基础动词用法 情态动词系统讲解-2025-2026学年高考复习高中英语语法知识点全解（人教版）

高中人教版 【语法专版】 基础动词用法全解 语法专版 【专题】情态动词系统讲解 情态动词专项突破 考频分析 人教版高中语法全解中，情态动词是基础动词用法的重要语法模块，考频占词法总量的15%左右， 贯穿试卷所有核心题型：单项选择3-4题、完形填空2-3题、语法填空2-2题、书面表达核心考察， 直接影响句子得体性与语气准确性。在语境理解类题目中，情态动词的推测用法、虚拟语气及词义 辨析往往是解题关键。 考查内容 ●基本词义辨析：can/could、may/might、.must/have to、shall/should、wil/would、need/dare的核心语 义与语气强弱对比 ·推测用法层级：对现在/过去/将来情况推测的句式结构(must/may/might/.cant+动词原形have done) 及语境判断 。特殊用法与答语：neen't/don't have to的否定意义，must提问的否定回答(needn't/don't have to), should have done的虚拟语气表达 知识点一：情态动词的功能及基础用法 1.表能力（现在/过去） 。常见情态动词：can(现在)、could(过去) ·例句：(1)She can speak three languages.(现在能力)(2)I could swim when I was five.(过去能力) 2.表许可（请求/允许） ●常见情态动词：may/might(正式)、can/could(口语) ·例句：(I)May I come in?(请求许可，正式)(2)You can use my phone..(给予许可，口语) 3.表推测（可能性） ·常见情态动词：must(肯定推测，90%)、may/might（可能推测，50%-70%) 。例句：(I)He must be at home now.(肯定推测)(2)It might rain tomorrow.(可能推测) 1 高中人教版 【语法专版】 基础动词用法全解 4.表义务/建议 ·常见情态动词：must(必须，主观)、have to(不得不，客观)、should(应该，建议) 。例句：(1)You must follow the rules..(主观义务)(2)We should protect the environment..(提出建议) 知识点二：情态动词基础用法 1.can/could(能力、许可、可能性) 。基本含义：can表示“能、会”（能力）、“可以”（许可，口语中常用）：could是can的过去式， 可表示过去的能力或语气更委婉的请求 。否定形式：can't(不能、不可以)：couldr't(过去不能) ●例句： 1.I can speak English.（能力：我会说英语。) 2.You can go now.（许可：你现在可以走了。) 3.Could you help me?(委婉请求：你能帮我吗？) 4.It could rain tomorrow.(可能性：明天可能会下雨。) 2.may/might(许可、可能性) 。基本含义：may表示“可以”（许可，正式场合常用）、“可能”（可能性比might稍大）：might 是may的过去式，可表示过去的许可或可能性更小的推测 ·否定形式：may not(不可以、可能不)：might not(可能不) ·例句： 1.You may enter the room.(许可：你可以进入房间。) 2.She may be at home.(可能性：她可能在家。) 3.He might come late.(可能性更小：他可能会迟到。) 3.nust/have to(必须、不得不) ●基本含义：must表示“必须”（主观上认为有必要）：have to表示“不得不”（客观上的需要，有 人称和时态变化) ·否定形式：mustn't(禁止，不允许)：don't/doesn't/didn't have to(不必) 。例句： 1.You must finish your homework first..(主观必须：你必须先完成作业。) 2.It's raining,so I have to take an umbrella.(客观不得不：下雨了，所以我不得不带伞。) 3.You mustn't smoke here.(禁止：你不允许在这里吸烟。) 4.should/ought to（应该) ●基本含义：should和ought to都表示“应该”，ought to语气稍强，结构为ought to+动词原形 高中人教版 【语法专版】 基础动词用法全解 。否定形式：shouldn't:ought not to 。例句： 1.You should study hard.(你应该努力学习。) 2.We ought to help each other..(我们应该互相帮助。) 3.You shouldn't spend too much time on games.(你不应该花太多时间在游戏上。) 5.need(需要) 。基本含义：作情态动词时表示“需要”，常用于否定句和疑问句，肯定句中常用need to do:作 实义动词时有人称和时态变化，结构为need+名词/todo ·否定形式（情态动词）：needn't(不必) 。例句： 1.leed I go now?(情态动词，疑问句：我需要现在走吗？) 2.You needn't worry.（情态动词，否定句：你不必担心。) 3.He needs to buy a new pen.(实义动词：他需要买一支新钢笔。) 6.had better(最好) 。基本含义：表示“最好做某事”，用于提出建议，结构为had better+动词原形，缩写为'd better 。否定形式：had better not+动词原形 ·例句： 1.You'd better go to bed early.(你最好早点睡觉。) 2.We had better not talk loudly here.(我们最好不要在这里大声说话。) 知识点三：情态动词 1.基础含义及用法（中考必背） 。can(能/会)→例句：She can speak three languages. ·may(可以/何能)一例句：May I borrow your pen? ·must(必须/一定)→例句：You must finish your homework first.. 。should(应该)→例句：We should help each other. 。will(将要/愿意)→例句：I will visit my aunt next week 。would(将会/愿意)→例句：Would you like some tea? 。need(需要)一例句：You need finish the work today. 。had better(（最好)→例句：You had better go to bed early.. 2.否定形式与疑问结构（中考核心) 否定形式： 3 高中人教版 【语法专版】 基础动词用法全解 。can→can't→例句：He can't swim across the river. ·may→may not→例句：You may not park here. ·must→nustn't(禁止)/needn't(不必)→例句：You mustn't smoke here./You needn't come early. 。should→shouldn't→例句：You shouldn't eat too much candy.. 疑问结构： 。Can+主语+动词原形？→例句：Can you play the piano? ·Must+主语+动词原形？→例句：Must I hand in the report today? 。Should+主语+动词原形？→例句：Should we take an umbrella? 3.情态动词表推测（中考易错） 。must(（肯定推测，用于肯定句)→例句：He must be at home now. 。may/might(可能推测，may可能性大于might)→例句：She may come to the party./It might rain tomorrow ·cant（否定推测，用于否定句)→例句：HIe can't be in the office,he left an hour ago. ·could(委婉推测或过去可能性)一→例句：This could be the right answer./She could speak English when she was five. 考法精析 考法一：情态动词表推测的否定形式辨析 核心：区分mustn't与can't表否定的用法差异，mustn't表禁止，can't表否定推测 真题1（语法填空)： The light is off.He be at home.I think he has gone out. 答案：can't解析：根据语境“灯关了”，此处表示否定推测“不可能在家”，应用cant:mustn't 表“禁止”，不符合句意。 真题2（完形填空）： Youpark here.It's a no-parking area. A.mustn't B.can't C.needn't D.may not 答案：A解析：由“no-parking area”可知此处表示“禁止停车”，mustn't表禁止，符合句意；can't 表否定推测，needn't表不必，may not表可能不或不允许（此处非推测或许可），均不符合。 考法二：情态动词表推测的综合运用 核心：结合时间语境（现在过去）及推测强度（肯定/否定可能)，选择正确的情态动词形式（基础 形式或”情态动词+have done'”结构) 高中人教版 【语法专版】 基础动词用法全解 真题1（语法填空)： The door is locked.He(go)out.I saw him take the keys just now. 答案：must have gone解析：由'door is locked'及”saw him take the keys'”可知，对过去动作进行肯 定推测，用'must have+过去分词”，go的过去分词为gone。 真题2（完形填空）： -Where is Lucy?She be in the classroom. -No,shebe there.I saw her leave school 10 minutes ago. A.must;can't B.may,mustn't C.might;needn't D.should;couldn't 答案：A解析：第一空表肯定推测，一定在”用must:第二空根据”saw her leave'”表否定推测”不 可能在”用can't,符合知识点二”否定推测用cant的规则。 考法三：情态动词表推测的综合运用 核心：结合语境判断推测的肯定程度，掌握不同情态动词表推测的用法及强度差异 真题1（单项选择）： He be at home now.The light in his room is on A.must B.may C.might D.can 答案：A解析：由“房间的灯亮着”这一语境可知，对“他在家”的推测可能性极高，ust表示 肯定推测(90%)，符合语境：may和might表示可能推测，强度较弱：can通常不用于肯定句表推 测。 真题2（语法填空)： She_(finish)her homework already.She is playing outside now. 答案：must have finished解析：根据“她现在正在外面玩”可推测她“一定已经完成了作业”，表 对过去情况的肯定推测，用must have done结构，finish的过去分词为finished。 解题小妙招 否定推测用cant,禁止含义mustn't: 现在推测用原形，过去推测have done; 肯定推测must最强，might可能不确定， 被动结构be done跟，情态+have been done。. 真题演练 演练一：单项选择试题（共10题） 1.Youtouch the hot stove.It's dangerous. A.mustn't B.can't C.needn't D.may not 高中人教版 【语法专版】 基础动词用法全解 2.The ground is dry.It rained last night. A.must have B.can't have C.should have D.needn't have 3.-Could I borrow your dictionary? -Yes,you_. A.could B.might C.can D.must 4.She have finished the work on time,but she was ill. A.must B.should C.might D.need 5.The door was open.Heforgotten to lock it before leaving. A.must have B.can have C.should have D.would have 6.Youwear a seatbelt when driving.It's the law. A.can B.must C.may D.might 7.-Must I return the book today? -No,you_.You can keep it for another week. A.mustn't B.can't C.needn't D.shouldn't 8.The lost wallet found by a kind stranger yesterday A.must be B.must have been C.can be D.should have been 9.Hespeak French fluently when he was in Paris. A.can B.could C.must D.should 10.You have told me the truth earlier.Now it's too late. A.must B.can C.should D.might 演练二：填空试题（共10题） l.The lights are on.They_be at home.(肯定推测) 2.You not smoke in the hospital..（禁止) 3.she looks upset..Youhave apologized to her..（本应该) 4.一I use your phone? 一Yes,you一.（请求许可，口语） 5.He have missed the bus,or he would be here by now.(否定推测，过去) 6.We-protect wild animals to keep the balance of nature..（义务，建议) 7.The package have been delivered yesterday,but it''s still missing.(肯定推测，过去) 8.You_have bought so many apples..We still have plenty.(本不必) 9.When I was young,I_swim across the river.(过去能力) l0.Shenot have heard the doorbell..I rang it three times.(可能不，过去) 演练三：语法填空试题（共10空） 6 高中人教版 【语法专版】 基础动词用法全解 阅读下面短文，在空白处填入适当的情态动词或“情态动词+have done”结构。 Last Sunday,I planned to meet Lily at the library,but she didn't show up.I waited for an hour and then left.Later,I called her,but she didn't answer. 1.She_(forget)our appointment,but she never forgets things like that.Or maybe she(get)stuck in traffic.I heard there was a car accident on the main road. When I got home,my mom said Lily had called.She said she_(go)to the hospital because her grandma fell ill."You(tell)me earlier!"I thought.If I had known,I(visit)her grandma with her. Lily later apologized and said,"I(call)you,but my phone died.I(borrow)aphone from the hospital, but I was in a hurry.” Itold her,"You(not worry)about it.Family comes first."Still,I wonder why she(not send)a message before leaving.Maybe she(be)too anxious to think clearly. 答案区 演练-：1.A2B3.C4.B5.A6B7.C8B9.B10.C 1.must 2.must 3.should 4.Can;can 5.must have 6.should 7.must 8.needn't 9.could 10.might 1.can't have forgotten 2.might have got 3.had to go 4.should have told 5.would have visited 6.would have called 7.could have borrowed 8.needn't have worried 9.didn't dare to send/couldn't send 10.must have been 7