Unit5语法专项 宾语从句课件 2025-2026学年外研版英语八年级下册

教学课件 外研英语八年级下册 Unit 5语法专项—— 宾语从句（that/if/whether引导） 全解精讲+分层练习 1 学习目标 理解宾语从句的定义及在复合句中的作用 掌握that/if/whether引导宾语从句的核心用法 牢记宾语从句的陈述语序核心规则 区分if和whether的通用与特殊使用场景 能在语境中正确选用引导词并完成句式转换 宾语从句的基础定义 复合句中，充当主句宾语的句子叫宾语从句 宾语从句替代名词/代词，作主句谓语的宾语 基本结构：主句 + 引导词 + 宾语从句 本单元重点学习that/if/whether三类引导词 核心用途：表达事实、观点或不确定的疑问 核心引导词用法对比（一） 引导词 含义与作用 能否省略 that 无实义，仅起连接作用 口语/非正式文体可省 if 表“是否”，连接主句与疑问从句 不可省略 whether 表“是否”，连接主句与疑问从句 不可省略 本单元核心考点，需精准区分使用逻辑 核心引导词用法对比（二） 引导词 适用场景 主句常见谓语 that 陈述客观事实、确定观点 know, believe, say, tell, learn if/whether 表达疑问、不确定的信息 ask, wonder, be sure, want to know 贴合本单元“自然探索”，多用于科学探究语境 that引导的宾语从句·核心用法 用于表达确定的事实/观点，无疑问含义 that无实义，不充当从句任何成分 口语/非正式书面语中可直接省略that 正式文体中，保留that更符合语法规范 从句始终遵循主语+谓语的陈述语序 that引导的宾语从句·例句 We know (that) the Sahara is the largest desert. People believed (that) dinosaurs lived for millions of years. The teacher said (that) the Amazon has millions of species. I learn (that) the polar ice is melting little by little. 括号内that可省略，句意保持不变 if/whether引导的宾语从句·核心用法 二者均表“是否”，用于疑问/不确定的语境 有实际含义，不可省略，是主从句的连接关键 从句必须用陈述语序，不可用疑问语序 主句多为表达疑问、探究的谓语动词 多数普通语境中，if和whether可互换使用 if/whether引导的宾语从句·通用例句 Scientists aren't sure if there is life on Mars. We want to know whether the plant can live in the desert. She asked if we would visit the nature museum. I wonder whether the old tree is over 1000 years old. 以上例句中if/whether可直接互换 if/whether的特殊用法·只能用whether 与or not直接连用时，只能用whether 位于介词后面时，只能用whether 后接不定式（to do）时，只能用whether 本单元重点考点：or not连用的情况 这三类场景是if和whether的核心区分点 只能用whether的例句（一） We're not sure whether or not the bird can fly far. I don't know whether or not he will join the exploration team. She wonders whether or not the river is over 100 meters wide. whether or not 不可替换为if or not 只能用whether的例句（二） It depends on whether we can get enough water. I'm thinking about whether to go on the field trip. They are talking about whether the plan will work. 介词后/不定式前，均不可用if替代whether 宾语从句的核心规则·陈述语序 无论主句是陈述句还是疑问句 宾语从句都必须使用主语+谓语的陈述语序 不可使用疑问语序（助动词/系动词提前） 这是宾语从句的必考规则，需严格遵守 判断语序是否正确是解题的关键步骤 宾语从句语序·错误与正确对比 错误：He asked if where had I been. 正确：He asked where I had been. 错误：Do you know if is it a new animal? 正确：Do you know if it is a new animal? 错误：I wonder whether can we find the forest. 正确：I wonder whether we can find the forest. 语序规则·实战小技巧 看到宾语从句，先找从句的主语和谓语 确保主语在前，谓语（动词/系动词）在后 遇到特殊疑问词，保留疑问词放从句句首 疑问词后直接接主语+谓语，无需调整 做题时先判断语序，再选择引导词 that引导的宾语从句·拓展注意 当主句谓语是think/say/tell等动词，且从句是多个并列句时，第一个that可省，后续that不可省 例：He said (that) he liked nature and that he would go hiking. 正式书面语中，为保证句子严谨，建议全程保留that if/whether使用·易混点提醒 if 既可以引导宾语从句表“是否”，也可以引导条件状语从句表“如果” 做题时需结合语境判断if的含义 例：I don't know if it will rain tomorrow.（是否，宾语从句） 例：If it rains tomorrow, we won't go out.（如果，条件状语从句） 宾语从句·语境解题思路 第一步：判断主句表达的是确定事实还是疑问 第二步：确定事实用that，表疑问用if/whether 第三步：检查是否有只能用whether的特殊场景 第四步：验证从句是否为陈述语序 第五步：确认引导词使用符合语法规则 练习一：用that/if/whether填空 1.People think ________ the panda is the cutest animal in the world. 2.I don't know ___________ the lake is deep enough for swimming. 3.The teacher told us ________ the Amazon is in South America. 4.They wonder ____________ they can see the northern lights tonight. 5.We believe ________ wild animals need our protection. that if/whether that if/whether that 练习二：用that/if/whether填空 1.I'm not sure ___________ or not we can finish the exploration on time. 2.The report shows ____________ the number of pandas is increasing. 3.She asked me _____________ I had ever been to a nature reserve. 4.It's up to you ___________ we go by bus or by bike. 5.We all know ___________ the earth is round and it goes around the sun. whether that if/whether whether that 练习三：句型转换（直接引语变间接引语） 1."The tiger is a protected animal," he said. He said ________ the tiger is a protected animal. 2."Will you go to the zoo with me?" she asked me. She asked me _____________ I would go to the zoo with her. 3."The forest has many rare plants," the guide told us. The guide told us ___________ the forest has many rare plants. that if/whether that 练习四：句型转换（合并句子） 1.Is the red panda only found in China? We want to know. We want to know ___________ the red panda is only found in China. 2.Oceans cover most of the earth's surface. We learned it. We learned ________ oceans cover most of the earth's surface. 3.Will the snow melt completely in spring? We're not sure. We're not sure _____________ the snow will melt completely in spring. if/whether that if/whether 练习五：单项选择 1.I know _______ the Great Wall is one of the world's wonders. A. that B. if C. whether D. where 2.She wonders _______ the flowers will bloom in March. A. that B. if C. what D. who 3.The book says _______ the desert is getting smaller every year. A. that B. if C. whether D. how A B A 练习六：单项选择 1.I'm not sure _______ I should take a camera or not on the trip. A. that B. if C. whether D. which 2.They talked about _______ they would set up a tent in the forest. A. that B. if C. whether D. when 3.He wondered _______ the river is clean enough to drink. A. that B. if C. both A and B D. both B and C C C D 练习七：单句改错 1.I don't know if or not he will come to the party. 2.She asked that where I found the beautiful stone. 3.Do you know if is the nature park open on Monday? 4.We believe that the earth is flat and the sun goes around it. 5.It depends on if we can get help from the local people. if→whether 删that is it→it is flat→round if→whether 练习八：情景对话补全 1.A: Do you think ___________ the fox lives in this forest? B: Yes, I heard _______ someone saw a fox here yesterday. 2.A: I'm not sure ____________ we can cross the river safely. B: Let's ask the farmer ____________ he has a boat for us. 3.A: The scientist said ____________ the plant can cure some illnesses. B: I didn't know ____________ it has such an important use. if/whether that if/whether if/whether that that 宾语从句·高频错题总结 1.混淆if的两种含义，误判从句类型 2.忽略or not连用，错用if代替whether 3.宾语从句使用疑问语序，主谓颠倒 4.正式文体中随意省略that，导致句子不严谨 5.介词后错用if，未替换成whether 核心知识点·速记口诀 宾语从句三要素，引导语序要记住 陈述事实用that，可省可留看文体 表是否用if/whether，互换有例外 or not介后不定式，只选whether别出错 不管主句啥句式，从句陈述别颠倒 课堂小结 宾语从句是充当主句宾语的句子，基本结构为主句+引导词+从句 that表陈述可省略，if/whether表是否有特殊使用规则 陈述语序是宾语从句的核心规则，任何情况不可违反 解题先判语境和语序，再选引导词，关注whether的特殊场景 结合主题多造句、多练习，熟练运用核心知识点 教学课件 Unit 5语法专项—— 宾语从句（that/if/whether引导） Thank you for listening! 30 $