情态动词综合推测义务建议等-2025-2026学年九年级英语下册语法重难点精讲（沪外版）

9年级沪外版 【寒假专版】 D版重难点精讲 寒假专版 【语法专题】情态动词综合专项突破 初中沪外版9年级 语法精讲 语法概述：情态动词综合（推测、义务、建议等）=表达推测（可能、一定等）、义务（必须、应 该等)、建议（最好、可以等）等语气的动词，在句中与动词原形一起构成谓语，表示说话人的情 感或态度。 一、 重难点讲解 重难点一：情态动词表推测的用法及区别讲解： 情态动词must,may/might,can/could可表推测，语气由强到弱依次为must（一定)>may/might (可能)>can/could(可能，否定推测表”不可能)。 -must用于肯定句，表”一定、肯定”，基于事实或逻辑推断： She must be at home-her bike is outside. -may/might用于肯定句或否定句(might语气更弱)，表”可能、也许'： It may rain tomorrow,so take an umbrella. -can/could用于否定句(can't/couldn't,表”不可能”)或疑问句（表推测）： He can'i be in the classroom-I saw him leave school. 真题再现： 1.(2023上海徐汇区期中)一Who is knocking at the door? -Itbe Tom.He said he would come at 7 p.m. A.must B.may C.can't D.need 答案：A解析：根据”他说七点会来”的事实推断，敲门的”一定”是汤姆，用ust。 2.(2024上海浦东期末)The girl in red_be Lucy-Lucy is wearing a blue dress today. A.must B.might C.can't D.could 9年级沪外版 【寒假专版】 D版重难点精讲 答案：C解析：由露西今天穿蓝裙子，可知，穿红衣服的女孩'不可能”是她，用can't。 重难点二：情态动词表义务/责任(nust,have to,.should/,ought to)讲解： must表主观义务，意为”必须、应该”，否定式mustn't表禁止”： You must follow the school rules. -have to表客观需要，意为”不得不'，有人称和时态变化(has to/had to): I have to finish my homework before dinner. -should/ought to表建议或责任，意为”应该”，ought to语气稍强，否定式为shouldn't/ought not to: You should apologize for being late. 真题再现： 1.(2023上海闵行月考)一_I return the book to the library today? -No,you don't have to.You can keep it for two weeks. A.Must B.Should C.Can D.May 答案：A 解析：由答句”不必”可知，问句表”必须”，用ust提问。 2.(2024 上海虹口期中)We_wear masks in crowded places during the epidemic. A.can B.might C.have to D.would 答案：C 解析：疫情期间在人群密集处戴口罩是”客观需要”，用have to。 重难点三：情态动词表建议/请求(can/could,nay/night,shall) 讲解： -can/could表请求许可，could语气更委婉； Could you please pass me the pen? -may/might表请求或允许，might更委婉： May I leave the classroom early? -shal用于第一、三人称疑问句，表征求对方意见： Shall we go for a walk after dinner? 真题再现： 1.(2023上海静安期末)一_we go to the museum this weekend? -Good idea!I hear there's a new exhibition. A.Must B.Shall 2 9年级沪外版 【寒假专版】 D版重难点精讲 C.Would D.Need 答案：B 解析：问句表征求意见”我们周末去博物馆好吗？”，用shal。 2.（2024上海杨浦月考)一_I use your dictionary for a minute? -Sure,here you are. A.Must B.Should C.Could D.Will 答案：C解析：请求借用词典，用委婉语气could。. 重难点四：情态动词的否定式及特殊用法讲解： -need可作情态动词（仅用于否定/疑问句）或实义动词，否定式needn't表'不必'； 6 u needn't come early tomorro(情态动词) He needs to finish the work today,.（实义动词) -had better表建议，意为'最好'，否定式had better not; You had better not stay up late. 真题再现： 1.(2023 上海长宁期中)一Must I hand in the report now? -No,you.You can do it tomorrow. A.mustn't B.needn't C.can't D.shouldn't 答案：B解析：must提问的否定回答用needn't(不必)，而非nustn't(禁止)。 2.(2024上海普陀期末)You_better take an umbrella—it looks like rain. A.had B.would C.should D.might 答案：A解析：固定搭配had better,表”最好带伞”。 3 9年级沪外版 【寒假专版】 D版重难点精讲 易错点综合演练 I. 单项选择(直击重难点) 1.—Where is Lucy?I can't find her. She be in the library. She often reads thereafter school. A.must B.may C.can't D.need 2.—I use your mobile phone to call my mother? —Sure， here you are. A.Must B.Should C.Could D.Will 3.You wear a helmet when riding an electric bike. It's the traffic rule A.can B.might C.have to D.would 4.—Must we hand in the project before Friday? —No， you . You can give it to me next Monday. A A.must n't B.need n't C.can't D.should n't .用所给词的适当形式填空(强化句型结构) 1.He (not be) at home now. I saw him go out ten minutes ago. (提示：用情态动词表推测) 2.You (finish) your homework before watching TV.Its better for your study. (提示：用 should/ought to) 3.we (go) to the park this Sunday? I want to have a picnic there.(提示：用shall表征求意见) 4.She (not park) her car here. There'sa”No Parking”sign.(提示：用must n't) .短文填空(综合运用情态动词) 用must， may， can， should， have to 的适当形式填空， 使短文完整通顺。 To mis a student in Grade 9.He 1.getup early every day because his school startsat 7：30am.He 2. 4 9年级沪外版 【寒假专版】 D版重难点精讲 arrive late,or he will be punished by the teacher.Tom likes reading,so he 3.go to the library after school.Sometimes he 4.stay there until 6 p.m.His mother often tells him,"You 5.read too late at night.It's bad for your eyes."Tom knows he 6.follow his mother's advice.He thinks he 7.be a good student if he tries his best. V.连词成句（聚焦句型结构） 1.must,we,rules,school,follow,the,( 2.be,he,in,can't,room,his,now,( 3.I,borrow,your,may,dictionary,(? 4.had,better,you,early,to,go,bed,( V.按要求改写句子（巩固情态动词用法） l.He must finish his work today.(改为否定句) 2.You should tell him the truth.(改为一般疑问句并作肯定回答) 3.She may be at home.(对划线部分提问) 4.We have to wear uniforms at school.(改为同义句) 综合演练参考答案 I.单项选择：1B2.C3.C4B Ⅱ.用所给词的适当形式填空： 1.can't be 2.should finish ought to finish 3.Shall;go 4.mustn't park Ⅲ短文填空： 1.has to 2.mustn't 3.may 4.can 5.shouldn't 6.should 7.can 5 9年级沪外版 【寒假专版】D版重难点精讲 V.连词成句： 1.We must follow the school rules. 2.He can't be in his room now. 3.May I borrow your dictionary? 4.You had better go to bed early. V按要求改写句子： 1.He needn't finish his work today. 2.Should I tell him the truth?Yes,you should. 3.Where may she be? 4.We must wear uniforms at school. 6