情态动词have done表过去推测-2025-2026学年八年级英语下册语法重难点精讲（鲁教版五四制）

8下鲁教版（五四制） 【语法精讲】 情态动词过去推测专题 语法专题 【语法专题】情态动词+have done表过去 推测专项突破 初中鲁教版（五四制）八年级下册 语法精讲 语法概述：情态动词+have done表过去推测=情态动词(must,may,might,could,can't等)+have +动词过去分词，用于对过去发生的事情进行推测。 重难点讲解 重难点一：不同情态动词表过去推测的含义区别讲解： must have done表示对过去事情的肯定推测，意为“一定做过某事”，只用于肯定句；can’t/couldn' t have done表示对过去事情的否定推测，意为“不可能做过某事”；may/might have done表示对过 去事情的可能性推测，意为“可能/或许做过某事”，might可能性比may更小，可用于肯定句或 否定句(may not have done意为“可能没做过”)。 例句： She must have finished her homework,for she is watching TV now. He can't have taken your book-he never comes into your room. They might have arrived late because of the heavy rain. 真题再现： l.(2024山东青岛期末，鲁教版)一Why didn’t Tom attend the meeting yesterday?-He_ill, because he never misses important meetings. A.must be B.must have been C.can be D.can have been 答案：B解析：根据“yesterday”可知是对过去情况的推测，且“never misses important meet- ings”表肯定推测，用must have been。 2.(2023山东济南期中，鲁教版)The ground is dry,soit_rained last night. A.must have 1 8下鲁教版（五四制） 【语法精讲】 情态动词过去推测专题 B.can't have C.may have D.might have 答案：B解析：“地面是干的”表否定推测，意为“昨晚不可能下雨”，用can’thave rained。 重难点二：情态动词表过去推测的句式结构及人称一致性讲解： 所有表过去推测的结构均为“情态动词+have+过去分词”，不随主语人称或数变化；否定形式 直接在情态动词后加not(must否定用can't/couldn’t,不用mustn’thave done)。 例句： It may not have snowed in the south last winter. Could they have left without saying goodbye? 真题再现： l.(2024山东烟台月考，鲁教版)-Where is Lucy?She was supposed to be here an hour ago. She lost her way.Let's call her. A.might have B.must have C.can have D.should have 答案：A解析：对过去情况的可能性推测，且无肯定依据，用might have lost。 2.(2023山东威海期末，鲁教版)You_told me the truth earlier.Now it's too late to fix the problem. A.must have B.should have C.can have D.may have 答案：B解析：should have done表“本应该做但未做”，此处符合“本应早点告诉我真相” 的语境。 重难点三：must have done与should have done的易混辨析讲解： must have done表“过去一定做了某事”（推测）；should have done表“过去本应该做某事但未 做”（责备或建议），否定形式should not have done表“本不应该做但做了”。 例句： You should have reviewed the lesson before the exam. He must have reviewed the lesson,for he got full marks. 2 8下鲁教版（五四制） 【语法精讲】 情态动词过去推测专题 真题再现： 1.(2024山东淄博期中，鲁教版)一I failed the math test again.一You practiced more problems. It's your own fault A.must have B.should have C.could have D.might have 答案：B解析：根据“failed”和“fault”可知是责备“本应多做题但未做”，用should have practiced。 2.(2023山东临沂期末，鲁教版)The door was unlocked.He forgotten to lock it when he left A.must have B.should have C.need have D.would have 答案：A解析：“门没锁”是过去事实，推测“他一定忘了锁门”，用must have forgotten 重难点四：情态动词表过去推测的反意疑问句讲解： 反意疑问句的助动词由情态动词后的实际时态决定（即“have done'”中的done对应的时态），若 句中有明确过去时间状语，用did:若无，用have/has。. 例句： He must have finished the work yesterday,didn't he? They may have lived here for years,haven't they? 真题再现： 1.(2024山东东营月考，鲁教版)She must have returned home,_she? A.didn’t B.hasn’t C.isn't D.wasn't 答案：B解析：句中无明确过去时间状语，“have returned”表完成时，反意疑问句用hasm' to 2.(2023 山东潍坊期末，鲁教版)He can't have watched TV last night,._he? A.did B.has C.was D.is 答案：A 解析：“last night”表过去，“watched”对应过去时，反意疑问句用did。 3 8下鲁教版（五四制） 【语法精讲】 情态动词过去推测专题 易错点综合演练 L单项选择（直击重难点） 1.-Why didn't you answer my call last night? -I asleep.I went to bed early because I was tired. A.must be B.must have been C.can be D.should have been 2.The light in his room is off,so he out. A.must have gone B.can have gone C.may have gone D.should have gone 3.-Where is my notebook?I can't find it anywhere. -You left it in the classroom.Let's go and check A.must have B.should have C.can have D.may have 4.You told me about the party earlier.I missed it because I didn't know. A.must have B.should have C.can have D.may have Ⅱ.用所给词的适当形式填空（强化句型结构） 1.He(finish)his homework an hour ago,for he is playing games now.must have done) 2.The room is empty.They(leave)already.(用can'thave done形式) 3.she_(arrive)at the station on time?I'm not sure.(用may have done形式) 4.You (not eat)so much junk food.It's bad for your health.should not have done) 5.They(go)to the park yesterday,but I'm not certain.might have done) Ⅱ短文填空（综合运用过去推测） 用括号内情态动词的适当形式填空，使短文完整通顺。 Yesterday was Sunday.Tom didn't come to my birthday party.I wonder why.He 1.(forget)the 4 8下鲁教版（五四制） 【语法精讲】 情态动词过去推测专题 date,because I told him about it three days ago.Or he 2.(be)ill,but he didn't tell me.His friend said he was at home all day.He 3.(watch)TV and forgot the time.I think he 4.(apologize)to me today.If he didn't come,he 5.(have)a good reason V.按要求改写句子（巩固否定、疑问句式） l.He must have finished the work.(改为否定句) 2.They may have seen the movie..(改为一般疑问句) 3.She should have told me the truth.(对划线部分提问，划线部分：told me the truth) 4.The ground is wet,so it must have rained last night..(改为反意疑问句) 参考答案 (答案待补充) 5