Unit 1 语法讲解及习题：if与because引导的状语从句 2026-2027学年外研版英语九年级上册

该初中英语单元语法清单系统梳理了外研版九上Unit1“if与because引导的状语从句”核心内容，涵盖because原因状语从句（含核心含义、基础结构、时态规则及关键注意点）和if条件状语从句（含核心含义、主将从现规则及拓展细节）两大知识范畴，为学生搭建了从“基础概念理解”到“时态规则应用”再到“两种从句对比辨析”的递进式学习支架。 清单采用“对比总结表”和“分题型专项练习”构建知识体系，如表格对比两种从句的功能、时态及句式标志，培养思维品质。设计“考试高频考点标注”（如if从句“主将从现”）和“错题逐题解析”（如because与so不可连用修正），助力突破重难点提升语言能力，教师可用于课堂讲解或分层练习，学生能自主查漏补缺，高效提升语法应用能力。

外研版英语九上Unit1语法讲解及习题: if与because引导的状语从句(状语从句1) 一、单元语法总览 本单元核心语法为if 引导的条件状语从句、because 引导的原因状语从句,同属 Adverbial clauses (1) 第一类状语从句,是九年级上册首个语法重点,用于描述青少年品质、传统艺术保护、青少年行为等单元话题。 二、语法细分精讲 (一)because 引导原因状语从句 1. 核心含义 用来解释动作 / 事件发生的原因,翻译为 “因为”,从句表原因,主句表结果。 2. 基础结构 主句 + because + 原因从句 Because + 原因从句,主句(从句放句首时,逗号分隔主从句) 3. 时态规则 主从句时态保持一致: • 一般现在时:表客观事实、常态 He loves shadow puppets because they are traditional Chinese art. 他喜爱皮影戏,因为它们是中国传统艺术。 • 一般过去时:表过去发生的事(贴合单元皮影阅读文本) She didn’t like puppets before because she thought they were old-fashioned. 她从前不喜欢木偶,因为她觉得它们过时了。 4. 关键注意点 (1)不能与 so 连用:because 表原因,so 表结果,二者二选一,不可同句出现 错误:Because many folk arts are dying, so we need to protect them. 正确:Many folk arts are dying, so we need to protect them. 正确:We need to protect folk arts because many of them are dying. (2)回答 why 引导的特殊疑问句,必须用 because —Why do teenagers join folk art clubs? —They join them because they want to pass on traditional culture. (二)if 引导条件状语从句(主将从现) 1. 核心含义 表假设条件,翻译为 “如果”,满足从句条件,就会产生主句结果。 2. 核心时态规则:主将从现(考试最高频考点) • if 从句(条件):一般现在时 • 主句(结果):一般将来时(will do) 结构 1:If + 一般现在时从句,主语 + will + 动词原形,……(从句放句首加逗号) 结构 2:主语 + will + 动词原形 if + 一般现在时从句(从句后置无逗号) 3. 单元话题例句 (1)If teenagers learn shadow puppetry, they will help this art live on. 如果青少年学习皮影戏,他们会让这项艺术延续下去。 (2)We will lose many folk arts if we don’t take action now. 如果我们现在不行动,我们会失去很多民间艺术。 4. 拓展细节 (1)从句主语为三单,动词要变三单形式 If he gives puppet shows at school, more students will know this art. (2)否定形式:if + 主语 + don’t/doesn’t + 动词原形 If she doesn’t join the art club, she won’t learn paper-cutting. (3)区分 if 两种含义: ￮ 条件状语从句:if = 如果,遵循主将从现 ￮ 宾语从句:if = 是否,时态随主句变化(本单元不涉及,仅区分认知) (三)两种从句对比总结表 引导词 功能 时态核心 句式标志 because 说明原因 时态同步,无特殊规则 回答 why,不能搭配 so if 假设条件 主将从现 满足条件 将来结果 三、专项练习题 (一)题型一:用 if /because 填空 1. We should protect paper-cutting _many old skills are disappearing. 2. _young people take up puppetry, the old art won’t die out. 3. Teenagers show puppet plays at school _they hope more classmates love folk arts. 4. You will know traditional culture better _you visit the folk art museum. 5. I didn’t watch the puppet show last week _I was busy with my homework. 6. _we don’t learn these arts, we will lose our cultural treasure. 7. Many students join the art club _they think it’s meaningful. 8. Your puppet will move beautifully _you control your fingers well. 9. She feels proud of shadow puppets _it is a great Chinese folk art. 10. _you practice every week, you will make wonderful paper-cuts. (二)题型二:句型转换(按要求改写句子 ) 1. He loves traditional arts. They carry Chinese history.(用 because 合并) 2. You give shows at school. More students will know puppetry.(用 if 合并) 3. Many folk arts are in danger. We need to protect them.(二选一改写,分别用 because/so 写两句) 句 1(because): 句 2(so): 4. If you learn paper-cutting, you will understand Chinese culture.(改为同义句,从句后置) 5. She didn’t join the art club. She disliked old crafts.(用 because 合并,从句前置) 6. We will lose folk arts. We don’t take action.(用 if 合并成否定条件句) 7. Why do you learn shadow puppets?(用 because 回答:我学习它是因为我想传承传统艺术) 8. If he practices puppetry every day, he will become good at it.(改为一般过去时条件句,主句 would) (三)题型三:单项选择 1. —Why do teenagers protect folk arts? —_ they are valuable cultural treasure. A. If B. Because C. So D. When 2. If you _ your puppet fingers well, the puppet _ look lively. A. control; will B. will control; does C. control; does D. will control; will 3. We can’t give up folk arts, _ many of them are disappearing now. A. if B. so C. because D. but 4. _ you don’t visit the folk museum, you _ know little about paper-cutting. A. If; will B. If; won’t C. Because; will D. Because; won’t 5. Because young people love traditional crafts, _ they learn puppetry at school. A. so B. / C. but D. and 6. She missed the puppet show yesterday _ she had a piano lesson. A. if B. because C. when D. though 7. Teenagers _ spread folk arts if they _ more school shows. A. help; hold B. will help; hold C. help; will hold D. will help; will hold 8. —Will the old art survive? —Yes, _ more teenagers take it up. A. because B. if C. though D. unless 9. I respect young folk artists _ they try their best to save old arts. A. if B. so C. because D. when 10. If he _ time, he _ watch the shadow puppet performance. A. has; will B. will have; will C. has; does D. will have; does (四)题型四:改错(划出错误并改正 ) 1. Because many folk arts are dying, so we teenagers should protect them. 2. If he will join the art club, he learns paper-cutting soon. 3. I love shadow puppets because of they carry our old stories. 4. If we don’t take action, we lost lots of traditional arts one day. 5. He didn’t go to the museum because he is busy last Saturday. 四、习题答案 + 逐题解析 (一)题型一:if /because 填空 答案 + 解析 1. because 解析:后半句解释 “保护剪纸” 的原因,表原因用 because 2. If 解析:“年轻人学习木偶戏” 是假设条件,表 “如果” 放句首大写 If 3. because 解析:后半句说明在校表演木偶戏的目的 / 原因 4. if 解析:“参观民间艺术馆” 是 “更懂传统文化” 的条件 5. because 解析:上周没看演出的原因是作业多,表原因 6. If 解析:假设条件 “我们不学这些艺术”,主句产生不好的结果,句首大写 7. because 解析:学生加入社团的原因是觉得有意义 8. if 解析:“控制好手指” 是木偶优美动起来的条件 9. because 解析:为皮影骄傲的原因是它是优秀中国民间艺术 10. If 解析:每周练习是剪出精美剪纸的条件,句首大写 (二)题型二:句型转换 答案 + 解析 1. He loves traditional arts because they carry Chinese history. 解析:主句在前,because 连接原因从句,时态保持一般现在时 2. If you give shows at school, more students will know puppetry. 解析:if 从句放句首,一般现在时 give,主句将来时 will know,逗号分隔 3. 句 1:We need to protect them because many folk arts are in danger. 句 2:Many folk arts are in danger, so we need to protect them. 解析:because 表原因;so 表结果,二者不能同句使用 4. You will understand Chinese culture better if you learn paper-cutting. 解析:if 从句后置,无需逗号,时态不变 5. Because she disliked old crafts, she didn’t join the art club. 解析:because 从句前置,过去时态统一,逗号分隔主从句 6. We will lose folk arts if we don’t take action. 解析:if 引导否定条件,从句 don’t + 动词原形,主句将来时 7. I learn it because I want to pass on traditional art. 解析:why 提问必须用 because 回答,贴合单元青少年传承传统艺术话题 8. If he practiced puppetry every day, he would become good at it. 解析:虚拟过去条件,从句一般过去时 practiced,主句 would + 动词原形 (三)题型三:单项选择 答案 + 解析 1. B 解析:why 提问,用 because 回答原因 2. A 解析:主将从现,if 从句一般现在时 control,主句 will + 动词原形 3. C 解析:后半句解释不能放弃民间艺术的原因,because 表原因 4. B 解析:if 引导否定条件 “如果你不去博物馆”,主句 “你就不会了解剪纸”,won’t 表否定将来 5. B 解析:because 和 so 不能连用,中间不填连词 6. B 解析:昨天错过演出的原因是有钢琴课,because 表原因 7. B 解析:主将从现,从句 hold 一般现在时,主句 will help 将来时 8. B 解析:if 表 “如果更多青少年学习它,这项古老艺术就能留存”,表假设条件 9. C 解析:我尊敬年轻民间艺人,原因是他们尽力拯救古老艺术,because 10. A 解析:主将从现,从句 has 三单一般现在时,主句 will watch (四)题型四:改错 答案 + 解析 1. 错误:so 删除 so 解析:because 和 so 不能同时出现在一个句子中,二者保留其一 2. 错误:will join joins;learns will learn 解析:if 条件句主将从现,从句用一般现在时 joins,主句将来时 will learn 3. 错误:because of because 解析:because of 后接名词 / 短语;because 后接完整句子,本句是从句,用 because 4. 错误:lost will lose 解析:if 条件句,主句描述将来的后果,用一般将来时 will lose 5. 错误:is was 解析:主句 didn’t 为一般过去时,because 从句时态同步用 was,last Saturday 是过去时间标志 ( 1 ) 学科网(北京)股份有限公司 $