Unit2语法讲解及习题_ 现在完成时 & 动词不定式表目的 2025-2026学年教科版(五四学制) 七年级英语下册

该初中英语单元知识清单系统梳理了教科版（五四学制）七下Unit2核心语法，涵盖现在完成时（肯定式及否定式）与动词不定式表目的（to, in order to, so as to）两大范畴，搭建从基本概念、句式构成到用法解析、标志词识别再到易错避坑的递进式学习支架。 清单以“概念拆解+对比辨析+情境应用”构建知识体系，如现在完成时标注“has/have与人称搭配”“过去分词变化”等重难点，动词不定式对比三种结构的语气正式度与位置要求，培养学生语言能力与思维品质。设计分类习题（填空、否定转换、单选等）及带解析答案，配备“高频不规则动词速记”“同义句互换示例”等实用工具，助力学生自主高效学习，教师可据此优化教学环节提升课堂实效。

教科版（五四学制）英语七下Unit2语法讲解及习题: 现在完成时 & 动词不定式表目的 本单元两大核心语法： 1. 现在完成时（肯定式&否定式） 2. 动词不定式表目的（to, in order to, so as to） 一、语法知识点讲解 （一）语法1：现在完成时（Present perfect: affirmative and negative） 1. 基本概念 现在完成时，连接过去发生的动作和现在的结果/影响，不强调动作具体发生在过去几点，只突出“到现在为止，这件事已经做完/还没做”。 贴合本单元话题：通讯、智能手机、科技发展、未来交通。 2. 基本句式构成 （1）肯定句：主语 + have/has + 动词过去分词 （2）否定句：主语 + haven’t/hasn’t + 动词过去分词 ✅ 人称搭配规则： · I / you / we / they → have / haven’t · he / she / it / 单数人名/单数事物 → has / hasn’t 3. 动词过去分词变化 规则动词：直接词尾加-ed（work→worked, play→played） 不规则动词：特殊变形（参考课本末尾不规则动词表） 高频不规则速记：go→gone, see→seen, make→made, buy→bought 4. 本单元核心用法 1）表示过去发生的动作，对现在造成持续影响 例句：Smartphones have changed our daily life a lot. 智能手机极大地改变了我们的日常生活。 2）表示到目前为止，已经/尚未完成某事 例句：I have used this new online app. 我已经用过这款新线上软件。 例句：He hasn’t learned to use the new camera. 他还没学会使用这款新相机。 5. 常见标志词 already（已经）、just（刚刚）、never（从未）、ever（曾经）、so far（到目前为止）、before（从前） 6. 易错避坑 ❌ 错误：She have bought a new phone. ✅ 正确：She has bought a new phone.（第三人称单数必须用has） ❌ 错误：I have send a message. ✅ 正确：I have sent a message.（have/has后必须加过去分词） （二）语法2：动词不定式表目的（Infinitive of purpose） 1. 基本含义 用 to do / in order to do / so as to do，表达做某件事，是为了达成后续的目标、目的。 2. 三种结构用法对比 结构 语气正式度 位置要求 to + 动词原形 最日常、最通用 句中、句首都可以 in order to + 动词原形 稍正式、书面 句中、句首都可以，句首优先用它 so as to + 动词原形 正式书面 只能放在句中，不能放句首 3. 否定形式 · 标准否定：in order not to do / so as not to do · 日常否定：极少用 to not do 4. 单元话题例句 We use smartphones to communicate with others. 我们用智能手机和他人沟通。 People invent new transport in order to make travel easier. 人们发明新型交通，为了让出行更便捷。 He joins the speech club so as to improve his spoken English. 他加入演讲社团，来提升自己的英语口语。 5. 同义句互换 I go online to study English. = I go online in order to study English. = I go online so as to study English. 三者语义完全相同，写作中可灵活替换。 6. 易错提醒 ❌ 错误：I use the phone to reading news. ✅ 正确：I use the phone to read news.（to 后必须加动词原形） 二、专项练习题 （一）用have / has 正确形式填空 1. I ______ bought a new smartphone. 2. She ______ learned how to take photos with the phone. 3. We ______ read the magazine article about smartphones. 4. They ______ talked about future transport. 5. My dad ______ used this new app before. 6. You ______ never joined an online meeting. （二）将下列句子改为否定句 1. I have learnt a lot about technology. _____________________________________________________________________ 2. Smartphones have changed our life. _____________________________________________________________________ 3. He has finished the radio interview. _____________________________________________________________________ 4. We have talked about our different opinions. _____________________________________________________________________ 5. She has tried this new camera. _____________________________________________________________________ （三）单项选择题 1. People use phones ______ easily with their friends. A. communicate B. to communicate C. communicating 2. He surfs the Internet ______ get useful information. A. in order to B. so as C. to they 3. We follow traffic rules ______ keep ourselves safe. A. not to B. so as to C. so as 4. ______ improve his tech skills, he practices every day. A. To B. In order C. So as to 5. I write down notes ______ forget important things. A. to not B. in order not to C. so as 6. They save pocket money ______ buy a new laptop. A. to B. for C. so as （四）同义句转换 1. He uses a phone to talk with his family.（改写为in order to结构） _____________________________________________________________________ 2. We work hard so as to have a better future.（改写为to结构） _____________________________________________________________________ 3. In order to join the space show, she practices a lot.（改写为to结构） _____________________________________________________________________ 4. They go online to learn new things.（改写为so as to结构） _____________________________________________________________________ （五）用括号内单词的正确形式填空 1. Technology ______ (change) our life a lot these years. 2. I ______ (not finish) reading the article yet. 3. They ______ (make) great progress in communication already. 4. She comes early ______ (get) a good seat in the hall. 5. We learn English ______ (use) it in the future. 6. He ______ (never try) this new kind of transport. （六）句子改错（找出错误并改正） 1. She have bought a new phone last week. _____________________________________________________________________ 2. I go there to learning new skills. _____________________________________________________________________ 3. They hasn’t heard of the new technology. _____________________________________________________________________ 4. So as to pass the test, he studies very hard. _____________________________________________________________________ 5. We use phones order to keep in touch. _____________________________________________________________________ 三、参考答案+解析 （一）用have / has 填空答案 1. have 解析：主语为第一人称I，固定搭配have。 2. has 解析：主语she是第三人称单数，用has。 3. have 解析：主语we为复数，用have。 4. have 解析：主语they为复数，用have。 5. has 解析：单数主语my dad，第三人称单数，用has。 6. have 解析：主语为you，固定搭配have。 （二）改为否定句答案 1. I haven’t learnt a lot about technology. 解析：have + not 缩写为haven’t。 2. Smartphones haven’t changed our life. 3. He hasn’t finished the radio interview. 解析：has + not 缩写为hasn’t。 4. We haven’t talked about our different opinions. 5. She hasn’t tried this new camera. （三）单项选择答案 1. B 解析：to + 动词原形，表行为的目的。 2. A 解析：in order to + 动词原形，表目的。 3. B 解析：so as to + 动词原形，表目的。 4. A 解析：so as to不能放在句首，句首表目的优先用To / In order to。 5. B 解析：否定目的固定用in order not to do。 6. A 解析：to + 动词原形，表购买新电脑的目的。 （四）同义句转换答案 1. He uses a phone in order to talk with his family. 2. We work hard to have a better future. 3. To join the show, she practices a lot. 4. They go online so as to learn new things. （五）正确形式填空答案 1. has changed 解析：主语technology为单数，时间标志these years，用现在完成时。 2. haven’t finished 解析：yet是现在完成时否定句标志，主语I，用haven’t。 3. have made 解析：already是现在完成时标志，主语they复数，用have。 4. to get 解析：不定式表目的，早早到场是为了占好座位。 5. to use 解析：不定式表目的，学英语是为了未来使用。 6. has never tried 解析：never为现在完成时标志，主语he单数，用has。 （六）句子改错答案&修正 1. 错误：have → 改为：She has bought a new phone. 解析：第三人称单数主语，助动词用has。 2. 错误：learning → 改为：I go there to learn new skills. 解析：不定式to后必须加动词原形。 3. 错误：hasn’t → 改为：They haven’t heard of the new technology. 解析：复数主语they，否定形式用haven’t。 4. 错误：So as to放句首 → 改为：To / In order to pass the test, he studies very hard. 解析：so as to禁止放在句首。 5. 错误：缺少in → 改为：We use phones in order to keep in touch. 解析：固定搭配in order to，不能省略in。 ( 1 ) 学科网（北京）股份有限公司 $