeChat. A. If B. As C. While D. Before 15. It’s so hard for us to say goodbye _ we have so many happy days to remember. A. because B. though C. but D. so 二、根据句意,用 as, because, 或者 since 连接两个句子。 1. Rain has fallen. The air is cooler. _ 2. You can’t answer the question. I’ll ask someone else. _ 3. He introduced me to teachers. I was new. _ 4. You are taking part in this activity. I will take part in it too. _ 5. The ground is wet. It rained last night. _ ( 第 1 页 共 8 页 ) 学科网(北京)股份有限公司 $