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易错点精讲（沪外版）

初中沪外版 【寒假专版】 9年级语法精讲 寒假专版 情态动词综合专项训练 寒假语法易错点精讲 学段：初中教材：沪外版 年级：9年级 语法认知 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。 易错点讲解 易错点一：混淆情态动词表推测的时态用法 讲解： 情态动词表推测时，must用于肯定句表“一定”，can/could用于否定句和疑问句表“可能”：对现 在/将来推测用“情态动词+动词原形”，对过去推测用“情态动词+have+过去分词”。 例句：He must be at home now.(现在推测)→He must have finished his homework.(过去推测) 真题再现： 1.(2024上海浦东期中，沪外版)-Where is Lucy?一She_be in the library..I saw her go there just now. Amust B can Cmay Dneed 答案：A解析：根据“saw her go there”可知表肯定推测，用must“一定”。 2.(2024浙江杭州月考，沪外版)He_have passed the exam,because he looks so sad, A mustn't B can't Cneedn't D shouldn't 答案：B解析：由“looks sad'”可知是否定推测，用can't have done表“不可能做过”。 易错点二：情态动词表义务与建议的混淆 1 初中沪外版 【寒假专版】 9年级语法精讲 讲解： must表“必须”（主观义务），have to表“不得不”（客观要求）；should表“应该”（建议），had better表“最好”（更强烈建议），语气由强到弱：must>-should-had better。 例句：You must obey the rules.(主观义务)→You have to go to school on time.(客观要求) 真题再现： 1.(2023江苏南京期末，沪外版)一_we clean the classroom now?-No,you needn't.You can do it after school. A Must B Can C Should D May 答案：A解析：由答语needn't可知问句用must表“必须”，符合沪外版教材语法体系。 2.(2023安徽合肥期中，沪外版)You_take an umbrella..It's going to rain A should B must C would Dwill 答案：A解析：根据“going to rain”表建议，用should“应该”，语气较委婉。 易错点三：情态动词+have done的否定形式错误 讲解： must表推测时否定用can't have done,不用mustn't have done:shouldn't have done表“本不应该 做却做了”，needn't have done表“本不必做却做了”。 例句：You shouldn't have lied to your parents.(本不该撒谎)→You needn't have bought so much food.. (本不必买) 真题再现： 1.(2024湖北武汉月考，沪外版)一I called you last night,.but no one answered.I_have been sleeping.I didn't hear anything. A must B can C should Dneed 答案：A解析：表对过去的肯定推测，用must have been sleeping“一定在睡觉”。 2.(2023福建厦门期末，沪外版)She_have told me the news earlier..I missed the important meeting. A should B must Cneed Dcan 答案：A解析：表“本应该做却没做”，用should have told“本应该告诉”。 易错点四：情态动词与动词原形的搭配错误 讲解： 情态动词后必须接动词原形，不可接todo或动名词；can/could/may/might表能力或许可时，同样 遵循“情态动词+动词原形”规则。 2 初中沪外版 【寒假专版】 9年级语法精讲 例句：He can speak English well.(正确)→Ie can to speak English well..(错误) 真题再现： 1.(2024广东广州期中，沪外版)一_you swim when you were five?-Yes,I could. A Can B Could CMay D Must 答案：B解析：根据“were five”可知用过去式could,后接动词原形swim。 2.(2023江西南昌月考，沪外版)You must_attention to the traffic lights when crossing the road.. A pay B pays Cto pay D paying 答案：A解析：must后接动词原形pay,pay attention to为固定搭配。 易错点综合演练 综合演练 I单项选择（直击易错点) 1.-Why is Tom absent today? -He be ill.His mother called the teacher this morning A must B can Cmay Dneed 2.You_return the book to the library on time,or you'll be fined. A must B can Cmay Dneed 3.She looks upset.Shehave failed the test A mustn't B can't C shouldn't Dneedn't 4.You-play with fire.It's dangerous. A mustn't B needn't C shouldn't D can't Ⅱ.用所给词的适当形式填空（强化易错点区分） 1.He_(must)have left his keys at home,because the door is locked. 2.We(should)help the elderly cross the street 3.You _(need)have bought so many apples.We still have some. 4.They_(can)swim when they were young. IIⅡ.短文填空（综合运用四大易错点） 用适当的情态动词填空： 3 初中沪外版 【寒假专版】 9年级语法精讲 Yesterday,I saw Lily crying.She told me she didn't pass the math exam.I thought she 1.(must)have studied hard,but maybe she was too nervous.Her mother said she 2.(should)have prepared better.I told her she 3._ (needn't)worry too much.She 4.-(can)ask the teacher for help. .连词成句（聚焦易错句式） 1.must,he,have,finished,homework,his ( 2.should,we,follow,the,rules(.) 3.can't,they,have,arrived,already (. 4.could,you,ride,a,bike,when,you,were,six (? 参考答案 I.单项选择 1.A2.A3.C4.A Ⅱ.用所给词的适当形式填空 1.must 2.should 3.needn't 4.could II短文填空 1.must 2.should 3.needn't 4.can V.连词成句 1.He must have finished his homework. 2.We should follow the rules. 3.They can't have arrived already. 4.Could you ride a bike when you were six?