Unit1语法专项课件 if&because状语从句 2026-2027学年外研版九年级英语上册

该初中英语课件聚焦九年级上册Unit1 if&because状语从句语法专项，系统梳理because原因状语从句（含时态统一、与so及because of的区分）和if条件状语从句（含“主将从现”规则、三单变形及否定用法），通过对比表格、核心知识点复盘等工具，将两类从句的用法、时态规则及易混点串联，帮助学生构建清晰的语法知识网络。 其亮点在于以“规则讲解-易错诊断-分层训练”为主线，如通过“because与so叠加使用”“主将从现时态颠倒”等易错点分析培养学生的思维品质，设计“句型合并改写”“句子改错”等练习提升语言运用能力。分层题型覆盖基础到综合，助力个性化复习，既帮助学生巩固语法规则，也为教师提供精准复习教学的抓手。

教学课件 外研英语九年级上册 Unit1 语法专项 —— if&because状语从句 全解精讲+分层练习 1 1.分清 because 原因状语从句、if 条件状语从句用法 2.掌握 because 两大句式与时态统一规则 3.牢记 if 从句核心考点：主将从现 4.区分 because 与 so、because 和 because of 的区别 学习目标 语法导入 —— 状语从句概念 状语从句：用完整句子修饰主句，表原因、条件等 本节课两类从句：原因、条件状语从句 because 引导原因，解释事情发生的缘由 if 引导条件，描述假设带来的未来结果 because 引导原因状语从句・含义 because 意为 “因为”，从句说明原因，主句表结果 语序一：主句在前 + because + 从句 例句：I like paper-cutting because it’s Chinese art. 语序二：Because 从句放句首，加逗号再接主句 例句：Because it’s traditional, we should protect it. because 从句时态规则 主从句时态必须保持一致，无特殊变化 一般现在时：描述常态、客观事实 He learns puppetry because he loves folk culture. 一般过去时：描述过去发生的事 She stayed home because she was busy yesterday. because 核心禁忌 1：不能和 so 连用 because 表原因，so 表结果，二者二选一，不可同句 错误：Because arts are dying, so we protect them. 正确 1：Arts are dying, so we protect them. 正确 2：We protect arts because they are dying. because 核心禁忌 2：回答 why 只用 because why 用来提问原因，答句必须使用 because —Why do you join the art club? —I join it because I want to learn shadow puppets. 不能用 if、so 回答 why 问句 易混辨析：because vs because of because + 完整句子（主谓齐全） because of + 名词、名词短语、动名词 例句 1：I love puppets because they are beautiful. 例句 2：I love puppets because of their beauty. if 引导条件状语从句・基础含义 if 翻译为 “如果”，提出假设条件 满足从句条件，主句就会出现对应结果 两大基础语序，逗号使用有区分 核心黄金规则：主将从现（重中之重） 主将从现讲解 if 从句（条件）：一律用一般现在时 主句（结果）：用一般将来时 will + 动词原形 结构 1：If + 现在时，主句将来时（加逗号） If you practice, you will cut nice paper works. 结构 2：主句将来时 if + 现在时（无逗号） if 从句主语三单变形规则 从句主语是 he/she/it/ 单数名词，动词变三单 If he learns puppetry, he will spread this art. learn→learns，末尾加 s 对比：If they learn puppetry, they will spread it. if 引导否定条件句 从句否定：主语 + don’t/doesn’t + 动词原形 If we don’t protect arts, we will lose them. 主句否定：will not=won’t + 动词原形 If she doesn’t join the club, she won’t learn cutting. if 一词两种含义拓展区分 条件状语从句：if = 如果，遵循主将从现 宾语从句：if = 是否，时态跟随主句变化 例句 1（条件）：If you come, I will show puppets. 例句 2（宾语）：I don’t know if he will come. because 与 if 从句对比表格 引导词 作用 时态规则 标志性考点 because 说明原因 主从句时态统一 不与 so 连用，回答 why if 提出假设条件 主将从现 从句用一般现在时 解题步骤 1 选词填空判断逻辑 1.先判断前后句逻辑：因果用 because 2.前后为假设条件关系，选用 if 3.句首 If 首字母必须大写 4.因果句可提取关键词 why、busy、reason 5.条件句可提取 will、soon、next 等将来标志 解题步骤 2 两句合并为 because 复合句 1.找出表结果的句子作主句，表原因作从句 2.主句在前直接加 because 连接从句 3.从句放句首，末尾加逗号隔开主句 4.统一主从句时态，不能出现时态冲突 5.不可同时添加 so，删掉多余连词 解题步骤 3 两句合并为 if 条件句 1.找出表假设的句子作 if 从句 2.从句改为一般现在时，去掉 will 3.结果句作主句，保留 will + 动词原形 4.从句前置加逗号，后置不用逗号 5.注意三单、否定 don’t/doesn’t 变形 易错点 1 主将从现时态颠倒 错误：If you will practice, you make good works. 错误原因：从句不能使用将来时 will 改正：If you practice, you will make good works. 口诀：if 从句永远现，主句将来 will 现 易错点 2 because 与 so 叠加使用 错误：Because I like art, so I join the club. 修正方案二选一：删 because 或删 so 正确：I like art, so I join the club. 正确：I join the club because I like art. 易错点 3 because of 后接完整句子 1.错误：I love art because of it has long history. 2.because of 后只能接名词短语，不能接句子 3.改正：I love art because it has long history. 4.有主谓完整句子，统一用 because 易错点 4 过去时态不统一 1.错误：He missed the show because he is busy. 2.主句 didn’t 为过去式，从句同步用 was 3.改正：He missed the show because he was busy. 4.看到过去时间词，前后时态全部变过去 题型一 if/because 选词填空 1.We save paper-cutting __________ it is precious culture. 2._______ we keep practicing, we will master puppetry. 3.She records puppet shows _______ she wants to share them. 4._______ you ignore old arts, they will disappear slowly. 5.I didn’t take part in the activity _______ I was ill. because If because If because 6.Folk arts attract teenagers _______ they are full of beauty. 7.The puppet looks vivid _______ you control it skillfully. 8.Many elders love paper-cutting _______ they grew up with it. 9._______ more students learn traditional skills, they won’t disappear. 10.We respect folk artists _______ they carry on old culture. because if because If because 题型二 单项选择题 1.—Why do you learn shadow puppets? —_______they carry thousands of years of history. A. If B. Because C. So 2.If you _______hard, you _______make perfect paper-cuts. A. work; will B. will work; do C. work; do 3.We should protect old crafts, _______they are disappearing. A. if B. because C. so 4._______you refuse to learn folk arts, you _______lose traditional knowledge. A. If; won’t B. If; will C. Because; will 5.Because she loves culture, _______she learns puppetry. A. so B. / C. but B A B B B 6.He skipped the folk show yesterday _______he had a test. A. if B. because C. when 7.People _______spread paper-cutting if they _______school activities. A. will help; hold B. help; hold C. will help; will hold 8.The old craft can stay alive _______young people take it up. A. because B. if C. though 9.I admire folk artists _______they stick to traditional skills. A. if B. so C.because 10.If he _______free, he _______watch the puppet performance. A. is; will B. will be; will C. is; does B A B C A 题型三 句型合并改写 1.She loves shadow puppets. They show old stories.（用 because 合并） 2.You learn paper-cutting. You will know Chinese culture.（if 从句前置） 3.Traditional arts are in danger. We need to protect them.（分别用 because、so 写两句） 4.If you practice daily, you will be skilled.（改写，从句放句末） If you learn paper-cutting, you will know Chinese culture. ①We need to protect them because traditional arts are in danger. ②Traditional arts are in danger, so we need to protect them. You will know Chinese culture if you practice daily. She loves shadow puppets because they show old stories. 题型四 句子改错 1.Because many folk arts disappear, so we should protect them. 2.If she will practice more, she learns paper-cutting well. 3.I enjoy puppets because of they have special beauty. 4.If we give up old arts, we lost our cultural treasure one day. 5.She missed the craft show because she is busy last Sunday. 删掉 so will practice→practices；learns→will learn because of→because lost→will lose is→was 核心知识点复盘 1.because 表原因，主从句时态统一，不与 so 连用 2.if 条件从句核心规则：主将从现 3.because 后接完整句子，because of 后接名词短语 4.回答 why 问句只能使用 because 5.if 从句主语三单动词变形，否定用 don’t/doesn’t 易混知识点对比总结 1.因果逻辑→because；假设条件逻辑→if 2.从句放句首，末尾必须加逗号分隔主句 3.because + 句子；because of + 名词 / 动名词 4.if 从句只用一般现在时，主句搭配 will 5.because 和 so 不能同时出现在同一个句子 教学课件 Unit1 语法专项 —— if&because状语从句 Thank you for listening! 30 $