情态动词系统复习-备战2026届高考英语一轮复习语法全解（沪教版）

ENGLISH-语法复习系列资料（沪教版） Chapter1情态动词系统复习 考频分析 情态动词是高中英语词法的重要模块，考频占词法总量的5%左右，贯穿试卷多个核心题型：单项选择 1-2题、完形填空2-3题、语法填空1-2题、书面表达（核心考察，直接影响语气表达与语境适配）。在语 境理解类题目中，情态动词的语气辨析、用法区别及情景应用往往是解题关键。 考查内容 高中英语对情态动词的考察聚焦三大维度，覆盖基础用法与语境应用： ·基本词义辨析：can/could、may/might、.must/have to、shall/should、will/would、need/dare的核心语 义与语气强弱对比； ·推测用法：情态动词表肯定推测(must/could/may)、否定推测(can't/couldn't)、可能性推测的语境判 断及反义疑问句搭配； ·特殊用法与固定结构：情态动词+have done的虚拟语气与过去推测（如needn't have done)、shall用 于第三人称表规定/警告、would rather等固定句型中的情态动词使用。 精讲精练 知识点一：情态动词的基本含义及用法 ·1.can/could(能力/许可/推测) 一能力：表示具备做某事的能力，coud为过去式或委婉语气 -例句：She can speak three languages fluently..(现在能力)D|could swim when I was five.(过去 能力) -许可：表示允许做某事，could比can语气更委婉 -例句：口You can use my dictionary if you need it.(非正式许可)口Could I leave the room for a moment?(委婉请求许可) 一推测：用于否定句和疑问句表推测，coud可能性低于can -例句：口The answer can't be right.(否定推测)口Could this be the right path?(疑问推测) ·2.may/might(许可/推测/祝愿) -许可：用于正式场合表示允许，might语气更委婉 -例句：口You may start the exam now.(正式许可)口Might I ask for your name?(委婉请求) -推测：表示可能性，might可能性低于may -例句：It may rain tomorrow according to the forecast.(可能推测)She might have forgotten the appointment.(对过去的推测) 一祝愿：用于肯定句表祝福 -例句：May you succeed in your career!!(祝愿) ·3.must/have to(必须推测) -must(主观必须)：强调说话人主观上认为必须做某事 -例句：You must follow the school rules.(主观要求) -have to(客观必须)：强调因客观条件不得不做某事，过去式为had to -例句：☐She has to work overtime today because of the deadline.(现在客观需要)口They had to cancel the trip due to bad weather..(过去客观情况) 一推测：用于肯定句表肯定推测，意为”一定” -例句：He must be at home now.(肯定推测) ·4.should/ought to(建议债任/推测) -建议：表示应该做某事，ought to后接动词原形，语气比should稍强 -例句：☐You should study harder for the exam.(建议)☐We ought to help those in need.(责任) 一推测：表示按常理推测”应该会” -例句：The train should arrive in five minutes.(推测) ·5.wil/would(意愿/习惯/推测) -意愿：wil表示现在意愿，woud表示过去意愿或委婉请求 -例句：口I will help you with the project.(现在意愿)口She would always share her snacks with classmates.(过去习惯) 一习惯：wi训表示经常性、习惯性动作，would为过去式 -例句：He will often go for a walk after dinner.(现在习惯) -推测：表示推测或预料 -例句：This will be the book you're looking for..(推测) ·6.need/dare(必要性/敢于) -need:作情态动词时用于否定句和疑问句，表”需要”，肯定句中常用need to do -例句：☐You needn't come early tomorrow.(否定)口Need I hand in the report today?(疑问) 一dare:作情态动词时用于否定句和疑问句，表”敢于”，过去式为dared -例句：口She dare not speak in public.(否定)☐Dare he challenge the authority?(疑问) 【即学即练】 1.【can/could用法】-_I use your phone for a call?-Yes,you can. A.Must B.Could C.Need D.Should 2.【must/have to辨析】She_go to the hospital because she is seriously ill.(客观必须) A.must B.have to C.has to D.hadto 3.【may/might推测】It-rain this afternoon,but'm not sure.(可能性较低) A.must B.may C.might D.can 4.【need情态动词用法】You_worry about me-I can take care of myself. A.needn't B.don't need C.need not to D.not need 5.【will/would习惯】He_often play basketball after school when he was young. A.will B.would C.shall D.should 语法复习|英语」沪教版 ENGLISH-语法复习系列资料（沪教版） 知识点二：情态动词的特殊用法及易错点 ·1.情态动词表推测的可能性层级 一口可能性由高到低排序 -must(一定，90%以上)>should/ought to(应该，80%左右)>may(可能，50%左右)>might/could (或许，30%左右) -口句式限制 -must仅用于肯定句；can/could仅用于否定句和疑问句（否定式can't/couldn't表”不可能”）；may/might 可用于肯定句和否定句（否定式may not/might not表”可能不”） 一例句： -口The light is on..He must be in the office.(肯定句，高可能性) -口She might not attend the meeting tomorrow.(否定句，低可能性) -☐Can this be the solution to the problem？(疑问句，表推测) ·2.情态动词+have done的用法（对过去的推测/虚拟） -口must have done(肯定做过)：用于肯定句，表对过去动作的肯定推测 -例句：He must have finished the task,for he is relaxing now. -口can't/couldn't have done(不可能做过)：用于否定句，表对过去动作的否定推测 -例句：She can't have taken your book--I saw her leave with empty hands. -·may/might have done(可能做过)：用于肯定句或否定句，表对过去动作的不确定推测 -例句：They might have arrived at the station on time,butI'm not sure. -口should/ought to have done(本应该做却没做)：表虚拟语气，含责备或遗憾 -例句：You should have told me the truth earlier..(实际设告诉) -口needn't have done(本不必做却做了)：表虚拟语气，含多余之意 -例句：You needn't have bought so much food-we have plenty left. ·3.情态动词的委婉用法及回答 -口can/could/may/might表请求许可的回答 -肯定回答：Yes,you can/may./Sure.Of course. -否定▣答：No,you can't/may not./Sorry,you can't.(could/might提问仍用can/may▣答) -例句：一Could I borrow your pen?-Yes,you can.(不用could回答) -口will/would表请求的语气差异 -wil用于第二人称请求：Will you please pass the salt?(语气直接) -would用于第二人称请求更委婉：Vould you mind opening the window? -口must表必须的回答 -肯定回答：Yes,you must.(必须) -否定▣答：No,you needn't.INo,you don't have to.(不必) -例句：一Must I hand in the report today?一No,you needn't.You can do it tomorrow. ·4.易混淆情态动词辨析 -☐must vs.have to -must强调主观义务，否定式mustn't(禁止)：You mustn't smoke here.(禁止吸烟) -have to强调客观必要，否定式don't have to(不必)：You don't have to come if you're busy. -☐can vs.be able to -can仅用于现在/过去时(could),be able to可用于各种时态： -She has been able to speak French since she was5.(现在完成时用be able to) -should vs.had better -should表建议（应该）：You should see a doctor. -had better表警告（最好），否定式had better not:You had better not go out alone at night.(语气更 强) ·5.情态动词的习惯搭配及固定句型 -☐would rather do sth..(宁愿做某事)：I would rather stay at home than go shopping. -口may/might as well do sth.(不妨做某事)：Ve may as well start early to avoid traffic. -Ocan't help doing sth.(忍不住做某事)：She can't help laughing when she hears the joke.(此时 can't表能力，非推测) -口need/dare作实义动词（肯定句中）：He needs to finish his homework first..(need后接todo)/ She dares to face the challenge.(dare后接todo) 知识点三：情态动词的时态与语态进阶 ·1.情态动词的时态呼应 -基础时态搭配（高考核心）： -口现在推测：must/may/might+do(对现在状态推测)→例句：She must know the answer..(她 定知道答案) -☐过去推测：must/may/might+have done(对过去动作推测)→例▣：They might have missed the bus.(他们可能错过了公交车) -口将来推测：will/should+do(对将来情况推测)→例句：The game should finish by9p.m.(比赛 应该在晚上9点前结束) 一时态易错点： -对过去正在进行的推测：must have been doing→例句：He must have been working when I called (我打电话时他一定在工作) ·2.情态动词的被动语态 一基本结构（高考必背） -☐can/could be done(能被.)→例句：This task can be finished in an hour..(这项任务能在一小 时内完成) -口must be done(必须被…)→例句：The work must be completed by Friday..(这项工作必须在 周五前完成) -☐should be done(应该被…)→例句：Children should be taught to respect others.(应该教孩子 尊重他人) 一特殊结构： -need/want/require+doing(表被动，主动形式表被动意义)→例句：The room needs cleaning.(房 间需要被打扫) ·3.情态动词与虚拟语气 一与过去事实相反（高考重点）： -☐should/could/would/might+have done→例句：If I had studied harder,I could have passed the exam.(如果我当时更努力，就能通过考试了) 一与现在事实相反： -口should/could/would/might+do→例句：If I were you,I would choose the red one.(如果我是你， 我会选红色的那个) 一与将来事实相反： -口should/could/ould/might+do→例句：If it rained tomorrow,we might cancel the picnic.(如果明 天下雨，我们可能会取消野餐) ·4.情态动词的否定形式进阶 一否定意义辨析（高考易错）： -☐can't(不可能)vs.may not(可能不)例句：He can't be in Paris(他不可能在巴黎)/He may not agree(他可能不同意) -口mustn't(禁止)vs.needn't(不必)→例句：You mustn't park here(禁止停车)You needn't wait for me(不必等我) -口shouldn't(不应该)vs.oughtn'tto(不应该，语气更强)→例句：You shouldn'tIie(你不应该撒 谎)/You oughtn't to have told him(你本不应该告诉他的) ·5.情态动词的省略与替代 -简略回答（高考常考）： -☐肯定省略：Yes,Ican/No,Ican't→例句：一Can you swim?-Yes,Ican. -口替代词doso/doit/do that→例句：If you should leave,please do so quietly.(如果你要离开，请 安静地走)》 一避免重复： -口用助动词替代情态动词后的动词→例句：She said she would help us,.and she did.(她说会帮我 们，她确实帮了) 语法复习|英语|沪教版 ENGLISH-语法复习系列资料（沪教版） 考法一：情态动词表推测的可能性层级及句式限制 ·核心：根据语境判断推测的可能性高低及句式要求（肯定句否定句疑问句），选择正确情态动词 ·真题1（语法填空）： The light is off in her room.She_be asleep now. 一答案：must解析：由“灯关着”这一语境可知对现在状态表肯定推测，且用于肯定句，故用must(一 定) ·真题2（单项选择）： --Where is Tom?He didn't come to school today. --He-be ill,but I'm not sure. A.must B.may C.can't D.should -答案：B解析：由“不确定”可知可能性较低，且用于肯定句表推测，may(可能)符合语境；must表 肯定推测（一定），can't用于否定句表“不可能”，should表“应该会”，均不符合“不确定”的语气。 考法二：情态动词表推测的时态呼应 ·核心：结合上下文语境和时间线索，判断对现在、过去或将来情况的推测，选择正确的情态动词及动词 形式 ·真题1（语法填空）： -The ground is all wet.It_(rain)last night. 一答案：must have rained解析：由"last night”可知是对过去情况的推测，地面湿这一证据支持肯定推 测，用”must have done”结构，表示”一定下过雨”。 ·真题2（单项选择）： --Where is Lucy?She isn't in the classroom. --She _in the library.I saw her go there just now. A.must be B.may have been C.should be D.can't have been 一答案：A解析：由just now”和当前询问位置可知是对现在状态的推测，”saw her go there”支持肯定 推测，用"”must be”表示”一定在”。 考法三：情态动词的时态呼应与被动语态结合运用 ·核心：综合判断语境中的时间关系及动作的被动性，掌握情态动词+不同时态被动结构的用法（如ust be done/may have been done) ·真题1（单顶选择）： -The meeting_because of the heavy snow,but I'm not sure. A.might cancel B.might have been cancelled C.must cancel D.must have cancelled 一答案：B解析：由“but'm not sure'”可知表不确定推测，应用might;会议是被取消的，需用被动语 态；结合语境“因大雪可能已取消会议”是对过去动作的推测，结构为“might have been+过去分 词”，cancel的过去分词为cancelled。. ·真题2（语法填空）： -This kind of problem(must solve)immediately to avoid more losses. -答案：must be solved解析：主语“this kind of problem”是动作“solve”的承受者，需用被动语态； 情态动词must后接be done结构，故填must be solved。 语法复习|英语」沪教版 ENGLISH-语法复习系列资料（沪教版） 解题小妙招 ·情态动词推测妙招 ·推测先看可能性，肯定must否cant; ·不确定用may/might,.疑问can来把句起； ·肯定句中用must,否定can't要牢记； ·maybe/perhaps不确定，may/might来帮你。 ·情态动词时态妙招 ·现在推测be动词，must be结构记； ·过去推测看时间，last night/.ago是标志； ·must have done表过去，肯定推测很清晰； ·现在状态看语境，just now常表现在时； ·may have been是过去，不确定时用上去。 ·情态动词被动妙招 ·被动结构be done,情态后面be别忘； ·must be done现被动，might have been done过去样； ·主动被动看主语，承受动作被动强； ·情态被动不复杂，情态+be done准没错。 真题演练 演练一：单项选择试题（共10题） 1.You__smoke in the hospital-it's against the rules. A.must B.mustn't C.needn't D.may not 2.The door is locked.He_have gone out for lunch. A.must B.can C.need D.might