2026年中考英语语法之原因状语从句课件

初中英语语法 原因状语从句 单击此处编辑母版标题样式 单击此处编辑母版文本样式 第二级 第三级 第四级 第五级 2026/4/3 ‹#› 单击此处编辑母版标题样式 单击此处编辑母版文本样式 第二级 第三级 第四级 第五级 2026/4/3 ‹#› 单击此处编辑母版标题样式 单击此处编辑母版文本样式 第二级 第三级 第四级 第五级 2026/4/3 ‹#› 单击此处编辑母版标题样式 单击此处编辑母版文本样式 第二级 第三级 第四级 第五级 2026/4/3 ‹#› 单击此处编辑母版标题样式 单击此处编辑母版文本样式 第二级 第三级 第四级 第五级 2026/4/3 ‹#› 单击此处编辑母版标题样式 单击此处编辑母版文本样式 第二级 第三级 第四级 第五级 2026/4/3 ‹#› 单击此处编辑母版文本样式 第二级 第三级 第四级 第五级 一、基本概念 原因状语从句是英语中用于说明主句动作或状态发生原因的从句，修饰主句中的谓语动词，解释“为什么”会发生某事。 原因状语从句可放在主句前，也可放在主句后。 原因状语从句 3 二、引导原因状语从句的连词及用法 常用引导词because 表示直接、强烈的因果关系，通常用于回答“why” 引导的疑问句。 — Why didn’t you finish the work? 你为什么没完成工作？ — Because I ran out of time. 因为我没时间了。 1 4 since，表示已知的、显然的原因，意为“既然”， 引导的从句通常置于句首。 Since everyone is here, let’s start the discussion. 既然大家都到了，我们开始讨论吧。 Since you have known the truth, I don’t need to hide it. 既然你已经知道真相，我就不用隐瞒了。 2 5 as，表示较客观的原因，语气较弱，常译为“由于”， 引导的从句可置于句首或句中。 As it was raining heavily, we decided to stay at home. 由于雨下得很大，我们决定待在家里。 He couldn’t attend the meeting as he was ill. 由于生病了，他无法参加会议。 3 6 for，并列连词，引导的句子不能位于句首，且更强调 对主句的补充说明。 The ground is wet, for it rained last night. 地面是湿的，因为昨晚下过雨。 She didn’t buy the dress, for she thought it was too expensive. 她没买那条裙子，因为她觉得太贵了。 4 7 in that，意为“原因在于”，引导的从句放在主句后面， 通常用于主句进行比较的语境中。 She is different from her sister in that she is more outgoing. 她和她姐姐不同，原因在于她更外向。 Online learning is convenient in that it allows flexible study time. 在线学习很方便，原因在于它允许灵活的学习时间。 5 8 【注意】 ①because 不能与 so 连用。 ✅ Because he was late, we started without him. ❌ Because he was late, so we started without him. ✅ He was late, so we started without him. ②原因状语从句可位于主句前，要用逗号隔开。 Since you’re not interested, I won’t talk about it anymore. 既然你不感兴趣，我就不再提这件事了。 9 I love practicing English because it is like a fun game. 我爱练习英语，因为它就像场好玩的游戏。 Let's move to the next challenge since everyone already knows the answer. 既然大家都知道答案了，我们就移步到下一项挑战吧！ 主句在前，从句在后（通常不加逗号） 原因状语从句的位置很灵活，有2种情况： 1 2 从句在前，主句在后（从句后面要加逗号） Because it is like a fun game, I love practicing English. Since everyone already knows the answer, let’s move to the next challenge. 中文思维：因为我很累，所以我想睡觉。 错误英语：Because I am tired, so I want to sleep. （×） （在一个英语句子里，只能有一个“连词”，不能同时出现 because 和 so） 正确表达（二选一） I want to sleep because I am tired. （✔） I am tired, so I want to sleep. （✔） 避坑指南！—常见错误解析 “because”和“so”连用（大错特错！） 错误1： 提醒！ 就像Though和but不能连用一样，because和so也同样不能连用。这是出题老师最爱设置的陷阱之一！ since既可以表“因为”，也可以表“自从”。 Since you are my best friend, I will tell you the secret. 因为你是我最好的朋友，我会告诉你这个秘密。 (since表“因为”) I have lived in this city since I was born. 自从我出生，我就住在这座城市。 (since表“自从”，引导时间状语从句) 混淆“since”的两种意思 错误2： 原因从句表原因，引导词们要记清。 because 语气它最强，回答 why 它最忙。 since 既然已知晓，as 由于也用到。 for它是特殊嘉宾，对主句补充或推断。 切记 because 不配 so，位置灵活逗号保。 记忆口诀 Many students lose marks simply ________ they do not read the questions carefully. A．although B．so C．because D．before 模拟训练 ________ you can’t work out the problem, perhaps you need to ask your classmates for help. A．Though B．Unless C．Since D．Whether 模拟训练 句型转换。 Tom got up late. He missed the early bus. （用because合并为一句） ___________________________________________. Tom missed the early bus because he got up late 模拟训练 句型转换。 The little girl cried because she couldn’t find her mom. (对划线部分提问) ________________________? Why did the little girl cry 模拟训练 翻译句子。 我喜欢春天，因为春天很温暖。____________________________________. 既然你有空，帮我搬一下这个箱子吧。 ____________________________________. I like spring because it is very warm Since you are free, help me carry this box 模拟训练 1. _____ we are now in the old town, why not taste the local food here? A．Though B．Since C．Before D．Unless 2．________ everyone is here, let’s start our English lesson. Now turn to Page 22. A．Before B．Whether C．Unless D．Since 3．We decided to stay indoors and play games ___________ it was raining. A．unless B．although C．since D．so 4．—Did you call Fred back? —I didn’t need to, ________ I’ll see him tomorrow. A．because B．if C．when D．as soon as 实战练习 5. We should be kind to animals ________ they are our friends. A．so B．because C．but D．or 6. We should save water ________ it’s precious. A．so B．because C．but D．or 7. Perhaps you should ask someone else for help ________ you can’t solve the problem. A．so B．since C．unless 8. — The road up to the top of the mountain is still closed till the snow weather is over. — It’s necessary, ________ it’s dangerous to go up the mountain in the snowy weather. A．if B．whether C．as D．although 9. I don’t want to go hiking not ________ the weather, but ________ I am tired. A. because; because of B. because; because C. because of; because 10. I often listen to Chopin after school ________ his piano pieces sound relaxing. A．because B．but C．or D．so 11. —Why do you like geography? — ________ it’s interesting. A．So B．Because C．But D．And 12. The students must have had a great party in the classroom, ________ there are some pieces of cake and colorful balloons on the desks. A. but B. so C. because D. for $