Unit 8--第3课时 （内文）-【学导练】2026年八年级下册英语课件PPT（沪教版）

该初中英语课件聚焦八年级下册Unit 8原因状语从句，涵盖引导词（because, since, as, for）区别及because与because of用法。课堂导入结合“地球与宇宙探索”主题，通过科幻情境（如UFO、外星探索）搭建学习支架，连接主题与语法知识。 其亮点在于情境化语法教学，以科幻故事（如外星探索语法填空）培养语言能力，引导词辨析训练提升思维品质，结合宇宙探索主题渗透文化意识。实例丰富（填空、单选等），教师可高效教学，学生提升语言运用与思维能力。

英语 八年级 下册 配上海教育版 返回目录 英语 八年级 下册 配上海教育版 Unit 8 Imagine that! 返回目录 英语 八年级 下册 配上海教育版 第3课时 Grammar 返回目录 英语 八年级 下册 配上海教育版 目 录 CONTENTS 01 语法聚焦 02 课堂练习 返回目录 英语 八年级 下册 配上海教育版 原因状语从句 1. 定义： 在句中用来说明主句原因的句子叫作原因状语从句。 2. 常用引导词: because(因为)，since(既然)，as(由于)，for(因为)等。 3. 时态： 原因状语从句的主句如果为一般过去时，则从句须用表示过去的时态；主句如果为一般现在时，则从句可根据实际情况选用不同的时态。 语法聚焦 返回目录 英语 八年级 下册 配上海教育版 4. because, since, as和for的区别： 引导词 用法 举例 because 表示直接的、明确的原因，语气最强，常用于回答由why引导的疑问句，位于句首时要用逗号与主句隔开 【注意】because和so不可以同时出现在同一个句子里 —Why can't I go? 我为什么不能去？ —Because you're not old enough. 因为你年纪太小。 since 表示已知的、显然的原因，语气比because弱，一般位于句首 Since you are unable to answer, perhaps we should ask someone else. 既然你回答不了，也许我们该问问别人了。 返回目录 英语 八年级 下册 配上海教育版 引导词 用法 举例 as 表示附带说明的或双方已知的原因，含有对比说明的意味，语气比since弱，位置较为灵活 As it was getting late, I turned around to start for home. 由于天渐渐晚了，我转身向家出发。 for 语气较弱，所引出的句子一般放在后面，并且必须用逗号将其和主句隔开，表示附带说明的理由或推断 I cannot tell whether she is old or young, for I have never seen her. 我无法告知她是年老还是年轻，因为我从没见过她。 返回目录 英语 八年级 下册 配上海教育版 【拓展】because和because of 的区别 (1)because是连词，其后接原因状语从句或回答由why引导的特殊疑问句。如： He didn't come because he was ill. 他因为生病而没有来。 (2)because of是复合介词，其后接名词、代词或动名词。如： He didn't come because of his illness. 他因为生病而没有来。 返回目录 英语 八年级 下册 配上海教育版 一、用because，since，as， for或because of填空 1. —Why is he unhappy? —____________ he failed the English exam. 2. ___________ everyone is here, let's begin our discussion. 3. The sports meeting was cancelled __________________ the heavy rain. 4. It must have rained last night,____________ the ground is wet this morning. 课堂练习 Because Since because of for 返回目录 英语 八年级 下册 配上海教育版 5. _______ it was a public holiday, all the shops were closed. 6. He sold his car _________________ it was too small. 7. ____________ we were in the area, we should stop by and see them. 8. He had a traffic accident ____________ his carelessness. 9. We have the change of the four seasons _________________ the Earth travels around the Sun. 10. ________________________________ Jim was not ready, we went without him. As because / as Since because of because / as As / Since / Because 返回目录 英语 八年级 下册 配上海教育版 二、单项填空 (　　)1. You needn't tell Jim the good news _________ I've told him already. （原创题） A. because of B. so C. for D. because (　　)2. Chengdu is a city in China that has two airports _____ the opening of Chengdu Tianfu International Airport. （原创题） A. since B. because C. because of D. as D C 返回目录 英语 八年级 下册 配上海教育版 (　　)3. _____ the rocket is ready to take off, let's get to the observation（观察）area. （原创题） A. So B. Since C. For D. Because of (　　)4. I like learning about stars, _____ they look beautiful in the night sky. （原创题） A. because of B. as C. so D. since B B 返回目录 英语 八年级 下册 配上海教育版 (　　)5. The satellite sent back no signals, _____ a small part of it was broken. （原创题） A. because of B. for C. since D. so B 返回目录 英语 八年级 下册 配上海教育版 三、语法填空 　 We were on our way back to the Earth from another planet. Suddenly, 1._______ UFO appeared and it made our spaceship land on another planet. On the planet, a very strange-looking alien 2.____________ (meet) us. He took my friends and 3.____________ (I) to see his master. Then we came to a very 4.____________ (stranger) room. There were many 5.____________ (alien) standing in line. All of them had four eyes, two heads and six legs. a met me strange aliens 返回目录 英语 八年级 下册 配上海教育版 They had a white body and no hair. To our surprise, we 6.__________________ (call) “aliens” by them. The planet looked 7.____________ a prison (监狱). They gave us some food. However, none of us ate the food 8._______________ we were frightened. The next day, they gave us a long list of things 9.___________ (do), but we couldn't understand them at all. They put us in a small room. Luckily, we found a way out and returned to the Earth 10.____________ (safe) in the end. were called like because / as to do safely 返回目录 英语 八年级 下册 配上海教育版 THANKS! 返回目录 英语 八年级 下册 配上海教育版 $