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（仁爱版）

9年级仁爱版 【寒假专版】9年级重难点精讲 寒假专版 【语法专题】情态动词系统复习 初中仁爱版9年级 语法精讲 语法概述：情态动词(can,may,must,should,.would等)=表示说话人的语气或态度（如能力、许 可、义务、推测等)，在句中需与动词原形一起构成谓语。 重难点讲解 重难点一：can/could的用法区别及情态动词表推测讲解： can表示“能、会”，强调能力或许可，否定形式can't表示“不能、不可能”；could是can的过去 式，可表示过去的能力，也可用于委婉请求（回答用can)。 He can speak three languages.(能力) Can I borrow your pen?(许可) She could swim when she was five.(过去能力) 情态动词表推测时，can/could用于否定句和疑问句(could语气更委婉)：must用于肯定句表“一 定”；may/might表“可能”(might可能性更低)。 tcan't be true.（否定推测) Could he be at home?(疑间推测) He must be in the classroom.(肯定推测) 真题再现： 1.(2024·湖南长沙期中，仁爱版)一_you swim?一Yes,Ican.AndIswim very fast when I was 8 A.Can;could B.Could;can C.Can;can D.Could;could 答案：A解析：问句询问现在的能力用can;答句“8岁时”表过去能力用could。 2.(2023·湖北武汉月考，仁爱版)一Who is knocking at the door?一It_be Tom.He said he would come. A.can 1 9年级仁爱版 【寒假专版】 9年级重难点精讲 B.must C.may D.might 答案：B解析：根据“他说会来”表肯定推测，用ust“一定”。 重难点二：must/have to的用法区别讲解： must强调主观上“必须”，否定形式mustn't表“禁止”；have to强调客观上“不得不”，有人称和 时态变化(has to/had to),否定形式don't have to表“不必”。 You must finish your homework first.(主观要求) It's raining.I have to take an umbrella.(客观需要) You mustn't smoke here.(禁止) You don't have to come early tomorrow.(不必) 真题再现： 1.(2024·广东广州期末，仁爱版)—Do we_wear uniforms at school?-Yes,it's the school rule. A.must B.have to C.can D.may 答案：B解析：“学校规定”是客观要求，用have to,must不能用于疑问句。 2.(2023·江西南昌期中，仁爱版)Youplay with fire.It's dangerous! A.must B.mustn't C.have to D.don't have to 答案：B解析：“玩火危险”表禁止，用mustn't。 重难点三：情态动词should /had better的用法讲解： should表“应该”，强调责任或建议，否定形式shouldn't表“不应该”；had better表“最好做某 事”，否定形式had better not,.语气比should更强，常缩写为'd better。 You should respect your parents..(责任) She should see a doctor..(建议) You'd better not go out alone at night.(劝告) 真题再现： 1.(2024·四川成都月考，仁爱版)一I have a headache.一Youlie down and have a rest. A.should B.must 2 9年级仁爱版 【寒假专版】 9年级重难点精讲 C.can D.will 答案：A解析：根据“头痛”提出建议，用should“应该”。 2.(2023·浙江杭州期末，仁爱版)It's getting late.You_better take a taxi home. A.have B.had C.would D.will 答案：B 解析：had better是固定搭配，表“最好…”。 重难点四：情态动词need的用法讲解： need作情态动词时，用于否定句和疑问句，表“需要”，否定形式needn't表“不必”：作实义动词 时，有人称和时态变化，后接todo,否定形式借助don't/doesn't/didn't。 一Need I finish it today?一No,you needn't.(情态动词) You don't need to worry about me.(实义动词) 真题再现： 1.(2024·江苏南京期中，仁爱版)一Must I hand in my report now?一No,you一.You can do it tomorrow. A.mustn't B.needn't C.can't D.shouldn't 答案：B解析：must引导的一般疑问句否定回答用needn't“不必”。 2.(2023·安徽合肥期末，仁爱版)Sheto buy some milk.There's none left in the fridge A.need B.needs C.needed D.needing 答案：B解析：need在此处作实义动词，主语是第三人称单数，用needs to do。 易错点综合演练 I单项选择（直击重难点） 1.-you speak Japanese?I need someone to help the foreign guests. A.Can B.Must 3 9年级仁爱版 【寒假专版】 9年级重难点精讲 C.Should D.Need 2.-What a nice smell!Is it cookies?-It be!My mom is making them in the kitchen. A.can B.must C.may D.might 3.We_wear masks in crowded places during the pandemic.It was a rule. A.must B.hadto C.could D.should 4.-Must I return the book before Friday?-No,you.You can keep it for a week. A.mustn't B.needn't C.can't D.shouldn't Ⅱ.用所给词的适当形式填空（强化句型结构） 1.You_(not play)computer games too late.It's bad for your eyes 2.She(can)swim very well when she was ten years old. 3.we(take)umbrellas?The weather report says it might rain. 4.You (have to)come to school early tomorrow-there's a test at 8:00. 血，短文填空（综合运用情态动词） 用can/could/must/have to/should/need的适当形式填空，使短文完整通顺。 Tom:Mom,I go to the party tonight? Mom:No,you_.You finish your homework first. Tom:But I finish it in an hour! Mom:Then you-come back before 10 p.m.It's late. Tom:OK!And_you drive me there?My bike is broken. Mom:Sure,but we_leave at 7:30 V.按要求改写句子（巩固否定、疑问句式） 1.He must finish the work today..（改为否定句) 9年级仁爱版 【寒假专版】9年级重难点精讲 2.They have to take the bus because their car is broken.(改为一般疑间句并作肯定回答) 3.You should tell him the truth.(对划线部分提问) 4.She can speak French and German..(改为否定句) 参考答案 I.单项选择：1.A2B3.B4.B Ⅱ.用所给词的适当形式填空： 1.shouldn't play 2.could 3.Should;take 4.will have to Ⅱ.短文填空： 1.can 2.can't 3.must 4.can 5.have to 6.could 7.have to V.按要求改写句子： 1.He needn't finish the work today. 2.Do they have to take the bus because their car is broken?Yes,they do. 3.What should I do? 4.She can't speak French or German.