Unit 1 Teenagers today 语法+写作知识暑假预习 2026-2027学年外研版英语九年级上册

外研版九年级上册 Unit 1 Teenagers today语法+写作知识暑假预习 01 预习航标→ 析目标·明方向 关键词 学习目标导航 语法目标 1. 熟练掌握原因状语从句的引导词（because/since/as/for）辨析及语序规则 2. 掌握真实条件状语从句的引导词（if/unless/as long as）用法，吃透“主将从现”核心规则 3. 能准确区分if引导的宾语从句和条件状语从句 写作目标 1. 能围绕“青少年成长”主题撰写发言稿、建议信、成长叙事类短文 2. 能在写作中准确运用原因/条件状语从句，逻辑清晰、表达地道 3. 能结合单元主题展现当代中国青少年的责任意识与精神风貌 学习重点 单元写作核心：“人生万事需自为，跬步江山即寥廓”。作为新时代青少年，追求进步是最宝贵的特质，学会用英语表达“自我提升、责任担当、人际沟通”的成长感悟，是中考写作高频考查方向。 02 教材全解→ 析教材·学新知 考点一 原因状语从句 知识梳理 原因状语从句用于说明动作发生的理由，常见引导词及用法辨析如下： 引导词 语气 位置 核心用法 because​ 最强 多放在主句后（可直接回答why问句） 强调动作发生的直接、核心原因，是唯一能回答why的引导词 since/as​ 较弱 可放句首/主句前 说明已知的事实、背景信息，since比as语气稍强，更正式 for​ 最弱 必须放句末，用逗号与主句隔开 补充说明原因，是逻辑推理后的附加信息，不放句首 now that​ 较弱 多放句首 意为“既然”，强调双方都知道的前提条件 ✅ 例句参考： 1. —Why were you absent yesterday? —Because I had a high fever.（回答why，用because） 2. Since you have finished your homework, you can play basketball for half an hour.（已知事实，since放句首） 3. As it was raining heavily, we canceled the outdoor activity.（已知原因，as放句首） 4. We can’t go hiking, for the weather forecast says it will rain tomorrow.（补充说明，for放句末） 例题精析 【例题】_______ the subway is convenient and environmentally friendly, more and more people choose to go to work by it. A. Because B. Since C. For D. As 【解析】句意：既然地铁便捷又环保，越来越多人选择乘地铁上班。空处引导原因状语从句，且“地铁便捷环保”是双方都知道的背景信息，since可放句首，符合语境。because侧重直接原因，for放句末，as语气弱于since，故选B。 【考点延伸】若题目改为“—Why do many people choose the subway? —_______ it’s convenient and green.”，则只能选A（because回答why问句）。 即练固基（原因状语从句） 1. —_______ didn’t you come to the English club yesterday? —Because I had a cold. A. When B. Why C. How D. Where 2. _______ all the food in the fridge has gone bad, we need to go shopping this afternoon. A. Because B. Since C. For D. As 3. He failed the math exam _______ he didn’t review the key points carefully. A. because B. since C. for D. as 4. The streets are wet, _______ it rained heavily last night. A. because B. since C. for D. as 5. _______ everyone is ready for the group project, let’s divide the tasks now. A. Because B. Since C. For D. As 考点二 条件状语从句 知识梳理 条件状语从句用于说明动作发生的前提条件，初中阶段仅考查真实条件句（假设有可能实现的情况），核心规则如下： 1. 引导词：if（如果）、unless（除非=if not）、as/so long as（只要） 2. 时态规则（主将从现）：主句用一般将来时/祈使句/含情态动词的句子，从句用一般现在时表将来。 3. 同义转换：祈使句 + and/or + 简单句 ↔ 条件状语从句 • Hurry up, or you’ll miss the early bus. = If you don’t hurry up, you’ll miss the early bus. • Work harder, and you’ll catch up with your classmates. = If you work harder, you’ll catch up with your classmates. 4. 易混辨析：if引导宾语从句vs条件状语从句 类型 含义 时态规则 宾语从句 “是否”，作动词宾语 根据语境选择时态，不受主将从现限制 条件状语从句 “如果”，作状语 遵循主将从现 ✅ 例句对比： • I don’t know if it will rain tomorrow.（宾语从句：是否，用一般将来时） • If it rains tomorrow, we will stay at home.（条件状语从句：如果，主将从现） 例题精析 【例题】If you _______ harder next term, you will make great progress in English. A. study B. studied C. will study D. are studying 【解析】句意：如果你下学期更努力学习，你的英语会取得很大进步。if引导条件状语从句，遵循主将从现规则，从句用一般现在时study，主句用一般将来时will make，故选A。 【易错警示】不可受中文“将更努力”影响错选C，条件状语从句中不可用将来时表将来。 即练固基（条件状语从句） 1. Unless you _______ your teeth twice a day, you will have toothaches easily. A. brush B. brushed C. will brush D. are brushing 2. You will fail the PE exam _______ you practice running every morning. A. if B. unless C. as long as D. since 3. _______ you keep reading English aloud every day, your pronunciation will improve quickly. A. As long as B. Unless C. Because D. For 4. —Do you know if Tom _______ to the park with us this weekend? —I think he will if he _______ free. A. comes; is B. will come; is C. comes; will be D. will come; will be 5. Be kind to others, _______ you will make more friends. A. and B. or C. but D. so 考点三 写作精讲 单元写作主题定位 外研版Unit 1核心话题为“Teenagers today”，写作常考三类文体：成长主题发言稿、问题解决建议信、成长经历记叙文，核心要求是用英语表达青少年的自我提升、责任担当、人际沟通等感悟，可自然融入原因/条件状语从句。 写作模板（发言稿为例） ✅ 开头（点题）：问候+自我介绍+发言主题 Good morning, everyone! I’m Li Hua. It’s my great honor to speak here today. My topic is “Small Changes, Big Growth”. ✅ 主体（叙事+说理）：结合自身事例，用原因/条件状语从句说明改变的过程和意义 I used to be weak in spoken English. Since I joined the English corner every Friday afternoon, I have made great progress. As long as we keep practicing, we can overcome any difficulty in learning. ✅ 结尾（升华+呼吁）：总结感悟，发出倡议 Let’s take small steps every day! Only by improving ourselves can we become better teenagers. Thank you! 写作素材库 类别 可用词汇/句型 核心词汇 teenager, challenge, responsibility, persevere, make progress, self-disciplined, social practice, volunteer, achieve one’s dream 亮点句型 1. It is + adj + for sb to do sth. 2. Only by doing sth can we... 3. As long as..., we will... 4. ..., because/since/as... 即练固基（写作微练） 1. 翻译句子：只要你坚持每天阅读，你的写作水平就会提高。 2. 翻译句子：因为我参加了社区志愿服务，我学会了如何和不同的人相处。 3. 补全句子：_______（既然你已经长大了）, you should learn to take care of yourself. 03 过关检测→ 练考点·强落实 一、基础过关（单项选择，每题1分，共15分） 1. —Why are you looking so happy? —_______ I got full marks in the English exam. A. Since B. Because C. For D. As 2. You will miss the school bus _______ you get up 10 minutes earlier tomorrow. A. if B. unless C. as long as D. since 3. _______ the air pollution in our city is getting worse, the government has made strict rules to control it. A. Because B. Since C. For D. As 4. If it _______ sunny this weekend, we will go climbing in the countryside. A. is B. will be C. was D. has been 5. _______ you finish your homework before dinner, you can play video games for 20 minutes. A. As long as B. Unless C. Because D. For 6. He didn’t go to the cinema with us yesterday _______ he had to prepare for the speech contest. A. because B. since C. for D. as 7. Read the instructions carefully, _______ you will make mistakes when using the machine. A. and B. or C. but D. so 8. Since everyone is here, let’s _______ the class meeting now. A. start B. started C. will start D. have started 9. Unless you _______ the teacher’s advice, you won’t improve your listening skills quickly. A. take B. took C. will take D. are taking 10. I don’t know if it _______ tomorrow. If it _______, we will cancel the outdoor picnic. A. rains; rains B. will rain; will rain C. will rain; rains D. rains; will rain 11. _______ many students think volunteering is tiring, they still take an active part in it. A. Because B.Although C. For D. As 12. As long as you _______ hard, your dream of becoming a pilot will come true one day. A. will work B. work C. worked D. are working 13. The flowers in the garden are blooming, _______ spring has arrived. A. because B. since C. for D. as 14. —Can I borrow your dictionary? —Sure, _______ you return it to me next Monday. A. as long as B. unless C. because D. for 15. If we _______ litter on the ground, we will make the campus more beautiful. A. don’t throw B. didn’t throw C. won’t throw D. threw 二、语篇巩固（语法填空，每空1分，共10分） 短文1（主题：青少年社区志愿服务） 阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。 As teenagers, we should take responsibility for our community. Last month, our school launched a “Warm Winter” activity to collect old coats for children in mountain areas. ___1___ many students thought it was tiring, we still took an active part in it. Since we work together, we can make a big difference. I used to be lazy, but since I ___2___ (join) this activity, I have learned the importance of helping others. If everyone ___3___ (give) a little love, the world ___4___ (become) a better place. We will continue the activity unless it ___5___ (stop) by the school. So far, we ___6___ (collect) over 300 coats. I am proud of what we have done, because it not only helps others but also improves my organizational skills. 短文2（主题：校园读书节） 阅读下面短文，在空白处填入1个适当的单词或括号内单词的正确形式。 Our school held a Reading Festival last week. ___1___ reading is good for our growth, all the students were encouraged to take part in it. I used to dislike reading, but since my teacher ___2___ (give) me some interesting books, I have fallen in love with it. As long as you ___3___ (read) every day, you will improve your language skills. During the festival, if you ___4___ (find) a book you like, you can borrow it from the library for free. I read three books last week, and I have made great progress in writing. ___5___ I have a lot of homework to do, I will still spend half an hour reading every day. Reading makes me happy, for it opens up a new world to me. 三、写作训练（共3题，每题15分，共45分） 1. 主题发言稿 学校正在举办“Teenagers’ Growth”主题演讲比赛，请你以“Small Changes, Big Differences”为题写一篇发言稿，分享你通过改变一个小习惯（比如坚持晨跑、每天阅读、帮父母做家务）获得的成长。 要求：① 80-100词；② 用上至少1个原因状语从句和1个条件状语从句；③ 不得出现真实姓名和校名。 2. 建议信 你的笔友Mike最近很苦恼：他沉迷手机游戏，成绩下降，还经常和父母吵架。请你给他写一封回信，给出你的建议。 要求：① 80-100词；② 用上至少1个原因状语从句和1个条件状语从句；③ 不得出现真实姓名和校名。 3. 主题征文 校刊正在举办“My Powerful Teenage Moment”主题征文，请你写一篇短文，讲述你曾经克服一个困难（比如学骑自行车、第一次上台演讲、帮助他人）的经历，以及从中得到的感悟。 要求：① 80-100词；② 用上至少1个原因状语从句和1个条件状语从句；③ 不得出现真实姓名和校名。 参考答案及详细解析 一、基础过关答案 1. B（回答why问句，用because） 2. B（句意：除非你明天早起10分钟，否则你会错过校车。unless=if not） 3. B（句意：由于我们城市的空气污染越来越严重，政府出台了严格的管控规定。since放句首，说明已知背景） 4. A（if引导条件状语从句，主将从现，从句用一般现在时is） 5. A（句意：只要你晚饭前完成作业，你可以玩20分钟电子游戏。as long as引导条件状语从句） 6. A（句意：他昨天没和我们去看电影，因为他要准备演讲比赛。because强调直接原因） 7. B（句意：仔细阅读说明书，否则你操作机器时会出错。祈使句+or+简单句，表“否则”） 8. A（let’s后接动词原形，固定搭配） 9. A（unless引导条件状语从句，主将从现，从句用一般现在时take） 10. C（第一个if引导宾语从句，意为“是否”，根据tomorrow用一般将来时will rain；第二个if引导条件状语从句，主将从现，用一般现在时rains） 11. B（句意：尽管很多学生觉得志愿服务很累，他们仍然积极参与。although引导让步状语从句，意为“尽管”，符合语境） 12. B（as long as引导条件状语从句，主将从现，从句用一般现在时work） 13. C（句意：花园里的花开了，因为春天到了。for放句末，补充说明原因） 14. A（句意：当然可以，只要你下周一还给我。as long as引导条件状语从句，意为“只要”） 15. A（if引导条件状语从句，主将从现，从句用一般现在时don’t throw） 二、语篇巩固答案 短文1 1. Although/Though（句意：尽管很多学生觉得累，我们仍然积极参与。引导让步状语从句） 2. joined（since引导时间状语从句，主句用现在完成时，从句用一般过去时joined） 3. gives（if引导条件状语从句，主将从现，从句用一般现在时gives） 4. will become（主句用一般将来时，表将来的结果） 5. is stopped（it指代activity，和stop是被动关系，unless引导条件状语从句，用一般现在时的被动语态is stopped） 6. have collected（so far是现在完成时标志，用have collected） 短文2 1. Since/As（句意：由于阅读对我们的成长有好处，所有学生都被鼓励参与其中。since/as放句首，说明原因） 2. gave（since引导时间状语从句，主句用现在完成时，从句用一般过去时gave） 3. read（as long as引导条件状语从句，主将从现，从句用一般现在时read） 4. find（if引导条件状语从句，主将从现，从句用一般现在时find） 5. Although/Though（句意：尽管我有很多作业要做，我仍然会花半小时阅读。引导让步状语从句） 三、写作训练参考范文 1. 发言稿参考范文 Small Changes, Big Differences Good morning, everyone! I’m Li Hua. It’s my honor to speak here today. My topic is “Small Changes, Big Differences”. I used to be weak in running. Since I decided to jog for 20 minutes every morning, I have become much healthier. As long as we keep doing small good things, we can make a big difference. Running not only builds up my body but also teaches me to persevere. Because of this small change, I have more energy to study now. Let’s start with small changes! Thank you! ✅ 得分点：用到since（原因）、as long as（条件）、because of（原因）三个状语从句相关表达，内容完整，逻辑清晰。 2. 建议信参考范文 Dear Mike, I’m sorry to hear about your problems. Since playing games too much wastes your time, you should limit your screen time first. As long as you spend more time on study, your grades will improve soon. You often argue with your parents because they worry about your health and study. Why not talk to them calmly? If you share your feelings with them, they will understand you better. I hope my advice helps. Looking forward to your good news. Yours, Li Hua ✅ 得分点：用到since（原因）、as long as（条件）、because（原因）、if（条件）四个状语从句，建议合理，符合语境。 3. 征文参考范文 My Powerful Teenage Moment Last term, I was afraid of speaking in public. Since my teacher encouraged me to join the English speech contest, I practiced every day. I used to want to give up because the script was difficult. But as long as I kept trying, I finally made it. I got the second prize! Because of this experience, I learned that courage is the key to overcoming difficulties. This powerful moment changed me a lot. I’m not shy anymore. ✅ 得分点：用到since（原因）、because（原因）、as long as（条件）三个状语从句，叙事完整，感悟深刻。 学科网（北京）股份有限公司 $