情态动词系统复习-2025-2026学年九年级英语下册语法重难点精讲（外研版）

9年级外研版 【语法专版】 情态动词系统复习 语法专版 【语法专题】情态动词系统复习 初中外研版九年级 语法精讲 语法概述：情态动词(can,could,may,might,must,should,will,would,need,had better等)=表示 说话人的语气或情态（如能力、许可、推测、义务等），在句中不能单独作谓语，需与动词原形一 起构成谓语。 重难点讲解 重难点一：情态动词can/could的用法区别讲解： cn表示现在的能力，意为”能、会”，也可用于请求或许可（口语中常用），否定形式为can't。 I can speak English fluently.(能力) Can I borrow your pen?(请求) could是can的过去式，可表示过去的能力，也可用于委婉请求（此时could无过去含义），否定 形式为couldn't。 She could swim when she was five.(过去能力) Could you please open the window?(委婉请求) 真题再现： 1.(2024北京海淀期中，外研版)一_you play the piano?一Yes,Ican.I started learning it three years ago A.Can B.Could C.Must D.Should 答案：A解析：答句用can回应，问句询问现在的能力，用Cn。 2.(2023四川成都月考，外研版)My grandfather_walk fast when he was young,but now he can't. A.can B.could C.must D.should 9年级外研版 【语法专版】 情态动词系统复习 答案：B解析：when he was young表示过去时间，用could表示过去的能力。 重难点二：情态动词mnay/might的用法区别讲解： may表示”可以”（许可）或可能”（推测），否定形式为may not(可能不)，疑问句中表示请求 许可时，肯定回答用Yes,you may/Yes,please,否定回答用No,you mustn't/No,you can't。 You may leave the classroom now.(许可) It may rain tomorrow.(推测) might是may的过去式，可表示过去的许可或可能性，也可表示现在的可能性（语气比may更 弱)。 She said I might use her dictionary.(过去许可) He might be at home now.(现在推测，可能性小) 真题再现： 1.(2024江苏南京期末，外研版)一I use your dictionary?I left mine at home.一Yes,you may. A.Must B.Should C.May D.Need 答案：C解析：根据语境表示请求许可，用May。 2.(2023浙江杭州期中，外研版)一Where is Tom?一He_be in the library.I saw him there just now. A.may B.might C.must D.can 答案：A解析：just now表示有一定依据的推测，用may可能性比might大。 重难点三：情态动词must/have to的用法区别讲解： must表示'必须”（主观意愿），否定形式为mustn't(禁止)，疑问句否定回答用needn't/don't have to(不必)。 You must finish your homework before dinner..(主观要求) You mustn't park here.(禁止) have to表示”不得不”（客观需要），有人称、数和时态的变化(has to/had to/will have to),否定形 式为don't have to(不必)。 I have to wear glasses because I can't see clearly.(客观需求) She had to stay at home yesterday because she was ill.(过去时) 2 9年级外研版 【语法专版】 情态动词系统复习 真题再现： 1.(2024广东广州月考，外研版)一Must I return the book today?-No,you一.You can keep it for another three days. A.mustn't B.needn't C.can't D.shouldn't 答案：B解析：must引导的疑问句否定回答用needn't表示”不必”。 2.(2023湖北武汉期末，外研版)My brother_get up early every morning because he has to catch the early bus to school. A.must B.has to C.may D.can 答案：B 解析：because引导的客观原因，用has to表示”不得不'。 重难点四：情态动词should/ought to的用法讲解： should表示”应该'（建议、责任或义务），否定形式为shouldn't,ought to与should用法基本相同， 但语气稍强，否定形式为ought not to。 You should listen to your parents'advice.( We ought to help each other.(义务) 真题再现： 1.(2024山东青岛期中，外研版)You be quiet in the library.It's a rule. A.should B.can C.may D.will 答案：A解析：根据语境表示”应该遵守规则，用should。 2.(2023河北石家庄月考，外研版)一What I do to improvemy English?一You shouldread English newspapers every day. A.must B.should C.may D.could 答案：B解析：问句询问建议，用should: 3 9年级外研版 【语法专版】 情态动词系统复习 重难点五：情态动词表推测的用法讲解： must表示”一定、肯定”（用于肯定句，可能性极高），can't表示”不可能”（用于否定句），may/might 表示”可能”（用于肯定句或否定句，可能性依次减弱）。 He must be at school now.(肯定推测) That can't be Lucy.She has gone to Beijing..(否定推测) It may rain this afternoon,butI'm not sure.（可能性推测) 真题再现： 1.(2024天津和平区期末，外研版)The light in his room is on,.sohe_be at home. A.must B.can't C.may D.might 答案：A 解析：灯亮着是肯定依据，用ust表示”一定在家”。 2.(2023山西太原期中，外研版)一Is that Mr.Li?一It_be him.He has gone to Shanghai on business. A.must B.can't C.may D.might 答案：B 解析：has gone to表示人不在此处，用cn't表示'不可能”。 易错点综合演练 L单项选择（直击重难点） 1.-you swim across the river when you were ten? -No,but now I can. A.Can B.Could C.Must D.Should 2.You_park here.There's a"No Parking"sign. A.mustn't B.needn't C.may not D.couldn't 3.My brother_wear glasses because he has poor eyesight. 9年级外研版 【语法专版】 情态动词系统复习 A.must B.hasto C.may D.can 4.-Where is Amy? -She be in the classroom.I saw her reading there five minutes ago. A.must B.can't C.may D.might Ⅱ.用所给词的适当形式填空（强化句型结构） 1.He(can)play the violin very well when he was six years old 2.You(should)eat too much junk food.It's bad for your health 3.we(must)finish the project today? 4.There_(may)be a heavy rain this evening,so take an umbrella 5.My father(have to)work overtime yesterday because of the deadline. Ⅱ短文填空（综合运用情态动词） 用括号内情态动词的适当形式填空，使短文完整通顺。 Tom is a middle school student.He 1.(can)speak three languages:Chinese,English and French. His mother often tells him he 2.(should)study harder,but he sometimes forgets.Last week,he 3. -(could)not finish his homework on time,so his teacher asked him to stay after class.Tom felt sorry and promised he 4.-(must)plan his time better.Tomorrow is Saturday,and he 5.-(may)go to the library to study instead of playing video games. V.连词成句（聚焦句型结构） 1.you could /please/the door open / 2.mustn't/in the hospital /we/loudly /talk/. 3.he/might/late /be/because/traffic the heavy/. 4.should what/I/do/to/my English improve/? 5.can't that /be Mary she /has/to /Beijing gone/. V.按要求改写句子（巩固否定、疑问句式） 5 9年级外研版 【语法专版】 情态动词系统复习 l.They must finish the work before Friday.(改为否定句) 2.You should take this medicine twice a day..(改为一般疑问句并作肯定回答) 3.HIe may be at home now.(改为同义句) 4.She can speak Japanese fluently.（对划线部分提问) 综合演练参考答案 I.单项选择：1B2.A3.B4.C Ⅱ.用所给词的适当形式填空：1.could2.shouldn't3.Must,finish4.may5.had to Ⅲ短文填空： 1.can 2.should 3.could 4.must 5.may V.连词成句： 1.Could you please open the door? 2.We mustn't talk loudly in the hospital. 3.He might be late because the traffic is heavy. 4.What should I do to improve my English? 5.That can't be Mary.She has gone to Beijing V按要求改写句子： 1.They needn't finish the work before Friday.They don't have to finish the work before Friday.) 2.Should I take this medicine twice a day?Yes,you should. 3.Maybe he is at home now.He might be at home now.) 4.What language can she speak fluently? 6