情态动词can may must should-2025-2026学年七年级英语下册语法重难点精讲（北师大版）

7下（新）北师大版 【语法专版】 重难点精讲 语法专版 【语法专题】情态动词 can/may/must/should专项突破 初中北师大版七年级下册 语法精讲 语法概述：情态动词can/may/must/should是表示说话人语气或态度的动词，不能单独作谓语，需 和动词原形一起使用，在句中可表示能力、许可、必须、义务等。 一、 重难点讲解 重难点一：can/may/must/should的基本含义及用法区别讲解： can表示”能、会”（能力）或”可以”（许可，口语中常用），否定形式can't表示”不能、不允许”。 I can speak English.（能力) Can I borrow your pen?(许可) may表示，可以”（正式许可）或”可能？（推测），否定形式may not表示”不可以'，语气比cant 委婉。 You may leave the room now.(许可) It may rain tomorrow.(推测) must表示”必须、一定”（主观义务或肯定推测)，否定形式mustn't表示禁止”，语气强烈。 We must follow the school rules.(义务) She must be at home now.(推测) should表示”应该”（建议、责任或义务），否定形式shouldn't表示”不应该”。 You should study hard.(建议) He shouldn't eat too much junk food..(责任) 真题再现： 1.(2024 北京海淀期末，北师大版)一_you swim?一Yes,Ican.It's easy for me. A.May B.Must C.Can 7下（新）北师大版 【语法专版】 重难点精讲 D.Should 答案：C 解析：答句用can回应，问句询问能力，用Can。 2.（2023 陕西西安月考，北师大版)You be quiet in the library. A.may B.must C.can D.should 答案：B 解析：图书馆需要保持安静是必须遵守的规则，用ust表示主观义务。 重难点二：情态动词的疑问及否定结构讲解： 疑问结构：情态动词+主语+动词原形+其他？ Can he play basketball? Must we finish homework today? 否定结构：主语+情态动词+not+动词原形+其他？ She can't ride a bike. You shouldn't be late again. 注意：may的否定回答常用No,you can't/mustn't:nust的否定回答常用No,you needn'/don't have to。 -May I go out?-No,you can't. -Must I clean the room now?-No,you needn't. 真题再现： 1.(2024广东深圳期中，北师大版)一I use your dictionary?一Sory,I'm using it now. A.Must B.Should C.May D.Can 答案：C 解析：请求使用物品用May表示委婉许可，符合语境。 2.(2023江苏南京期末，北师大版)You_play computer games too long.It's bad for your eyes.. A.mustn't B.shouldn't C.can't D.may not 答案：B解析：建议不要长时间玩游戏，用shouldn't表示不应该。 2 7下（新）北师大版 【语法专版】 重难点精讲 重难点三：情态动词表推测的用法讲解： must用于肯定句表示，一定、肯定”（可能性极高），cnt用于否定句表示”不可能”（可能性极 低)，may/might用于肯定句或否定句表示”可能”（可能性一般）。 The light is on.He must be in the room.(肯定推测) It can't be a cat.It's too big..(否定推测) She may come to the party tonight..(不确定推测) should表示”按道理应该”，暗含期待或预测。 They should arrive here at5pm.(预测) 真题再现： 1.(2024浙江杭州月考，北师大版)一Who is singing in the next room?-It_be Lucy..Shel1ikes singing very much. A.must B.may C.can D.should 答案：A解析：根据”她非常喜欢唱歌的信息，推测极有可能是Lucy,用ust。 2.（2023 四川成都期末，北师大版)It's raining heavily.You一take an umbrella. A.must B.should C.can D.may 答案：B解析：根据”雨下得很大”的情况，建议带伞，用should表示按道理应该做的事。 易错点综合演练 I单项选择（直击重难点)》 1.-you speak French?I need someone to help with translation. A.May B.Must C.Can D.Should 2.You run in the hallway.It's dangerous. A.mustn't B.shouldn't 3 7下（新）北师大版 【语法专版】 重难点精讲 C.can't D.may not 3.The girl in red be Lucy.She told me she would wear a blue dress today. A.must B.may C.can't D.should 4.-I borrow your history notes?I was absent yesterday. A.Must B.Should C.May D.Can Ⅱ.用所给词的适当形式填空（强化句型结构） 1.You (not eat)in the classroom.The teacher will be angry. 2.He(must)finish his homework before watching TV. 3.they(may)leave early today? 4.She (should)be more careful with her things. 5.The movie(can)start at 7 pm,but I'm not sure. Ⅱ，短文填空（综合运用情态动词） 用can/may/must/.should的适当形式填空，使短文完整通顺。 Dear students,welcome to our school library!Here are some rules you need to follow.First,you 1. speak loudly here.It will disturb others.Second,you 2.return books on time.If you can't,you 3. ask the librarian for extension.Third,you 4.eat or drink in the reading area.Fourth,you 5.take care of the books.If they are damaged,you 6.pay for them.Finally,you 7.ask the staff for help if you need any. V.连词成句（聚焦句型结构） 1.can,swim,you,fast,very,(? 2.must,we,rules,the,follow,school,(. 3.may,I,your,use,ruler,(? 7下（新）北师大版 【语法专版】 重难点精讲 4.should,he,more,exercise,take,( 5.can't,you,here,smoke,( V.按要求改写句子（巩固否定、疑问句式） 1.We must wear uniforms at school.(改为否定句) 2.She can play the piano well..(改为一般疑问句并作肯定回答) 3.They should finish the work today..(对划线部分提问) 4.May I open the window?(作否定回答) 参考答案 I单项选择：1.C2.A3.C4.C Ⅱ.用所给词的适当形式填空：1.mustn'teat2.must3.May,leave4.should5.may Ⅲ短文填空： 1.can't 2.must 3.may 4.mustn't 5.should 6.must 7.can IV.连词成句： 1.Can you swim very fast? 2.We must follow the school rules. 3.May I use your ruler? 4.He should take more exercise. 5.You can't smoke here. 5 7下（新）北师大版 【语法专版】 重难点精讲 V.按要求改写句子： 1.We mustn't wear uniforms at school. 2.Can she play the piano well?Yes,she can. 3.When should they finish the work? 4.No,you can't/mustn't. 6