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（外研版）

高中外研版高中语法全解 【基础动词用法】 情态动词系统讲解 语法专项 情态动词系统讲解 高中英语核心语法 考频分析 基础年级外研版中，情态动词系统讲解是重点语法模块，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(2-3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，情态动词的推测用法、语气差异及情 态意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、shal/should、wil/would、need/dare的核心语 义与语气强弱对比 。推测用法：“情态动词+动词原形”表现在推测、“情态动词+have done”表过去推测的句式结构与 语境判断 ·特殊用法：情态动词用于疑问句的回答规则、shall用于第三人称表命令/规定、would表过去习惯性 动作等固定搭配与情景应用 知识点一：情态动词的基本含义及用法 1.能力表达(can/could): 。基本用法：can表示现在或一般能力，could表示过去能力或委婉语气 。例句： 1.She can speak three languages fluently.(现在能力) 2.My grandfather could swim across the river when he was young.(过去能力) 2.许可与推测(may/might): 。许可用法：may表示正式许可，might语气更委婉 ·推测用法：might可能性比may小，用于肯定句 ·例句： 高中外研版高中语法全解 【基础动词用法】 情态动词系统讲解 l.You may leave the classroom after finishing the test..（正式许可) 2.This book might be John's-his name is on the cover.（可能性推测) 3.义务与必要(must/have to): 。must用法：表示主观必须，否定用needn't(不必) ·have to用法：强调客观需要，过去式用had to 。例句： 1.We must follow the school rules.(主观义务) 2.She had to stay at home because of the heavy rain.(客观必要) 4.建议与责任(should/ought to): ·should用法：表示建议或责任，ought to语气更正式 ·例句： l.You should drink more water in summer.(提出建议) 2.Everyone ought to protect the environment.(强调责任) 5.情态动词的否定形式： ●can't:不可能（推测）/不许（禁止）→He can't be in the library now. 。mustn't:禁止→You mustn't park here. ●needn't:不必→You needn't return the book today.. 知识点二：情态动词基本用法与常见搭配 1.can/could(能力、许可、推测) 。基本含义：can表示”能、会”（能力）、”可以”（许可，口语）、”可能”（推测，用于否定句/凝 问句)；could是can的过去式（表过去能力）：委婉请求（比can更客气，回答用can) ·否定形式：can't=cannot(不能、不可能)：couldn't(过去不能、不允许) ●例句： 1.She can speak three languages.(能力：她会说三种语言) 2.Could I borrow your pen?一Yes,you can.(委婉请求：我能借你的笔吗？一可以) 3.He can't be at home now.(推测：他现在不可能在家) 4.It could rain tomorrow.(推测：明天可能下雨) 2.may/might(许可、推测、请求) 。基本含义：may表示可以”（许可，正式）、”可能”（推测，肯定句）：might是may的过去式 (表过去许可/何能)：可能性比may小 。否定形式：may not(不可以、可能不)：might not(可能不) 高中外研版高中语法全解 【基础动词用法】 情态动词系统讲解 。例句： l.You may leave the classroom now.(许可：你现在可以离开教室) 2.She might come to the party tonight..(推测：她今晚可能来派对) 3.May I use your dictionary?一No,you may not.(请求：我能用你的字典吗？一不可以) 3.must/have to(必须、肯定推测) 。基本含义：must表示”必须”（主观义务）、”一定”（肯定推测，语气强）：have to表示”不得不 (客观需要，有人称/时态变化) ●否定形式：nustn't(禁止)：don't have to=neeh't(不必) 。例句： l.We must follow the school rules.(主观义务：我们必须遵守校规) 2.He has to work late today.(客观需要：他今天不得不加班) 3.This must be your book.(推测：这一定是你的书) 4.You mustn't smoke here.(禁止：你不许在这儿抽烟) 4.need/had better（需要、建议) ·基本含义：need表示”需要”（作情态动词时，用于否定句/疑问句，肯定句用need to do):had better(do)表示”最好做某事”（否定式had better not do) ·例句： 1.You needn't come early tomorrow.(不必：你明天不必早来) 2.Need I finish the task now?一Yes,you must..(需要：我必须现在完成任务吗？一是的) 3.You'd better take an umbrella.(建议：你最好带把伞) 4.We had better not go out alone at night..(否定建议：我们最好不要晚上独自外出) 5.should/ought to（应该、建议) ·基本含义：should表示”应该'（责任、建议，语气比nust弱）：ought to含义同should,结构为 ought to do ·否定形式：houldn't(不应该)；ought not to(不应该) 。例句： I.You should study harder for the exam.(建议：你应该为考试更努力学习) 2.We ought to help the old people.(责任：我们应该帮助老人) 3.You shouldn't eat too much junk food.(不应该：你不应该吃太多垃圾食品) 6.will/would(意愿、习惯、请求) ●基本含义：w表示”将”（将来时）、”愿意”（主观意愿）、”总是”（习惯性动作)：would是will 的过去式（表过去意愿/习惯）：委婉请求（如would you..) ·例句： 1.I will help you with your English.(意愿：我愿意帮你学英语) 3 高中外研版高中语法全解 【基础动词用法】 情态动词系统讲解 2.She would always take a walk after dinner.(过去习惯：她过去总在晚饭后散步) 3.Would you please open the window?(委婉请求：请你打开窗户好吗？) 知识点三：情态动词 1.基础含义与用法（中考必背） 1.can(能/会/可以)→例句：I can swim across the river.(能力)：Can I borrow your pen?(请求许可) 2.may(可以/也许)→例句：May I come in?(请求许可)：It may rain tomorrow.(可能性推测) 3.must(必须/一定)→例句：You must finish your homework first.(必须)：He must be at home now. (肯定推测) 4.should(应该/应当)→例句：We should help each other.(建议)；You should see a doctor.(劝告) 5.wil(将要/愿意)→例句：I will visit my uncle next week.(将来时)：Will you please open the door? (请求) 6.would(将会/愿意)→例句：He said he would come.(过去将来时)；Would you like some tea?(委 婉请求) 7.need(需要)→例句：You needn'twoy(不必)；Need I finish it today?(需要吗) &.dare(敢)→例句：She dare not go out alone.(不敢)：Dare he speak in public?(敢吗) 2.情态动词表推测（中考核心） 1.must(肯定推测，用于肯定句)→例句：The light is on,so he must be in the room, 2.may/might(可能推测，may可能性大于might)→例句：She may come to the party tonight.;He might be late 3.cant(否定推测，用于否定句)→例句：This can't be my book.Mine has a red cover. 4.could(过去可能/委婉推测)→例句：He could speak English when he was five.;Could it be true? 3.情态动词的疑问向与回答（中考易错） 1.can的问答→例句：一Can I go out?一Yes,you can./No,you can't. 2.may的间答→例句：-May I use your phone?-Yes,you may../No,you mustr't, 3.must的间答→例句：一Must I hand in my homework now?-Yes,you must./No,you needn't./No, you don't have to 4.need的问答→例句：—Need we wait here?-Yes,we must./No,we needn't. 4 高中外研版高中语法全解 【基础动词用法】 情态动词系统讲解 考法精析 考法一：情态动词表推测（不同时态) 核心：根据语境判断对现在或过去情况的推测，选择正确的情态动词及结构(must/may/might/can't +动词原形have+过去分词) 真题1（语法填空)： The ground is all wet.It(rain)heavily last night. 答案：must have rained 解析：由”last night'”可知是对过去情况的肯定推测，用'must have+过去分词’结构，rain的过去分 词为rained。 真题2（完形填空）： -Where is Lucy?I can't find her anywhere. -She-be in the library.She often reads there after class. A.must B.may C.can't D.needn't 答案：B 解析：根据”often reads there'”可知是对现在情况的可能性推测，用may+动词原形，意为”可能”。 must表肯定推测语气过于绝对，cant表否定推测，needn't表不必，均不符合语境。 考法二：情态动词表推测与虚拟语气的混合应用 核心：结合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语气，选择正确的情态动词形 式 真题1（语法填空)： The ground is all wet.It_(rain)heavily last night 答案：must have rained 解析：由地面全湿了”这一语境可知是对过去情况的肯定推测，用must have+过去分词，rain的 过去分词为rained。 真题2（单项选择)： If she the exam,she would have called me.But she didn't. A.passed B.had passed C.might pass D.must have passed 答案：B 解析：由”她没有打电话”可知是与过去事实相反的虚拟语气，if从句用had+过去分词，pass的过 去分词为passed。 考法三：情态动词表推测的综合运用 核心：根据语境判断推测的可能性程度及句式要求（肯定句/否定句/疑问句），掌握不同情态动词表 推测的用法区别 真题1（单项选择)： -Where is Tom? 5 高中外研版高中语法全解 【基础动词用法】 情态动词系统讲解 -Hebe in the library.I saw him reading there just now. A must B might C can't D needn't 答案：A 解析：由”我刚才看见他在那儿读书”可知，对汤姆在图书馆的推测可能性极大，u$t表肯定推测 一定，用于肯定句，符合语境。 真题2（语法填空）： The story-(might)be true,but I'm not sure.Let's ask our teacher. 答案：might 解析：根据”但我不确定”可知，对故事真实性的推测可能性较小，ght表推测’可能'，可能性比 may小，符合语境，此处用原形might。 解题小妙招 推测虚拟妙招 推测时态看时间，现在原形过have done: must肯定may might能，can't否定很分明： 虚拟语气看条件，过去事实相反had done: if句用had主句have done,推测虚拟要分清。 真题演练 演练一：单项选择试题（共10题) 1.-Why is the door locked? -He be inside because I heard his voice just now. A.must B.may C.can'tD.needn't 2.Youpark here.It's a no-parking zone. A.needn't B.mustn't C.couldn't D.shouldn't 3.If I you,I would take the job offer immediately. A.am B.was C.were D.be 4.The room is in a mess.Theyhave cleaned it before leaving. A.must B.should C.need D.dare 5.-Could I borrow your dictionary? -Yes,you一，but youreturn it by tomorrow. A.can;must B.may,might C.could;should D.need;have to 6.Shespeak English fluently when she was five. A.can B.could C.may D.might 6 高中外研版高中语法全解 【基础动词用法】 情态动词系统讲解 7.You have told me the truth earlier.Now it's too late. A.must B.should C.would D.might 8.-Is Tom in the office? -He_be there.I saw him go out just now. A.mustn't B.needn't C.can'tD.shouldn't 9.If she harder,she would pass the exam next month. A.study B.studies C.studied D.had studied 10.The bookbe Lucy's-her name is written on the cover. A.must B.may C.might D.can't 演练二：填空试题（共10题) 1.You(not)smoke in the hospital-it's against the rules. 2.IfI (have)enough money,I would buy a new computer. 3.They_have arrived by now,but I'm not sure 4.Shespeak three languages when she was young. 5.You better take an umbrella;it might rain. 6.The ground is dry,so it(not rain)last night. 7.If he(come)tomorrow,we would have a party. 8.You return the book today,you can keep it for another week. 9.He(dare not)tell his parents the truth. 10.The room_(need)cleaning before the guests arrive. 演练三：语法填空试题（共10空) Last Sunday,I planned to meet my friend at the library,but she didn't show up.I waited for an hour and then left.Later,I found out she was ill.She 1.have called me to explain,but she forgot.If she 2. _(tell)me earlier,I 3.(visit)her instead of going to the library. When I got home,my mom asked,"Where were you?You 4.have told me you would be late."I explained everything,and she said,"You 5.(not)worry too much-she's fine now." This morning,I saw a stranger standing outside our house.He looked lost,so I asked if he needed help.He said he 6.find his way to the station.I told him he 7.-take the No.5 bus.He thanked me and left.I thought he 8.have been new to the city. In the afternoon,my teacher asked whyI hadn't finished the homework.I said I 9.-(forget)about it.She said,"You 10.have paid more attention in class."I felt sorry and promised to finish it tonight. 7 高中外研版高中语法全解 【基础动词用法】 情态动词系统讲解 参考答案 演练-：1.A2B3.C4.B5.A6.B7B8.C9.C10.A 1.mustn't 2.had 3.may/might 4.could 5.had 6.can't have rained 7.should/were to come/came 8.needn't 9.dare not 10.needs 1.should 2.had told 3.would have visited 4.should 5.needn't 6.couldn't 7.could/should 8.must 9.had forgotten 10.should P