Unit 8 Imagine that！Section 2-Grammar课件 2025-2026学年沪教版八年级英语下册

该初中英语课件聚焦原因状语从句，通过生活情境问题（如“女孩为何戴帽子”“男孩为何撑伞”）导入，以Why提问引出because用法，再结合故事总结引导分析as、since、for及because of的区别，搭建从具体情境到抽象语法的学习支架。 其亮点在于情境化设计与梯度化练习结合，通过对比because与because of的用法、辨析as/since/for的语气差异，培养学生思维品质。表格总结连接词用法、多样化练习（选择、填空、翻译）提升语言能力，助力学生掌握语法规则，教师可高效开展教学。

8B Unit 8 Imagine that! Grammar：The adverbial clauses of reason (原因状语从句) COMPANY Lead-in Why does the girl wear a hat and sunglasses? The girl wears a hat and sunglasses because the sun shines brightly./ Because the sun shines brightly, the girl wears a hat and sunglasses. Why does the boy hold an umbrella? The boy holds an umbrella because it is raining./ Because it is raining, the boy holds an umbrella. Why does the boy run fast? The boy runs fast because he is late./ Because the boy is late, he runs fast. Presentation Adverbial clauses of reason tell us why things happen. 原因状语从句告诉我们事情发生的原因。 Read the summary of the story on page 117. Pay attention to the words in bold. Then answer the questions. 1. Why was there a loud noise last night? 2. Why couldn’t the spaceship fly? The spaceship couldn’t fly because of the damage. There was a loud noise because a spaceship crashed in the forest. Because a spaceship crashed in the forest, there was a loud noise. Because of the damage, the spaceship couldn’t fly. When do we use because / as / since? When do we use because of? When do we use a comma(,)? Because : 强调明确直接的原因 The boy holds an umbrella because it is raining./ Because it is raining, the boy holds an umbrella. Why does the boy hold an umbrella? 强调直接原因 回答用why提问的句子，必须用because Because 和so不能同时使用 because +原因状语从句 because of+名词/代词/动名词 He didn’t come because he was ill./ He didn’t come because of his illness. Since 表示已知的、显然的原因，常译为“既然”，一般位于句首 Since everyone is here, let’s start the meeting. (已知的、大家都知道的情况) Now that everyone is here, let’s start the meeting. as表示附带说明的或双方已知的原因，语气比 because 和 since 弱。常译为“由于” As it was a public holiday, all the shops were closed. 由于这是一个公共假日，所有商店都关门了。 (附带说明) For作并列连词，连接并列句，表示附带说明的理由或推断，常译为“因为”，一般放在后面，且必须用逗号与主句隔开 It must have rained last night, for the ground is wet. 昨晚一定下雨了，因为地面是湿的 (附带说明的理由) 连接词 用法 because “因为”: ①表示直接原因 ②回答why提问只能用because since “既然”: ①通常放句首;②后接已知、显然的原因;③有时候勉强的意味 as “由于”: 附带说明的或双方已知的原因，如天气、身体情况 for “原因”: 对某一事实进行解释说明。 前边必须要有逗号，放在句中。 because、since、as、 for 都不能跟so 连用 because、since、as放在主句之前要用逗号隔开 The police officer asked Tom some more questions about the aliens. Match the questions with the answers. Then use them to complete the police officer’s notes with as, since or because. Complete the police officer’s notes with as, since or because. Police officer’s notes (1) (because of) ____________________________________ _________________________________________________ (2) (because)______________________________________ _________________________________________________ (3) (as)___________________________________________ _________________________________________________ (4) (Since)________________________________________ _________________________________________________ Tina was sure that something landed in the forest near the hills because of a loud noise last night. Tina and Tom hid behind some bushes because they heard some voices speaking a strange language. Tina and Tom ran away as an alien saw them and made a terrible noise. Since no one else saw these aliens, Tina and Tom’s father refused to believe them. More Practice 一、选择题 1. He didn’t go to school yesterday _________ he was ill. because B. because of C. for D. since 2. __________everyone is here, let’s start our class. Because B. Since C. For D. Because of 3. We stayed at home ________________ the heavy rain. because B. because of C. for D. since 4. It must have rained last night, ________ the ground is wet. A. because B. for C. as D. since A B B B 5. ______I don’t know the answer, I can’t help you. for B. because of C. because D. as 6. She cried ______sadness. because of B. since C. as D. for 7. I like reading_________ it can open my eyes to the world. As B. since C. for D. because 8. The days get shorter,_______ winter is coming. A. as B. since C. for D. because D A D C 二、用because, as, since, for, because of填空(每词限用一次) I can’t join you _______________ I have to finish my homework. _______it is late, we have to go home now. He laughed _________________ the funny story. The bird flew away, _____________a boy ran towards it. __________you have known the truth, I won’t say more. because As because of for Since 三、翻译句子 因为时间不够，他放弃了这个计划。 ________________________________________________________________ 2.因为天气很好，我们决定去公园。 ________________________________________________________________ 3.他一定累了，因为他工作一天了。 ________________________________________________________________ 4.由于堵车，他上学迟到了。 ________________________________________________________________ He gave up the plan because of lack of time. As the weather is fine, we decide to take a walk in the park. He must be tired, for he worked all day. He was late for school because of traffic jam. $