情态动词 must might couldcant 表推测-2025-2026学年九年级英语全一册语法知识点全解（人教版）

初三全一册人教版 【语法专项突破】 情态动词表推测 语法专版 【专题】情态动词must/might/could/cant 表推测 初中英语语法专项突破 考频分析 初三人教版中，情态动词must/might/could/can't表推测是重点语法模块，考频占词法总量的l5%左 右，贯穿试卷核心题型：单项选择(1-2题)、完形填空(2-3题)、语法填空(1-2题)。在语境理解 类题目中，情态动词表推测的语气强弱及适用场景往往是解题关键。 考查内容 。推测语气强度：ust(肯定推测)、might/could(可能推测)、cam't(否定推测)的语气差异与场景 匹配 ·时态语境适配：must/might//could/can't+动词原形表对现在情沉况的推测，must/might/could/can't+have done表对过去情况的推测 。句式功能辨析：在陈述句中表推测的基本用法，在疑问句中can/could表推测的特殊应用(night/could 可用于疑问句，must/can't一般不用于疑问句表推测) 知识点一：情态动词must/might/could/.can't表推测 1.ust（肯定推测，语气最强，意为”一定；肯定”) 。适用场景：用于肯定句，基于逻辑或证据得出的确定性结论 。例句： 1.The light is on..He must be at home now.(灯亮着，他现在一定在家。) 2.She studies very hard..She must pass the exam.(她学习很努力，肯定能通过考试。) 2.might/could(可能性推测，语气较弱，意为”可能；也许”，could可能性略大于night). 。适用场景：用于肯定句或否定句(might not/could not),表示不确定的推测 。例句： 初三全一册人教版 【语法专项突破】 情态动词表推测 1.He might come to the party tonight,.butI'n not sure.(他今晚可能来参加聚会，但我不确定。) 2.This book could be Mary's.It has her name on it.(这本书可能是玛丽的，上面有她的名字。) 3.cn't（否定推测，语气较强，意为”不可能”) ·适用场景：用于否定句，基于逻辑或证据得出的否定性结论 ·例句： l.He can't speak French.He has never been to France..(他不可能会说法语，他从没去过法国。) 2.The ground is dry.It can't have rained last night.(地面是干的，昨晚不可能下雨了。) 知识点二：情态动词must/might/could/can't表推测 1.must（肯定推测，”一定，肯定”，可能性≥90%) ·用法场景：用于肯定句，对现在/过去的情况进行有把握的推测 ·对现在情况推测：结构：主语+ust+动词原形（状态动词）/be+形容词/名词（动作动词表状 态) ·例句： 1.She must know the answer.(kow是状态动词，用must+原形know,”她一定知道答案。”) 2.The light is on,so he must be at home.(be at home表状态，”灯亮着，所以他一定在家。”) ●对过去情况推测：结构：主语+must have+动词过去分词 ·例句： 1.The ground is wet.It must have rained last night..(”地面湿了，昨晚一定下雨了。”) 2.He looks tired..He must have worked all day.(”他看起来很累，一定工作了一整天。”) 2.might/could(可能性推测，”可能，也许”，might可能性约30o-50%,could约40o60%) 。用法场景：用于肯定句/否定句(might not/.could not),对现在/过去的情况进行不确定推测；could 语气比night稍强 ·对现在情况推测：结构：主语+night//could+动词原形/be+形容词/名词 ·例句： 1.She might come to the party tonight..(”她今晚可能来参加派对。”) 2.This could be the right answer,butI'm not sure.(”这可能是正确答案，但我不确定。”) ●对过去情况推测：结构：主语+might/could have+动词过去分词 ●例句： 1.He isn't here.He might have gone to the library.(”他不在这儿，可能去图书馆了。) 2.You could have told me earlier.(”你本可以早点告诉我的。”，此处could have done也表”本 可以做但未做”，需结合语境区分推测与虚拟) 3.cnt(否定推测，”不可能，一定不”，可能性≤10%) 2 初三全一册人教版 【语法专项突破】 情态动词表推测 。用法场景：用于否定句，对现在/过去的情况进行有把握的否定推测(can表推测仅用于否定句 cnt和疑问句Can..?) ·对现在情况推测：结构：主语+cant+动词原形/be+形容词/名词 ·例句： 1.He can't speak Chinese.He is from America.('他不可能说中文，他来自美国。”) 2.The story can't be true.It's too amazing..(”这个故事不可能是真的，太离奇了。) 。对过去情况推测：结构：主语+can't have+动词过去分词 ·例句： 1.She can't have seen me yesterday..I wasn't there..(”她昨天不可能见过我，我当时不在那儿。 ”) 2.They can't have finished the work in an hour.It's too difficult.(”他们不可能在一小时内完成 这项工作，太难了。”) 4.句式转换与注意事项 ·疑问句推测：用Can.?(”可能…吗？”)，不用nust/night/could ·例句：Can this be your book?(”这可能是你的书吗？”) 。时态一致性：推测过去情况必须用”情态动词+have+过去分词”，不可用’情态动词+动词过 去式 。错误：He must went home.(正确：He must have gone home.) ●语气强弱对比：must（肯定)>can't(否定)>could>might(可能性由强到弱) 知识点三：情态动词must/might/could/can't表推测 1.must（肯定推测，”一定，肯定”) 。基础用法（中考必背）： 1.对现在情况的肯定推测→例句：He must be at home now,because the light is on. 2.对过去情况的肯定推测(must have done)→例句：She must have finished her homework,for she is watching TV. 2.might/could(可能性推测，”可能，也许”，could可能性略大于might) 。基础用法（中考必背）： 1.对现在情沉的可能性推测→例句：It might rain tomorrow,so take an umbrella. 2.对过去情况的可能性推测(might/could have done)一例句：He could have gone to the library, but I'm not sure 3.cant（否定推测，”不可能”) 。基础用法（中考必背）： 3 初三全一册人教版 【语法专项突破】情态动词表推测 1.对现在情况的否定推测→例句：She can't be in the clas room； I saw her leave just now. 2.对过去情况的否定推测(can't have done) →例句：He can't have taken your book； he was n't here yesterday. 考法精析 考法一：情态动词表推测的基本用法辨析 核心：根据语境和推测语气强弱， 选择must/might/could/can't进行正确推测 真题1(单项选择)： The light is off.He beat home now. A must B might C could D can't 答案：D 解析：由”灯关着”这一证据可知， 此处表示否定推测”不可能”， 用can't。must表肯定推测， might 和could表可能性推测， 均不符合语境。 真题2(语法填空)： She studies very hard， so she (pas) the exam. Let's congratulate her in advance 答案：must pass 解析：根据”学习非常努力”这一逻辑， 得出肯定推测”一定能通过考试”， 用must+动词原形， 故 填must pass。 考法二：情态动词表推测的时间与句式综合运用 核心：结合时间状语或上下文语境，判断推测的时间维度(现在/过去/将来)，匹配正确的情态动词 +动词形式结构 真题1(语法填空)： The door is locked. They (go) out for shopping. 答案：must have gone 解析：由”门是锁着的”这一现在状态推测过去动作， 用”must+have+过去分词”结构， go的过去 分词为 gone。 真题2(完形填空)： Listen! Someone (sing) in the next room. Who could it be? A.must sing B.must be singing C.might sing D.might have sung 答案：B 解析：由时间标志词”Listen!”可知动作正在进行， 用”情态动词+be﹢现在分词”的现在进行时推 测结构， must表肯定推测符合语境。 考法三：情态动词must/might/could/can't表推测的综合运用 4 初三全一册人教版 【语法专项突破】 情态动词表推测 核心：结合时间语境判断推测时态（现在过去），根据可能性程度选择合适情态动词，并掌握疑问 句及回答规范 真题1（单项选择)： The ground is dry.It rained last night. A must have B might C can't have D could 答案：C 解析：由'ground is dry”可知对过去情况进行否定推测，结构应为”情态动词+have+过去分词'，cant 表”不可能，符合语境，nust have表肯定推测与dy'矛盾，might/could后缺have,故选C。 真题2（语法填空)： -Where is Lucy?She (be)in the library.I saw her go there just now. -But she (not be)there now.The library closes at 5 pm and it's 6 pm already. 答案：must be;can'tbe 解析：第一空根据”saw her go there'”对现在情况进行肯定推测，用must be;第二空由it's6prm” 和'closes at5pm”可知对现在情况否定推测，用can't be。 解题小妙招 推测用法妙招 推测先看肯否定，否定只能用can't: 肯定推测must强，might could表可能： 时间维度是关键，现在进行be doing: 过去动作看完成，have gone要记牢； must be doing表当前，情态动词加原形： 语境证据来辅助，强弱匹配才正确。 真题演练 演练一：单项选择试题（共10题) 1.The ground is covered with snow.It be very cold outside now. Amust B might C could Dcan't 2.Listen!Someone in the next room.Who could it be? A must sing B must be singing Cmight sing D might have sung 3.Tom have finished his homework,because he is playing basketball now. A must B can't Cmight D could 4.-Where is Lucy? -She be in the library.I saw her there just now. A must B might C can't D could 初三全一册人教版 【语法专项突破】 情态动词表推测 5.You be serious!The exam is tomorrow,and you haven't studied at all Amust B might C can't Dcould 6.The door is locked.They out for a walk. A must go B must have gone Cmight go Dmight have gone 7.This book be Mary's.It has her name on the cover. Amust B might C can't Dcould 8.-Could she the answer? -Yes,she might.She read the textbook yesterday. A know B knows Cknew D to know 9.He speak French when he was five,but now he has forgotten most of it. Amust B can C could Dmight 10.The light is off.They be sleeping now. Amust B can't Cmight Dcould 演练二：填空试题（共10题） 1.The room is clean and tidy.Someone (clean)it just now. 2.You look so tired.You (stay)up late last night. 3.-Is that Mr.Lee? -No,it be him.He has gone to Shanghai. 4.She (not finish)her homework yet.The teacher is still waiting for her. 5.The baby is crying.She(be)hungry. 6.They (play)football on the playground now.Let's go and join them 7.This sweater (be)mine.It's too small for me. 8.You (not park)here.It's a no-parking area. 9.He (study)in the library at this time yesterday. 10.The letter (send)by post,but I'm not sure. 演练三：语法填空试题（共10空） Last Sunday,I went to the park with my friends.When we arrived,we saw a girl crying under a tree.She looked lost,so I thought she (1) (lose)her parents.A kind old man came over and asked,"What's wrong,little girl?"She said she (2) (can't find)her mom.We decided to help her. First,we asked if she (3) (remember)her mother's phone number.She shook her head.Then,one of my friends said,"Her mom (4) (be)worried now.We should take 6 初三全一册人教版 【语法专项突破】 情态动词表推测 her to the park office."When we got there,the office worker said,"A woman called here 10 minutes ago. She said her daughter (5) (wear)a red dress."The girl was wearing a red dress!We (6 (find)her mother soon. Her mother was so happy that she thanked us many times.She said,"I .(7) (look)for her everywhere!I thought I (8) (lose)her forever."I told her,"Don't worry.The girl is smart.She (9) (not go)too far by herself." Later,we continued our walk in the park.My friend said,"Helping others (10)」 (be)a happy thing."I agreed with him. 参考答案 演练-：1.A2B3B4.A5.C6.B7.A8.A9.C10.A 1.must have cleaned 2.must have stayed 3.can't 4.might not have finished 5.must be 6.must be playing 7.can't be 8.mustn't park 9.must have been studying 10.might have been sent 1.must have lost 2.couldn't find 3.could remember 4.must be 5.was wearing 6.must have found 7.have been looking 8.might have lost 9.can't have gone 10.must be 7