Unit 1 Teenagers today Understanding ideas (Grammar)（课件）2026-2027学年外研版九年级英语上册

该初中英语课件聚焦if条件状语从句（含主将从现等规则）和because原因状语从句（含与because of等辨析），通过视频提问导入引发兴趣，结合阅读原文例句归纳语法规则，再以连接句子、完成通知等活动搭建从理解到运用的学习支架。 其亮点在于融合文化意识（民间非遗保护情境，如中国结传承故事）与思维品质（区分条件与因果逻辑），通过责任主题故事写作提升语言能力。采用例句分析、活动实践（如连词成句）和语法结构梳理的教学方法，帮助学生迁移语言知识，教师可直接使用系统资源提升教学效率。

Understanding ideas (Grammar) Teenagers today PART. 01 Learning Objectives 思维品质 学习能力 文化意识 语言能力 教学目标 掌握if引导条件状语从句、because引导原因状语从句的语法规则，能借助参考表达完成承担责任主题的英文故事写作与口头讲述。 结合民间非遗保护的语境，体会青年传承传统文化的责任担当，增强保护本土民俗艺术的文化自觉，理解公益传承行为的社会文化价值。 掌握从原文定位同类语法例句的阅读策略，学会借助提示提纲和功能表达完成叙事创作，提升自主归纳语法规律、迁移运用语言知识的能力。 学会区分条件逻辑与因果逻辑，提升逻辑推理、句式重构的能力；能按时间、地点、事件发展的线索搭建叙事框架，有条理地梳理个人责任故事。 教学重难点 理清if条件状语从句、because原因状语从句的用法区别。 能依据提纲和参考短语，写出结构完整、逻辑通顺的责任主题个人故事。 在写作和口语表达中精准选用if/because体现逻辑关系，自然复用文本里的特色表达。把个人经历和文化传承、责任担当的主题结合，叙事细节充实、情感表达贴合主题，逻辑连贯自然。 01 02 PART. 02 Lead-in What does “if” mean in the video? PART. 03 Grammar Activity 5 Read the sentences from the reading passage and summarise the grammar rules. (a) If I move my fingers, it will come to life! (b) I felt less close to the art because people thought puppets were old-fashioned. if 引导的条件状语从句，if 表示条件（如果） because 引导的原因状语从句，because 表示原因（因为） if引导的条件状语从句 一、基础定义 if 意为如果，引导真实条件状语从句，从句提出一个可能发生的条件，主句说明这个条件达成后会产生的结果。 ⚠ 区分易混点：if 有两种身份 条件状语从句：if = 如果，遵循「主将从现」； 宾语从句：if = 是否，时态无固定规则。 If you practice every day, you will make great progress.（条件从句：如果） I don’t know if he will come to my birthday party.（宾语从句：是否） 二、黄金核心规则：主将从现 if 引导的条件从句：时态只用一般现在时（do/does/am/is/are） 主句：描述未来结果，用一般将来时（will + 动词原形） If he comes, we will have a party. 如果他来了，我们就开个派对。 If you don’t hurry, you will miss the bus. 如果你不快点，就会错过公交车。 三、标准语序 语序 1：主句在前，if 从句在后，无逗号 You will get good grades if you listen to teachers carefully in class. 如果你上课认真听老师讲课，你会取得好成绩。 语序 2：if 从句放句首，主句在后，中间必须加逗号 If we plant more trees, our city will become more beautiful. 如果我们种更多树，我们的城市会变得更漂亮。 四、主句三类变形 变形 1：主句使用情态动词 can /may/must /should If you feel tired, you can stop to have a short rest. 如果你感到疲惫，可以停下来短暂休息。 变形 2：主句为祈使句（表建议、命令、号召） If you meet new words, look them up in the dictionary. 如果你遇到生词，就去查字典。 变形 3：主句使用 have to If you want to visit the museum, you have to take your ID card. 如果你想去参观博物馆，必须带上身份证。 注意：①unless意为“除非，如果不”，相当于if...not，引导条件状语从句时通常可以互换。 Mary will be late unless she sets off now. = Mary will be late if she doesn’t set off now. 除非玛丽现在出发，否则她会迟到。 ②含有if引导的条件状语从句的主从复合句有时可以转换成“祈使句+and/or+陈述句”结构，and表示“那么，就”，or表示“否则，不然”。 If you study hard, you will get good grades. = Study hard, and you will get good grades. 努力学习，你就会取得好成绩。 If you get up early, you will catch the first bus. = Get up early, and you will catch the first bus. 早点起床，你就能赶上首班车。 If you don’t hurry up, you will miss the movie. = Hurry up, or you will miss the movie. 快点，不然你会错过电影。 If you don’t wear warm clothes, you will catch a cold. = Wear warm clothes, or you will catch a cold. 穿暖和点，否则你会感冒。 because引导的原因状语从句 一、基础定义 because 意为因为，引导原因状语从句，用来交代主句动作、情绪、状态产生的根源，专门回答以 Why 开头的问句。 二、标准语序 语序 1：主句在前，because 从句在后（日常最常用，无需逗号分隔） I walk to school every day because my home is near the school. 我每天步行上学，因为我家离学校很近。 语序 2：Because 从句置于句首，主句在后（从句末尾必须加逗号） Because it rained heavily yesterday, we put off the sports meeting. 因为昨天雨下得很大，我们推迟了运动会。 三、辨析because、since、as与for 连词 含义 用法 用法特点 because 因为 语气很强，表示直接原因还可用来回答why引导的特殊疑问句 引导的从句既可置于主句之前，也可置于主句之后。如果从句在前，从句与主句之间要用逗号隔开 since 因为，由于 比 because 正式，语气比because弱，一般不用于回答why引导的问题，可用于正式或文学性的书面语中 引导的从句位于主句之后;其前常用逗号与主句隔开 as 既然，因为，由于 语气较弱，表示显然的或已知的理由，较正式 引导的从句多位于主句之前 for 因为，由于 与since的用法大体相同，表示附带说明的“双方已知的原因” 引导的从句通常位于主句之前，也可位于主句之后 四、注意事项 1. because与because of 的区别 because + 完整句子（主语 + 谓语）；because of + 名词 / 代词 / V-ing He stayed at home because the rain fell heavily. 他待在家里，因为雨下得很大。 He stayed at home because of the heavy rain. 他待在家里，因为这场大雨。 判断方法：看空格后面是句子还是名词/短语。句子用 because，名词/短语用 because of。 2. because 不与 so 连用 英语中because 和 so 不能同时出现在一个句子里。 Because I was sick, so I didn’t go to school. (错误：because 和 so 同时使用) Because I was sick, I didn’t go to school. (正确：保留 because) I was sick, so I didn’t go to school. (正确：保留 so) Activity 5 Now find more sentences with these structures in the reading passage. Activity 6 Connect the sentences with if or because. 1. More young people got to know this art. Zhan Haojing gave puppet shows at school. ______________________________________________________________________________________________________________________________________________ 2. Wang Meng joins the traditional art club. She will learn how to protect traditional art. ______________________________________________________________________________________________________________________________________________ More young people got to know this art because Zhan Haojing gave puppet shows at school. If Wang Meng joins the traditional art club, she will learn how to protect traditional art. Analyse the structure. 目的 Opening 开篇：点明活动目的与发起项目的缘由：民间艺术濒临消失 Body 主体：安排具体活动 + 解释活动意义 Closing 结尾：发出号召，点明责任 Activity 7 Complete the notice with if or because. Dear friends, We want to start a programme to protect our local folk arts 1________ many of them are in danger now. Some of these arts may soon disappear 2________ we don’t take action. This week, let’s visit the folk art museum 3________ it’s the best place for us to learn about these arts. 4________ we don’t know them well, it will be difficult to know how to help. Then, we can work as volunteers at the museum. We can help more people understand the arts and join in to protect them. Come and work with us. It's our responsibility! Join us to protect folk arts because because if if Choose the best answer. 1. If it ______ tomorrow, we will go to the park. A. rain B. rains C. will rain D. rained 2. I didn’t go to school ______ I had a fever. A. so B. because C. because of D. if 3. ______ you work harder, you will pass the exam. A. If B. Because C. So D. Unless 4. We will stay at home if it ______ sunny tomorrow. A. isn’t B. won’t be C. doesn’t D. isn’t going to Useful expressions ... expressed their love for... ...encouraged me to... ... will... if young people... ·I believe... It was my responsibility to... Activity 8 Introduce your own story about taking responsibility. Use the words and expressions from the reading passage and the Useful expressions to help you. ... expressed their love for... ... will... if young people... ...encouraged me to... I believe... It was my responsibility to... Useful expressions Useful expressions ... expressed their love for... ...encouraged me to... ... will... if young people... ·I believe... It was my responsibility to... Sample Last month, our school held a cultural festival. My grandma taught me how to make Chinese knots when I was little, so I decided to share this skill with my classmates. I prepared red threads and tools, and I showed everyone how to tie basic knots like the lucky knot. At first, I was a bit nervous. But when my classmates followed my steps and made their first knots, I felt excited. By the end of the festival, over 20 classmates had learned to make simple Chinese knots. Then and there, I realised that it was my responsibility to pass down this traditional culture. I believe that if young people are interested in it, more people will know how to make Chinese knots and keep the art alive. PART. 04 Language Points 1. We want to start a programme to protect our local folk arts... 我们想启动一个保护本地民间艺术的计划…… programme ① (电视、广播等)节目 ② 课程 My grandma likes watching educational TV programmes every evening. 我奶奶每晚都爱看教育类电视节目。 She joined a summer study programme in Beijing last year. 去年她参加了北京的暑期研学课程。 2. Then, we can work as volunteers at the museum. 之后，我们可以在博物馆做志愿者。 volunteer n. 志愿者，义务工作者 → voluntary adj. 自愿的；志愿的 Many young volunteers help clean the park on weekends. 许多青年志愿者周末帮忙打扫公园。 This is a voluntary activity, no one is forced to join it. 这是一项志愿活动，没有人被强迫参加。 volunteer as... 自愿充当…… He volunteered as a guide for the city museum. 他自愿担任城市博物馆的讲解员。 volunteer to do sth. 自愿做某事；义务做某事 Lots of students volunteer to give out food to homeless people. 很多学生自愿给无家可归的人分发食物。 3. Colourful Folk Arts Group多彩民间艺术小组 a group of... 一组/群/批…… (其后常跟可数名词复数) A group of students are planting trees by the river. 一群学生正在河边植树。 I saw a group of lovely birds fly across the sky. 我看见一群可爱的小鸟飞过天空。 in groups 成群地；分组 The teacher asks us to discuss the questions in groups. 老师让我们分组讨论这些问题。 PART. 05 Exercises Exercise—连词成句 1. if, work, hard, you, will, achieve, goal, your, you (.) ____________________________________________________________________________ 2. healthy, it, swimming, keeps, like, I, me, because (.) ____________________________________________________________________________ 3. can, tell, anything, he, keep, secrets, I, can, because, him (.) ____________________________________________________________________________ 4. you, dangerous, in winter, be, if, are, driving, can, not careful (.) ____________________________________________________________________________ 5. a book lover, or choose e-books, you can, if, second-hand books, you are, buy (.) ____________________________________________________________________________ If you work hard, you will achieve your goal. I can tell him anything because he can keep secrets. Driving in winter can be dangerous if you are not careful. If you are a book lover, you can buy second-hand books or choose e-books. I like swimming because it keeps me healthy. Exercise—完成句子 1. 如果我们互相合作，所有的努力最终都会有回报。 If we __________ _______ ______ ______, all the hard work ______ _______ ______ ______ _______ _______. 2. 如果每个人献出一点爱，世界将变得更美好。 ________ everyone ________ a little love, the world ________ ________ a better place. 3. 许多人喜欢它，因为它展现了 16 世纪意大利的生活风貌。 Many people enjoy it ________ it shows what life ________ ________ in 16th-century Italy. 4. 我认为轮子是最重要的发明，因为它改变了世界各地的交通。 I think the wheel is the most important invention _________ ______ ______ __________ _______________ around the world. cooperate with each other If gives will become because was like because it has changed transportation will pay off in the end PART. 06 Summary Grammar if引导的条件状语从句 标准语序 辨析because、since、as与for 基础定义 because引导的原因状语从句 注意事项 标准语序 黄金核心规则：主将从现 基础定义 主句三类变形 注意事项 PART. 07 Homework Homework Summarize basic words and sentences. Make a dialogue by using basic words and sentences. See you next class! Lavf61.7.100 Packed by Bilibili XCoder v2.0.2 $