U4 情态动词完成式-2025-2026学年高中英语必修三语法知识点全解（沪教版）

高中英语沪教牛津版 【语法专练】 必修3-U4情态动词完成式 语法精讲 情态动词完成式 高中英语核心语法点 考频分析 沪教牛津版必修3-U4中，情态动词完成式是重要语法点，考频占句法总量的15%左右，主要分布 在核心题型：单项选择(1-2题)、完形填空(2-3题)、语法填空(1-2题)、阅读理解（词义推测及 语境理解题中辅助分析)。在语境推理类题目中，情态动词完成式表示对过去情况的推测或虚拟语 气的用法是解题核心。 考查内容 。基本结构与语义辨析：”情态动词+have+过去分词'的肯定式、否定式(can't/couldn't/may not/might not+have done)、疑问式(Could/Can/Might.have done??)的构成及对应语义（推测、虚拟、责备等） 。语境应用场景：对过去情况的推测(must have done表肯定推测，might have done表可能性推测)、 虚拟语气中表未实现动作(should have done本应该，needn't have done本不必)、特定情态动词固 定搭配(could have done本能够，would have done本会) 。易错点辨析：must have done与may have done的语气强度差异，should have done与ought to have done的用法区别，can't have done与couldn't have done的语义一致性 知识点一：情态动词完成式的结构及用法 1.基本结构（情态动词+have+过去分词） l.肯定式：must/may/might/could/should/need-have+-done 2.否定式：can't/couldn't/may not/might not+have+done 3.疑问式：Can/Could/May/Might+主语+have+done? 4.例句： 。She must have finished the work.(肯定式) ·They can't have arrived yet..(否定式) 。Could he have passed the exam?(疑问式) 高中英语沪教牛津版 【语法专练】 必修3-U4情态动词完成式 2.核心语义功能（表示对过去情况的推测或判断) 1.must have done(肯定推测，”一定做过”)→例句：He must have seen the film.(他一定看过这部电 影) 2.may/might have done(可能推测，”或许/何能做过，)→例句：She might have forgotten the meeting (她可能忘了会议) 3.could have done(能力推测或虚拟语气，”本可以做却未做')→例句：You could have told me earlier.. (你本可以早点告诉我) 4.should/.ought to have done(责任义务，”本应该做却未做')→例句：He should have apologized..(他 本应该道歉的) 5.can't/couldn't have done(否定推测，”不可能做过”)→例句：They can't have gone out in this rain (这种天气他们不可能出门) 3.常见易错点区分 1.must have done vs.may have done:must表”肯定”(90%以上把握)，may表”可能”(50%左右把 握) →对比：(I)The ground is wet,so it must have rained.(地面湿了，一定下过雨)(2)It may have rained last night.(昨晚可能下过雨) 2.could have done vs..should have done:could表'能力范围内未做'，should表”义务上未做 →对比：(I)I could have won the game.(我本可以赢比赛)(2)I should have won the game.(我本该 赢比赛) 知识点二：情态动词完成式的用法与被动结构 l.must have done(对过去情况的肯定推测，“一定做过”) 1.基本用法：表示说话人根据已知事实，对过去发生的事情做出有把握的肯定判断。 2.主动结构：主语+must have+动词过去分词 例句：(I)She must have arrived home already.(她一定已经到家了。)(2)They must have finished the project on time.(他们一定按时完成了项目。) 3.被动结构：主语+must have been+动词过去分词 例句：(1)The window must have been broken by Tom.(窗户一定是汤姆打破的。)(2)This book must have been read by many students.(这本书一定被很多学生读过了。) 2.can't have done(对过去情况的否定推测，“不可能做过”) 1.基本用法：表示说话人根据已知事实，对过去发生的事情做出有把握的否定判断。 高中英语沪教牛津版 【语法专练】 必修3-U4情态动词完成式 2.主动结构：主语+can't have+动词过去分词 例句：(I)He can't have stolen the money..He was with me all day.(他不可能偷了钱，他一整天都和我 在一起。)(2)They can't have left without saying goodbye.(他们不可能不告而别。) 3.被动结构：主语+can't have been+动词过去分词 例句：(I)The door can't have been opened by a child..It's too heavy.(这扇门不可能是孩子打开的，太 重了。)(2)This mistake can't have been made by a careful person.(这个错误不可能是细心的人犯的。) 3.could have done（过去本可能做但未做，“本来可以”) 1.基本用法：表示过去有能力或机会做某事，但实际上没有做，带有遗憾或责备的语气。 2.主动结构：主语+could have+动词过去分词 例句：(I)You could have passed the exam if you had studied harder.(如果你更努力学习，你本来可以 通过考试的。)(2)She could have helped us,but she didn't.(她本来可以帮助我们的，但她没有。) 3.被动结构：主语+could have been+动词过去分词 例句：(I)The problem could have been solved earlier.(这个问题本来可以早点解决的。)(2)More lives could have been saved with better medical care.(如果有更好的医疗条件，更多的生命本来可以被挽救 的。) 4.should have done(过去本应该做但未做，“本应该") 1.基本用法：表示过去应该做某事但实际上没有做，含有”责备”或”建议”的语气。 2.主动结构：主语+should have+动词过去分词 例句：(I)You should have told me the truth.(你本应该告诉我真相的。)(2)He should have arrived here an hour ago.(他本应该一小时前就到这儿的。) 3.被动结构：主语+should have been+动词过去分词 例句：(I)The work should have been finished yesterday.(这项工作本应该昨天就完成的。)(2)This letter should have been sent last week.(这封信本应该上周就寄出的。) 5.needn't have done(过去本不必做但做了，“本不必") 1.基本用法：表示过去没有必要做某事，但实际上却做了，强调”多余”或”浪费”。 2.主动结构：主语+needn't have+动词过去分词 例句：(I)You needn't have bought so much food.We have enough.(你本不必买这么多食物，我们已 经够了。)(2)She needn't have hurried..The meeting was delayed.(她本不必着急，会议推迟了。) 3.被动结构：主语+needn't have been+动词过去分词 例句：(I)The room needn't have been cleaned again.It was already clean.(这个房间本不必再打扫了， 已经很干净了。)(2)The report needn't have been typed twice.One copy was enough.(这份报告本不 必打印两份，一份就够了。) 6.might have done（过去可能做过，“可能已经”) 高中英语沪教牛津版 【语法专练】 必修3-U4情态动词完成式 1.基本用法：表示对过去发生的事情的可能性推测，语气比'must have done'”弱，不确定。 2.主动结构：主语+might have+动词过去分词 例句：(I)He might have gone to the library.I saw him heading that way..(他可能去图书馆了，我看到 他朝那个方向走了。)(2)They might have forgotten about the meeting.(他们可能忘记会议了。) 3.被动结构：主语+might have been+动词过去分词 例句：(I)The package might have been delivered yesterday.(这个包裹可能昨天就已经送达了。)(2) This song might have been heard by many people..(这首歌可能已经被很多人听过了。) 知识点三：情态动词完成式 1.基本结构与含义（核心语法） 1.肯定式：情态动词+have+过去分词→表示对过去情况的推测、遗憾、义务等 2.否定式：情态动词+not+have+过去分词→表示对过去情况的否定推测或未完成义务 2.常见情态动词用法（中考必背) l.must have done(一定做过)→例句：She must have finished her homework,because she is watching TV now. 2.may have done(可能做过)→例句：He may have gone to the library,butI'm not sure.. 3.might have done(或许做过)→例句：They might have arrived home already. 4.should have done(本应该做却没做)→例句：You should have told me the truth yesterday. 5.shouldn't have done(本不应该做却做了)→例句：He shouldn't have broken the window: 6.needn't have done(本不必做却做了)→例句：You needn't have bought so much food. 7.could have done(本能够做却没做)→例句：She could have passed the exam with more effort, 3.语境应用（中考易错) l.推测过去动作：The ground is wet.It must have rained last night. 2.表达后悔遗憾：I should have studied harder for the test. 3.否定推测：He can't have left,because his bag is still here. 4.委婉批评：You might have told me you were coming late. 考法精析 考法一：情态动词完成式的推测语气辨析 高中英语沪教牛津版 【语法专练】 必修3-U4情态动词完成式 核心：根据语境中说话人的把握程度，区分must have done(肯定推测)与may/might have done(可 能推测)的用法 真题1（语法填空)： The door is locked.They(go)out for shopping. 答案：must have gone 解析：由”门是锁着的”这一明确证据可知，说话人对”他们出去购物”有90%以上的肯定把握，用 must have done结构，go的过去分词为gone。 真题2（单项选择)： -Why didn't you answer my call? -I(be)in the shower.I didn't hear it. A.must have been B.may have been C.should have been D.could have been 答案：B 解析：语境中对”在洗澡”的推测仅为可能性(50%左右把握)，无明确证据支持肯定推测，用may have been:must表肯定推测（把握过大），should表义务未履行，could表能力未做，均不符合语境。 考法二：推测语气与虚拟语气辨析 核心：根据语境判断是对过去情况的推测还是与过去事实相反的虚拟假设，选择正确的情态动词完 成式 真题1（语法填空）： The ground is completely dry,so it _(rain)last night. 答案：can't have rained 解析：由The ground is completely dry”可知，对过去情况进行否定推测，”不可能下过雨”，用can't have done结构。 真题2（单项选择)： If you_(tell)me the truth earlier,I wouldn't have made such a mistake. A.should tell B.told C.have told D.had told 答案：D 解析：此处为与过去事实相反的虚拟语气，if条件句中用had done结构，主句用would have done。 考法三：情态动词完成式的综合运用 核心：结合语境判断情态动词完成式的推测语气强度，区分主动/被动结构，并遵循时态呼应规则 真题1（单项选择）： The door was locked when I got home.My sister-gone out without telling me. A must have B may have C should have D needn't have 答案：A 解析：由”门是锁着的”这一已知事实可对过去情况做肯定推测(90%以上把握)，must have done 符合语境：B项may have表”可能”(50%把握)，此处证据明确故排除；C项表”本该做未做”，D 项表”本不必做却做了”，均与句意不符。 真题2（语法填空）： 5 高中英语沪教牛津版 【语法专练】 必修3-U4情态动词完成式 The old photos_(must take)by my father 20 years ago.They look so clear. 答案：must have been taken 解析：主语'photos'”是动作take”的承受者，需用被动结构'must have been+过去分词'；由时间状 语”20 years ago”可知是对过去情况的肯定推测，take的过去分词为taken。. 解题小妙招 情态动词推测妙招 推测语气看把握，must肯定may可能： 过去推测用完成，have done跟在后； 否定推测can't用，把握十足才可行： 虚拟语气看条件，过去相反had done: if条件用had done,主句would加完成： 结合语境辨语义，情态虚拟不混淆。 真题演练 演练一：单项选择试题（共10题） 1.The room is empty.They-left for the airport. A must have B may have C should have D could have 2.-Why didn't you attend the meeting? -Iforgotten about it.I'm so sorry. A must have B might have C should have D need have 3.If we_arrived earlier,we would have caught the first train. A have B had C were D are 4.She looks upset.She-heard the bad news. A must have B may have C should have D need have 5.Youtold me the truth earlier.Now it's too late. A must have B might have C should have D could have 6.The ground is dry,so it_rained last night. A must have B may have C can't have D should have 7.Hewon the race if he hadn't fallen down. A must have B might have C should have D need have 8.My mother said I eaten all the cookies,but I only had one. A must have B may have C should have D need have 6 高中英语沪教牛津版 【语法专练】 必修3-U4情态动词完成式 9.-Could they have finished the project on time? -No,they_.They lacked enough resources. A mustn't have B shouldn'thave C can'thave D needn't have 10.You_washed the clothes-I would have done it this afternoon. A mustn't have B shouldn't have C can't have D needn't have 演练二：填空试题（共10题） 1.The teacher said we(review)the lesson before the exam,but most ofus didn't. 2.If you_(call)me,I would have picked you up from the station. 3.She looks tired.She(work)all night. 4.You(not buy)so much milk-we still have plenty in the fridge. 5.The door was open,so someone(break)into the house last night. 6.He-(apologize)for his rudeness,but he didn't. 7.IfI(know)the truth earlier,I would have made a different decision. 8.They_(miss)the bus,or they would have arrived by now. 9.You_(tell)me you were coming-I would have prepared dinner. 10.The accident _(avoid)if the driver had been more careful. 演练三：语法填空试题（共10空） A recent survey shows that many students regret not studying harder in high school.One student said,"I_ (get)better grades ifI_(spend)less time on video games."Another student admitted,"My parents warned me about procrastination,but I ignored them.I(listen)to their advice." Teachers also shared their observations."Students often think they_(pass)exams without serious prepa- ration,"said Mr.Li,a math teacher."But last year,a top student failed because he_(overestimate)his abilities.He-(score)90+if he_(not skip)the review classes." Experts suggest that teenagers-(learn)time management skills early."Without self-discipline,students _(achieve)their goals,"one expert noted."It'snever too late to change,but regret is useless.What matters is that you(start)taking action now." 答案区 演练-：1.A2B3B4.A5.C6.C7B8.A9.C10D 1.should have reviewed 2.had called 3.must have worked 4.needn't have bought 5.must have broken 6.should have apologized 7.had known 8.must have missed 9.should have told 10.could have been avoided 1.would have got 2.had spent 3.should have listened 4.can have passed 5.had overestimated 7 高中英语沪教牛津版 【语法专练】 必修3-U4情态动词完成式 6.would have scored 7.hadn't skipped 8.should have learned 9.can't have achieved 10.must start 8