必修1 情态动词系统讲解-备战2025-2026学年高中英语上学期期末语法全解（沪教版）

ENGLISH-高中系列资料（沪教版） 必修1-U5情态动词系统讲解 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（重点考察，直接影响语气表达与语境适配）。在语 境理解类题日中，情态动词的语气辨析、推测用法及情景交际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： ·基本含义与语气表达：can/could、may/might、.must/have to、.should/ought to、will/would等情态动词 表能力、许可、推测、义务、意愿等的核心语义辨析； ·推测用法与句式结构：情态动词+动词原形（对现在将来推测）、情态动词+have done(对过去推测) 的句式特征及反义疑问句搭配； ·虚拟语气与语境适配：情态动词在虚拟条件句（如if I were you,I would…)、建议句型(suggest/insist 后的从句用should-+动词原形)中的特殊用法，以及委婉表达(could/would you..)的交际场景应用。 精讲精练 知识点一：情态动词的分类及基础用法 ·能力与许可类情态动词 -常见类型：can/could(能力/许可，coud为can的过去式或委婉语气) -例句：☐She can speak three languages..(表能力)口Could I use your phone?(表委婉请求许可) ·推测与可能性类情态动词 -常见类型：may/might(可能/许可，might可能性比may低)、must(肯定推测) -例句：☐He may be at home now.(表可能推测)This must be your book.(表肯定推测) ·义务与建议类情态动词 -常见类型：must/have to(必须，must强调主观义务，have to强调客观需要)、should/ought to(应 该建议) -例句：口You must obey the rules.(表主观义务)口We should learn from each other..(表建议) ·情态动词的否定形式 -常见否定：can't(不可能不允许)、mustn't(禁止)、人needn't(不必) -例句：口You can't park here.(表不允许)口You needn't come early tomorrow.(表不必) 【即学即练】 1.【能力表达】一_I use your dictionary?-Sure,go ahead. A.Must B.May C.Need D.Should 2.【否定形式】You_park here.The sign says"No Parking”.(用情态动词否定形式填空) 3.【义务表达】We_follow the school rules.(用must/have to填空，强调主观义务) 4.【推测表达】The light is on.He_be at home now.(用must/may/might填空，表肯定推测) 5.【委婉请求】一_you pass me the salt?一Of course.(用can/could填空，表委婉) 高中|英语|沪教版|必修1-U5 ENGLISH-高中系列资料（沪教版） 知识点二：情态动词的高级用法与易错点辨析 ·情态动词表推测的时态差异 1.对现在当前状态的推测 -结构：must/may/might/can't+be(形容词/名词)I动词原形（状态动词） 一例句： *The light is on.He must be at home.(灯亮着，他一定在家。) *She might be busy now.Let's call later.(她现在可能很忙，我们稍后打电话。) *It can't be true.He never lies..(这不可能是真的，他从不撒谎。) 2.对过去动作的推测 -结构：must/may/might/can't+have+动词过去分词 一例句： *The ground is wet.It must have rained last night.(地面湿了，昨晚一定下过雨。) *She may have forgotten the meeting.(她可能忘记会议了。) *He can't have finished the work in an hour.(他不可能在一小时内完成这项工作。) ·情态动词have done的特殊含义 -should/ought to have done(本该做却未做) *例句：You should have told me the truth earlier.(你本该早点告诉我真相。) -needni't have done(本不必做却做了) *例句：You needn't have bought so much food.Ve have plenty..(你本不必买这么多食物，我们还 有很多。) -could have done(本可以做却未做，含遗憾) *例句：She could have won the race if she had tried harder.(如果她再努力一点，本可以赢得比赛。) ·情态动词的语气强弱对比 -许可：can(☐语)<may(正式)<could/might(委婉，可能性更低) *例句： ·Can I borrow your pen?(☐语，日常请求) ·May I interrupt your speech?(正式场合，礼貌请求) ·Might I ask for a glass of water?(极其委婉，罕见) -推测：must(90%肯定)>may(50%可能)>might(30%可能)>cant(0%肯定，否定推测) *例句： ·He must be the manager.(几乎确定) ·He may come to the party.(不确定，有可能) ·He might change his mind.(可能性较低) ·He can't be the thief..He was with me all day.(完全否定) ·易错点：情态动词与实义动词的区分 1.need/dare的双重词性（情态动词vs实义动词） 一情态动词：无人称变化，直接加not否定，后接动词原形 *例句：You needn't worry about me.(情态动词，否定needn't) -实义动词：有人称变化，需借助助动词do否定，后接todo *例句：She needs to finish her homework first.(实义动词，三单needs+to finish) 2.must与have to的替换限制 -must强调主观义务，否定用mustn't(禁止) *例句：We must follow the school rules.(主观认同的义务) -have to强调客观需要，否定用don't have to(不必) *例句：I have to wear glasses because'l m short-sighted.(客观视力问题导致) -过去时/将来时中must不可用，需用had to/will have to *例句：He had to leave early yesterday.(过去时用had to,不可用must) 知识点三：情态动词的特殊结构与语境应用 ·情态动词的被动语态 -基础结构：情态动词+be+动词过去分词 一例句： *This work must be finished by Friday.(这项工作必须在周五前完成。) *The rules should be obeyed by everyone.(每个人都应遵守规则。) *Your question might be answered later.(你的问题稍后可能会被解答。) *Smoking can't be allowed in public places..(公共场所不允许吸烟。) ·情态动词与虚拟语气的结合 -与f条件句搭配（表假设） *例句： ·If I could fly,I would travel around the world.(如果我会飞，我要环游世界。) ·You might get better grades if you studied harder.(如果你更努力学习，可能会取得更好成绩。) ·If he must leave,he should tell us first..(如果他非要走，应该先告诉我们。) -固定句型"t's+形容词+that+情态动词” *例句： ·t's necessary that we should attend the meeting.(我们有必要参加会议。) ·lt's strange that he should refuse the offer.(他竟然拒绝了提议，真奇怪。) ·情态动词的语境差异 -时间语境对情态动词的影响 *例句： ·现在时：She can speak French fluently.(她现在能流利说法语。) ·过去时：She could speak French when she was young.(她年轻时会说法语。) 将来时：You will have to take the exam next month.(你下个月必须参加考试。) 一文体语境的语气调整 *例句： ·☐语：Can you pass the salt?(递下盐好吗？) ·书面语：Students must submit their papers by the deadline..(学生必须在截止日期前提交论文。) 虚拟语气：If I might make a suggestion,.we could try a new method.(若允许我提建议，我们可 以尝试新方法。) ·情态动词与其他语法点的结合 一情态动词+进行时（表正在进行的动作推测） *例句： ·He must be reading in the library now.(他现在一定在图书馆看书。) ·They might be discussing the problem at this moment..(他们此刻可能正在讨论问题。) -情态动词+完成进行时（表持续动作的推测） *例句： ·She must have been waiting for us for hours..(她一定等了我们好几个小时了。) ·He can't have been working all day without a break.(他不可能一整天都在工作没休息。) 高中|英语|沪教版|必修1-U5 ENGLISH-高中系列资料（沪教版） 考法一：情态动词表推测的时态差异 ·核心：根据语境判断推测对象为现在状态或过去动作，选择“情态动词+b/动词原形”或“情态动词 +have+过去分词”结构 ·真题1（语法填空）： -The door is locked.He_(go)out. -答案：must have gone解析：由“门是锁着的”可知对过去“外出”这一动作进行肯定推测，用“must have+过去分词”结构。 ·真题2（单项选择）： --Why didn't Peter answer the phone? --He be sleeping.His bedtime is 9 pm A.must B.must have C.may have D.can -答案：A解析：由上下文语境可知对现在“正在睡觉”的状态进行推测，用“must+be+现在分词”(sleep- ing为现在分词，此处省略be与sleeping直接搭配)，must表肯定推测。 ·真题3（单句改错）： You can't finished the project alone.It's too difficult. 一答案：finished-have finished解析：对过去“完成项目”这一动作进行否定推测，应用“can'thave+ 过去分词”结构，finished前缺少have。 考法二：情态动词表推测及时态差异 ·核心：根据语境判断推测的时间（现在过去），选择正确的情态动词+时态结构 ·真题1（语法填空）： The door is locked.They _(go)out for dinner. -答案：must have gone解析：由“门是锁着的”可知是对过去动作的肯定推测，应用must have+过 去分词结构，go的过去分词为gone。 ·真题2（单项选择）： She looks worried.She_about the exam results now. A.must worry B.must be worrying C.must have worried D.must have been worrying -答案：B解析：由时间标志词“now”可知是对现在正在进行动作的推测，应用must be+现在分词 结构，worry的现在分词为worrying。. 考法三：情态动词综合应用与语境推测 ·核心：结合情态动词的分类、推测时态差异及被动语态，根据语境判断情态动词的含义和形式（包，括情 态动词+have done结构、被动语态及语气强弱) ·真题1（单项选择）： The broken window_by Tom yesterday.He__more careful. A.must be broken;should be B.must have been broken;should have been C.might break;must be D.could be broken;might have been -答案：B解析：第一空，根据时间标志词“yesterday'”及“broken window”可知是对过去动作的被 动推测，结构为“情态动词+have been+过去分词”，“must have been broken”表示“一定是被打 破了”；第二空，“should have been more careful”表示“本该更小W心（却未做到）”，符合语境。 ·真题2（语法填空）： You_(not buy)so much fruit.It_(keep)in the fridge for only two days and now most of it has gone bad. -答案：needn't have bought;can be kept解析：第一空，“needn't have done”表示“本不必做却做 了”，符合“买了太多水果但坏掉了”的语境；第二空，主语“it”(指代fruit)是动作“keep”的承受 者，用被动语态，“can be kept'”表示“能被保存”，符合“冰箱里只能保存两天”的客观描述。 高中|英语|沪教版|必修1-U5 ENGLISH-高中系列资料（沪教版） 真题演练 演练一：单项选择（共10题） 1.The lights are off.Theybe at home now. A.must B.may C.can't D.might 2.-Why didn't you answer my call?-Sorry,I-have been sleeping.I didn't hear it. A.must B.must have C.may have D.can 3.You _told me the news earlier.I missed the chance to help. A.should B.should have C.need D.need have 4.If she _harder,she could have passed the exam A.study B.studied C.had studied D.studies 5.The ground is dry.It_rained last night. A.must have B.can't have C.may have D.should have 6.-I use your computer for a while?-Sure,go ahead. A.Must B.Should C.May D.Need 7.He_be in the library.I saw him go there ten minutes ago. A.must B.can C.might D.need 8.Youbought so much bread.We still have some left. A.needn't B.needn't have C.mustn't D.can't have 9.She looks upset.She_about the result of her interview now. A.must worry B.must be worrying C.must have worried D.must have been worrying 10.This task _finished by Friday,or we will miss the deadline. A.must be B.must have been C.may be D.can be 演练二：填空试题（共10题） 1.The door was open.Someone_(break)into the house last night. 2.You_(not park)here.The sign says "No Parking". 3.She_(finish)the work by now.Let's check her desk. 4.If I(know)the truth,I would have told you earlier. 5.He_(be)at the meeting,but I'm not sure. 6.You-(take)an umbrella.It's going to rain. 7.The book_(return)to the library last week,but I forgot. 8.They_(wait)for us at the station.Let's hurry up. 9.She_(not come)to the party.She has to study for the exam. 10.This report_(submit)by 5 pm today. 演练三：语法填空（共10空） It was a cold winter morning.Mr.Smith woke up late and realized he_(miss)the early bus."I_(set) my alarm last night,he muttered to himself.He quickly got dressed and ran to the street,but the bus -(leave)already. A taxi passed by,and he waved."you take me to the office quickly?"he asked the driver.The driver nodded,and they sped off.Mr.Smith checked his watch and thought,"I(arrive)on time if there's no traffic.” However,the road was crowded."We-(get)stuck here for hours,"the driver said.Mr.Smith sighed. He(call)his boss to explain,but his phone battery was dead."This day_(be)worse!"he thought. Finally,they arrived at the office.Mr.Smith rushed in and saw his boss."I'm sorry I'm late.The bus (break)down,"he said.His boss smiled and said,"You_(not lie).I saw you get off the taxi just now!" 答案 演练一：单项选择 1.C2.A3.B4.C5.B6.C7.A8.B9.B10.A 演练二：填空试题 1.must have broken 2.can't park 3.must have finished 4.had known 5.might be 6.should take 7.should have been returned 8.must be waiting 9.might not come 10.must be submitted 演练三：语法填空 1.had missed 2.should have set 3.must have left 4.Can 5.might arrive 6.might get 7.should have called 8.can't be 9.must have broken 10.needn't have lied 高中1英语|沪教版|必修1-U5