选修1 虚拟语气if从句对现在过去事实的虚拟用法-备战2025-2026学年高中英语上学期期末语法全解（沪教版）

ENGLISH-选修1系列资料（沪教版） Chapter2虚拟语气 考频分析 虚拟语气是高中英语语法的重要模块，考频占语法总量的5%左右，主要分布在核心题型：单项选择1题、 完形填空1-2题、语法填空1题。在语境理解类题目中，f从句对现在、过去事实的虚拟用法是解题关键， 需重点掌握从句与主句的时态对应规则。 考查内容 高中英语对虚拟语气(f从句对现在、过去事实的虚拟用法)的考察聚焦两大维度，覆盖基础结构与语境 应用： ·对现在事实虚拟：if从句谓语动词用一般过去时(be动词用were),主句用would/could/might/.should+ 动词原形的结构识别与应用； ·对过去事实虚拟：if从句谓语动词用had+过去分词，主句用would/could/might/should+have+过去 分词的结构识别与应用。 精讲精练 知识点一：虚拟语气(f从句对现在、过去事实的虚拟用法) ·对现在事实的虚拟（假设与现在事实相反） -结构：if从句（动词用过去式，be动词统一用were),主句(would/.could/should/might+动词原形） -例句：口If I were you,I would study harder..(我不是你，但假设我是你，我会更努力学习。)口Ifhe had time,he could go to the party.(他现在没时间，但假设他有时间，他能去派对。) ·对过去事实的虚拟（假设与过去事实相反） -结构：if从句(had+过去分词)，主句(would/could/should/.might+have+过去分词) -例句：口If she had studied yesterday,she would have passed the exam.(她昨天没学习，但假设她 学了，她会通过考试。)If we had left earlier,,we might have caught the bus.(我们之前没早出发， 但假设早出发了，我们可能赶上公交车了。) 【即学即练】 1.【对现在事实虚拟】Ifl_(be)you,I_(take)the chance to join the club 2.【对过去事实虚拟】Ifhe_(study)hard last week,he_(pass)the test. 3.【结构识别】Which sentence is the structure of virtual mood for present facts? A.If I have money,I will buy a book. B.If I had money,I would buy a book. C.If I hadhad money,I would have bought a book. D.I have money,so I buy a book. 4.【对过去事实虚拟】If they_(leave)earlier,,they_(catch)the train yesterday.. 5.【语镜判W断】The sentence"If she were free now,she would go shopping”is a virtual mood for A.present facts B.past facts C.future facts D.mixed facts 选修1|英语|沪教版 ENGLISH-选修1系列资料（沪教版） 知识点二：虚拟语气(f从句对将来事实的虚拟用法及混合虚拟语气) ·对将来事实的虚拟（假设将来不太可能发生的情况） 1.结构类型 一类型一：if从句（动词用过去式，be动词统一用were),主句(would/could/should/might+动词 原形) -类型二：if从句(should+动词原形)，主句(would/could/should/might+动词原形) -类型三：if从句(were to+动词原形)，主句(would/could/should/.might+动词原形) 2.例句 -类型一：If I had enough money next month,I would buy a new computer.(假设下个月我有足够 的钱，我会买台新电脑。实际下个月不太可能有足够钱) -类型二：If it should rain tomorrow,we should stay at home.(万一明天下雨，我们就待在家里。明 天大概率不会下雨) -类型三：If she were to come here next week,she might bring us gifts.(要是她下周来这儿，可能 会给我们带礼物。她下周来的可能性很小) ·混合虚拟语气(f从句与主句时间不一致，分别对不同时间事实虚拟) 1.常见组合 -从句对过去虚拟，主句对现在虚拟：if从句(had+过去分词)，主句(would/could/should/might+ 动词原形) -从句对现在虚拟，主句对过去虚拟：if从句（动词过去式，be动词用were),主句 (would/could/.should/might+have+过去分词) 2.例句 -组合一：If you had studied hard before,you would be an excellent student now.(从句对过去虚拟 “以前好好学习”，主句对现在虚拟“现在是优秀学生”。实际以前没好好学习，现在不是优秀学生) -组合二：If he were free today,he would have attended the meeting yesterday.(从句对现在虚拟 “今天有空”，主句对过去虚拟“昨天参加会议”。实际他今天没空，昨天也没参加会议) 知识点三：虚拟语气(f从句的省略与倒装及含蓄虚拟语气) ·f从句的省略与倒装（高中核心语法） -基本规则：当if从句中含有were,had,should时，可省略if并将这三个词置于句首，形成倒装结构， 主句语序不变。 -对现在虚拟的倒装：Were+主语+其他，主句(would/could/should/might+动词原形) *Were I you,I would take the job.(If I were you,I would take the job.) -对过去虚拟的倒装：Had+主语+过去分词，主句(would/could/.should/might+have+过去分词) *Had she studied harder,she would have passed the exam.(If she had studied harder,she would have passed the exam.) -对将来虚拟的倒装：Should+主语+动词原形，主句(would/could/should/might+动词原形) *Should it rain tomorrow,we would cancel the picnic.(If it should rain tomorrow,we would cancel the picnic. ·含蓄虚拟语气（高中常考） 1.with/without+名词短语（替代if从句） -结构：Nithout/With+名词短语，主句（虚拟语气形式） -Without your help,I couldn't have finished the work on time.(If you hadn't helped me,I couldn't have finished the work on time. 2.but for+名词短语（意为“要不是”"） -结构：But for+名词短语，主句（虚拟语气形式） -But for the bad weather,we would have arrived earlier.(If it hadn't been for the bad weather,we would have arrived earlier. 3.otherwise/or(意为“否则”，替代与过去事实相反的if从句) -结构：陈述句（过去时），otherwise/or+主句(would/could/.should/.might+have+过去分词) -He was busy yesterday,otherwise he would have helped us.(If he hadn't been busy yesterday,he would have helped us. 4.wish后的宾语从句（对不同时间的虚拟） -对现在虚拟：wish+从句（动词过去式，be动词用were) -例句：I wish I were a bird.(实际我不是鸟) -对过去虚拟：wish+从句(had+过去分词) -例句：She wishes she had seen the film last night..(实际昨晚没看电影) -对将来虚拟：wish+从句(would/could/might+动词原形) -例句：I wish the rain would stop tomorrow..(实际明天雨可能不会停) 5.asif/as though引导的状语从句（对不同时间的虚拟） -对现在虚拟：从句（动词过去式，be动词用were) -例句：He talks as if he knew everything.(实际他并非无所不知) -对过去虚拟：从句(had+过去分词) -例句：She looked at me as if she had seen me before.(实际以前没见过我) -对将来虚拟：从句(would/.could/might+动词原形) -例句：It seems as if the sun would never rise.(实际太阳会升起) 选修1|英语|沪教版 ENGL/SH- 选修1系列资料(沪教版) 考法一：if从句对过去事实的虚拟用法辨析 核心：根据上下文语境， 判断是否为对过去事实的虚拟， 正确使用if从句(had+过去分词) 和主句 (would/could/should/might+have+过去分词) 结构 真题1(语法填空)： -If she (study) hard last term， she would have passed the final exam. -答案：had studied解析：由时间标志词“last term”及主句“would have passed”可知， 此句为对 过去事实的虚拟， if从句需用“had+ + 过去分词”结构， study的过去分词为 studied。 真题2(单项选择)： -If they earlier， they the first bus yesterday. A.left； caught B.had left； would catch C.had left； would have caught D.left； would have caught -答案：C解析：由时间标志词“yesterday”可知， 此句为对过去事实的虚拟， if从句应用“had+过去 分词”， 主句应用“would/could/should/might+have+过去分词”， 故选 考法二：if从句虚拟语气与含蓄虚拟语气的混合应用 核心：结合if从句对不同时间事实的虚拟结构及含蓄虚拟语气的标志词(如without、but for、otherwise 等)，判断句子虚拟时间并选择正确动词形式 真题1(语法填空)： -But for the heavy rain this morning， we (arrive) at the station on time. -答案：would have arrived解析：由”but for+名词短语”可知为含蓄虚拟语气， 替代与过去事实相反 的 if 从句 (If it had n't been for the heavy rain) ； 对过去事实虚拟， 主句用”would+have+过去分词”， arrive的过去分词为 arrived。 真题2(单项选择)： -If she here yesterday， she would bring us gifts now. A.were B.had beer C.was D.would be -答案：B解析：句中if从句时间标志”yesterday”表明对过去事实虚拟， 需用”had+过去分词”； 主句时 间标志” 表明对现在虚拟， 用”would+动词原形”， 符合混合虚拟语气”从句对过去虚拟， 主句对现 在虚拟”的结构，故选 考法三：虚拟语气综合运用（含时态混合、倒装与含蓄表达） ·核心：结合不同时间虚拟（现在过去将来）、if从句省略倒装及含蓄虚拟标志词(without/but for/wish/as f等)，判断动词形式及句子结构 ·真题1（单顶选择）： -_hethe meeting yesterday,he would be preparing the report now. A.Had;attended B.If;attended C.Were;to attend D.Should;attend -答案：A解析：主句”would be preparing”表对现在虚拟，从句”yesterday'”提示对过去虚拟，需用"had+ 过去分词”；又因if从句含had,可省略if并倒装，故开头为"Had he attended”,选A。 ·真题2（语法填空）： -She talks as if she_(visit)the Great Wall before,but actually she hasn't.Without your re- minder(reminder),I_(forget)to book the tickets last week -答案：had visited;would have forgotten解析：第一空”asif”后表对过去虚拟，用"had+过去分词”；第 二空"Without your reminder'”替代对过去虚拟的if从句(If you hadn't reminded me),主句用"would have+过去分词”。 选修1|英语|沪教版 ENGLISH-选修1系列资料（沪教版） 真题演练 演练一：单项选择（共10题） 1.If wethe map yesterday,we wouldn't have got lost in the mountain. A.take B.took C.had taken D.have taken 2._I you,I would accept the scholarship and study abroad next year. A.Am B.Were C.Had been D.Should be 3.Without your timely support,wethe project ahead of schedule last month. A.didn't complete B.wouldn't complete C.hadn't completed D.wouldn't have completed 4.If it _tomorrow.the outdoor concert would be canceled. A.rains B.rained C.had rained D.will rain 5.He looks as if he_here for years,but he just moved in last week. A.lives B.lived C.has lived D.had lived 6.If shefree today,she would have attended the lecture yesterday. A.is B.were C.had been D.will be 7.-you_the meeting this morning,you would know the details now. A.If;attend B.Had;attended C.Were;attending D.Should;attend 8.I wish I_the chance to meet the famous author when he was in our city last month. A.had B.hadhad C.have D.will have 9.But for the heavy traffic,we_the airport on time yesterday. A.reached B.would reach C.would have reached D.had reached 10.If he_more carefully,he wouldn't make so many mistakes now. A.studied B.studies C.had studied D.would study 演练二：填空试题（共10题） 1.If I(be)you,I would apologize to her immediately. 2.She_(pass)the driving test last week if she had practiced more. 3.If it_(rain)tomorrow,we might have to postpone the picnic. 4.He talks as if he(know)everything about ancient history. 5.Without your help,I_(finish)the work on time yesterday. 6.If they-(leave)earlier,they would be here now. 7.I wish the summer vacation__(last)longer next year. 8.(be)I in your position,I would choose the red dress. 9.If she_(not miss)the train,she would have arrived by noon. 10.But for the storm,we_(climb)the mountain yesterday. 演练三：语法填空（共10空） It is often said that life is full of "what-ifs".For example,many students regret not studying harder.If they(work)harder in high school,they_(enter)their dream universities now.Similarly,some people wish they-(make)different choices in their careers.A musician once said,"I sometimes think,'If I -(choose)to learn the piano instead of the violin as a child,my life_(be)totally different now.'" Even small decisions can lead to big regrets.Imagine you forgot a friend's birthday.You might say,"If I (set)a reminder on my phone,I-(not forget)it.Or,if you missed a bus,you might think,"If I(run) a little faster,I(catch)it." Life can't be rewritten,but reflecting on "what-ifs"helps us grow.As the saying goes,"(be)there no regrets,there would be no lessons learned."So next time you face a choice,remember:every decision shapes your future. 答案 演练一：单项选择 1.C2.B3.D4.B5.D6.B7.B8.B9.C10.C 演练二：填空试题 1.were 2.would have passed 3.rained/were to rain/should rain 4.knew 5.wouldn't have finished 6.had left 7.would last 8.Were 9.hadn't missed 10.would have climbed 演练三：语法填空 1.had worked 2.would enter 3.had made 4.had chosen 5.would be 6.had set 7.wouldn't have forgotten 8.had run 9.would have caught 10.Were 选修1|英语|沪教版