ID: 25291988

Unit 5 Play by the rules 语法专项——动词不定式表目的课件(共28张PPT)外研版英语八年级上册

日期:2026-03-21 科目:英语 类型:初中课件 查看:29次 大小:882878B 来源:二一课件通
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Unit,课件,八年级,英语,外研版,PPT
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(课件网) 教学课件 外研版八年级上册 Unit 5 语法专项———动词不定式表目的 全解精讲+分层练习 学习目标 1.掌握不定式表目的的核心结构与用法 2.区分to do/in order to do/so as to do的差异 3.学会目的状语的同义转换及易混点辨析 4.能熟练运用该语法完成各类题型 一、语法定义 动词不定式(to do)表目的,指用to do结构 说明动作发生的目的或意图,即“做某事为了做另一件事” 在句中作目的状语,位置灵活 可置于句子末尾,也可置于句子开头 二、核心用法1:基本结构(句末作状语) 最常用结构:主语 + 谓语 + 宾语/状语 + to do sth. 作用:说明动作的目的,无需强调 例句1:He went to the library to borrow some books. 例句2:She studies hard to pass the exam. 二、核心用法1:基本结构(句首作状语) 强调目的结构:To do sth., 主语 + 谓语 + 其他. 注意:句首不定式后用逗号与主句隔开 例句1:To catch the early bus, he got up at 5 o’clock. 例句2:To improve my English, I take an online course daily. 二、核心用法2:三者对比 结构 位置要求 否定形式 to do 句首/句末 not to do in order to do 句首/句末 in order not to do so as to do 仅句末 so as not to do 二、核心用法2:in order to do 例句 句末:We practiced hard in order to win the match. 句首:In order to win the match, we practiced hard. 否定:In order not to miss the train, we hurried up. 总结:可放句首/句末,否定直接加not在to前 二、核心用法2:so as to do 例句 句末正例:He spoke quietly so as to wake the baby. 句首错例:So as to wake the baby, he spoke quietly. 否定:He spoke quietly so as not to wake the baby. 总结:只能放句末,否定为so as not to do 二、核心用法3:目的状语的从句表达 除了不定式,还可用从句表目的 后接完整句子,常搭配can/could/will/would 两种核心结构:so that + 从句 in order that + 从句 二、核心用法3:so that + 从句 用法:日常表达,仅置于句末 常配情态动词:can/could(最常用) 原句:He studies hard to pass the exam. 转换:He studies hard so that he can pass the exam. 要点:补充主语,保持语义一致 二、核心用法3:in order that + 从句 用法:正式表达,可置于句首/句末 常配情态动词:could/would 原句:To arrive on time, we left early. 转换:In order that we could arrive on time, we left early. 要点:句首用逗号,与主句分隔 三、易混点提醒1:不定式表目的vs作宾语 表目的:不定式是状语,修饰整个句子 说明“做某事的目的是什么” 作宾语:不定式是宾语,跟在动词后 回答“动词的对象/内容是什么” 三、易混点提醒1:对比例句(表目的) 1.She bought a pen to write with. (to write with修饰bought,表买笔的目的) 2.He opened the door to let the cat in. (to let the cat in修饰opened,表开门的目的) 3.We read books to gain knowledge. (to gain knowledge修饰read,表读书的目的) 三、易混点提醒1:对比例句(作宾语) 1.She wants to buy a pen. (to buy a pen是want的宾语,回答“想要做什么”) 2.He hopes to travel around the world. (to travel是hope的宾语,回答“希望做什么”) 3.They decide to study hard. (to study hard是decide的宾语,回答“决定做什么”) 三、易混点提醒2:不定式符号to vs 介词to 表目的的to:不定式符号,后接动词原形 介词to:属于固定搭配,后接动词-ing形式 关键:判断to的词性,避免形式错误 技巧:熟记常考的 ... ...

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