Unit 1 现在完成时语法讲义 2025-2026学年外研版八年级英语上册

本初中英语讲义以现在完成时为核心，通过表格系统呈现句式结构，结合分类讲解核心用法与易混点辨析，构建“定义-结构-用法-辨析”的完整知识脉络，突出时态关联与动词使用等重难点。 亮点在于分层练习设计，如用所给动词适当形式填空夯实基础，对划线部分提问训练思维辨析，单项选择强化时态区分，答案解析结合语言能力与学习策略指导，助力学生自主复习，也为教师精准教学提供支持。

外研版八年级上册Unit 1 语法讲解 现在完成时（1） 一、语法定义 现在完成时是由助动词have/has + 动词过去分词构成的时态，核心用于表达两类含义：一是过去发生的动作对现在产生的影响或结果，二是从过去开始并持续到现在的动作/状态。 二、结构详解 句式 结构示例 备注 肯定句 I have finished the work. He has read the book. 第一/二人称、复数用have；第三人称单数用has 否定句 They haven’t seen the movie. She hasn’t arrived yet. have/has后加not，缩写为haven’t/hasn’t 一般疑问句 Have you lived here long? Has he finished his homework? 助动词提至句首，回答用Yes/No + 主语 + have/has/haven’t/hasn’t 特殊疑问句 How long have you studied English? What has she bought? 特殊疑问词 + 一般疑问句结构 三、核心用法 用法1：表过去动作对现在的影响/结果 动作发生在过去，现在能直观感受到其带来的状态变化，常搭配already、just、yet、ever、never、before等时间状语。 · already（已经）：用于肯定句，可置于句中/句末。例：She has already left for school. · just（刚刚）：置于have/has与过去分词之间。例：I have just received his call. · yet（还/尚未）：用于否定句/疑问句末。例：He hasn’t finished the task yet. / Have you finished it yet? · ever（曾经）：用于疑问句。例：Have you ever been to Paris? · never（从未）：用于肯定句表否定。例：They have never seen a panda. 用法2：表过去开始持续到现在的动作/状态 动作从过去某一时间开始，一直延续到当下，常搭配for + 时间段、since + 时间点/一般过去时从句。 · for + 时间段：for 3 years、for a week、for two hours 例：We have lived in this city for 10 years. · since + 时间点：since 2019、since last month、since childhood 例：She has studied English since she was 6 years old. 四、易混点辨析 1. 现在完成时 vs 一般过去时 · 现在完成时：强调过去动作与现在的关联（影响/持续），不具体说明动作发生的时间。 例：I have lost my key.（现在没钥匙，进不去门） · 一般过去时：仅强调过去发生的动作，需搭配具体过去时间状语（yesterday、last week等）。 例：I lost my key yesterday.（仅说明丢钥匙的时间，不强调现在的影响） 2. 瞬间动词与持续动词的使用 瞬间动词（buy、die、join、leave等）不能与for/since连用，需转换为持续动词： · 错误：He has bought the bike for 2 years. · 正确：He has had the bike for 2 years. 语法习题 题型一：用所给动词的适当形式填空 （考查核心结构：have/has + 过去分词，结合时间状语判断） 1. She ______ (drink) three cups of tea today. 2. We ______ (not visit) the Great Wall before. 3. ______ Tom ______ (finish) his homework? 4. My father ______ (work) in this company since 2008. 5. They ______ (just watch) a football match. 6. I ______ (never eat) sushi in my life. 7. ______ you ______ (see) my pen? I can’t find it anywhere. 8. The students ______ (clean) the classroom already. 9. He ______ (live) in London for 5 years, then he moved to Paris. 10. My mother ______ (cook) dinner. Let’s go and eat. 题型二：按要求改写句子 1. Lucy has read this novel three times.（改为否定句） _____________________________________________________________ 2. We have known each other since we were children.（改为一般疑问句并作肯定回答） _____________________________________________________________ _____________________________________________________________ 3. He has lived in Beijing for 8 years.（对划线部分提问） _____________________________________________________________ _____________________________________________________________ 4. They have just bought a new car.（改为一般疑问句并作否定回答） _____________________________________________________________ _____________________________________________________________ 5. I have ever been to Shanghai twice.（对划线部分提问） _____________________________________________________________ _____________________________________________________________ 6. She has already finished her homework.（改为否定句） _____________________________________________________________ _____________________________________________________________ 7. The boys have played basketball for an hour.（对划线部分提问） _____________________________________________________________ _____________________________________________________________ 8. He has never seen such a beautiful place.（改为一般疑问句并作肯定回答） _____________________________________________________________ _____________________________________________________________ 9. We have studied English for 6 years.（对划线部分“since 2018”改写后提问） _____________________________________________________________ _____________________________________________________________ 10. The teacher has corrected all the papers.（改为一般疑问句） _____________________________________________________________ 题型三：单项选择 （考查时态辨析、时间状语搭配、易混动词使用） 1. — ______ you ______ your room? — Yes, I ______ it an hour ago. A. Did; clean; cleaned B. Have; cleaned; cleaned C. Have; cleaned; have cleaned 2. My sister ______ in this school for 3 years and she still works here now. A. works B. worked C. has worked 3. — Has she arrived at the station yet? — No, she ______. She will arrive in 10 minutes. A. hasn’t B. doesn’t C. didn’t 4. I ______ this book for two weeks. I need to return it to the library. A. borrowed B. have borrowed C. have kept 5. — Have you ever ______ to Tokyo? — Yes, I ______ there last year. A. been; went B. gone; went C. been; have gone 6. They ______ never ______ the Great Wall. They plan to go there next month. A. have; seen B. do; see C. will; see 7. How long ______ your parents ______ in this city? A. have; lived B. did; live C. do; live 8. She ______ just ______ a letter to her friend. You can’t call her now. A. has; written B. wrote; has C. is; writing 9. — When ______ you ______ the bike? — Last month. And I ______ it for a month. A. did; buy; have had B. have; bought; had C. did; buy; bought 10. He ______ in Shanghai since 2010, but he ______ to Beijing yesterday. A. lived; moved B. has lived; moved C. has lived; has moved 习题答案与详细解析 题型一：用所给动词的适当形式填空 1. has drunk（主语she为第三人称单数，today表动作持续到现在，用现在完成时） 2. haven’t visited（before用于现在完成时，否定句用haven’t + 过去分词） 3. Has; finished（一般疑问句，主语Tom为第三人称单数，助动词用has） 4. has worked（since 2008表动作从过去持续到现在，主语my father用has） 5. have just watched（just用于现在完成时，主语they用have） 6. have never eaten（never表从未，用于现在完成时，主语I用have） 7. Have; seen（一般疑问句，主语you用have，询问过去动作对现在的影响） 8. have cleaned（already用于肯定句，主语the students用have） 9. lived（后接then he moved to Paris，说明动作已结束，用一般过去时） 10. has cooked（后句“Let’s go and eat”表动作已完成，主语my mother用has） 题型二：按要求改写句子 1. Lucy hasn’t read this novel three times. 解析：现在完成时否定句直接在has后加not，缩写为hasn’t。 2. — Have you known each other since you were children? — Yes, we have. 解析：一般疑问句将have提至句首；肯定回答用“Yes, 主语 + have.”。 3. How long has he lived in Beijing? 解析：对for+时间段提问用how long，后接一般疑问句，主语he用has。 4. — Have they just bought a new car? — No, they haven’t. 解析：一般疑问句将have提至句首；否定回答用“No, 主语 + haven’t.”。 5. Where have you ever been twice? 解析：对地点提问用where，后接一般疑问句结构。 6. She hasn’t finished her homework yet. 解析：否定句将already改为yet，置于句末，has后加not。 7. What have the boys done for an hour? 解析：对动作提问用what，后接一般疑问句，用done替代原动作。 8. — Has he never seen such a beautiful place? — Yes, he has. 解析：一般疑问句将has提至句首；肯定回答用“Yes, 主语 + has.”。 9. How long have you studied English since 2018? 解析：对since+时间点提问也用how long，后接一般疑问句。 10. Has the teacher corrected all the papers? 解析：一般疑问句将has提至句首，主语the teacher为第三人称单数。 题型三：单项选择 1. B 解析：第一空问“是否打扫房间（对现在的影响）”用现在完成时；an hour ago表过去，用一般过去时cleaned。 2. C 解析：for 3 years表动作持续到现在，用现在完成时。 3. A 解析：现在完成时一般疑问句的否定回答用hasn’t。 4. C 解析：borrow是瞬间动词，与for two weeks连用需转换为持续动词keep，用现在完成时have kept。 5. A 解析：have been to表“去过某地（已回）”；last year表过去，用一般过去时went。 6. A 解析：never用于现在完成时，结构为have/has + never + 过去分词。 7. A 解析：how long提问持续时间，用现在完成时。 8. A 解析：just用于现在完成时，结构为has + just + 过去分词。 9. A 解析：第一空问“何时买的”用一般过去时；for a month表持续，buy转换为have，用现在完成时have had。 10. B 解析：since 2010用现在完成时；yesterday表过去，用一般过去时moved。 ( 1 ) 学科网（北京）股份有限公司 $