Unit 2 Helpful Schoolmates1-2025-2026学年高中英语必修二语法知识点全解（重大版）

高中必修第二册重庆大学版 【寒假专版】 Unit2语法全解 寒假专版 【专题】Unit2 Helpful Schoolmates语法全 解 语法专项突破 考频分析 重庆大学版必修第二册中，Unit2 Ielpful Schoolmates相关语法是重点语法模块，考频占该年级语法 总量的15%左右，贯穿试卷所有核心题型：单项选择2-3题、完形填空2-3题、语法填空1-2题、书 面表达核心考察，直接影响句子连贯性与语境表达。在阅读理解和完形填空等语境理解类题目中， 该单元涉及的词汇辨析、固定搭配及情景交际用法往往是解题关键。 现在完成进行时是高中英语语法的重要模块，考频占语法总量的5%左右，主要分布在以下题型： 单项选择(1-2题)、完形填空(1-2题)、语法填空(1题)、阅读理解（间接考察，影响语境理 解)。在语境理解类题目中，现在完成进行时表示动作从过去持续到现在并可能继续下去的用法是 解题关键。 考查内容 ·现在完成进行时：基本结构与构成、语法意义与语境、时间标志词识别 ·情态动词：can/could,.may/might,must/have to,should/ought to,need的基本用法及被动语态 知识点一：现在完成进行时 1.基本结构与构成： 。have/has been+动词-ing形式的正确拼写与人称匹配 2.语法意义与语境： ·表示动作从过去开始持续到现在并可能继续的情境判断 ·与现在完成时的区分（强调动作的持续性Vs结果） 3.时间标志词识别： ·for+时间段、since+时间点、recently、lately等标志词的搭配应用 1 高中必修第二册重庆大学版 【寒假专版】Unit2语法全解 知识点二：情态动词的基本用法及被动语态 1.can/could(能力、许可、可能性) ·基本含义：can(现在能力/许可/可能性)，could(过去能力/委婉请求/较小可能性) ·主动语态：主语+can/could+动词原形 1.She can speak three languages 2.Could you pass me the book? ·被动语态：主语+can/could be+动词过去分词 1.This task can be finished in an hour 2.The problem could be solved by him yesterday. 2.nay/might(许可、可能性) ·基本含义：may(正式许可/较确定可能性)，might(较小可能性/更委婉请求) 。主动语态：主语+may/might+动词原形 1.You may leave the classroom now. 2.It might rain tomorrow. ●被动语态：主语+may/might be+动词过去分词 1.The meeting may be held next Monday. 2.This book might be borrowed from the library. 3.must/have to(必须、肯定推测) 。基本含义：must(主观必须/肯定推测)，have to(客观需要，有人称时态变化) ·主动语态：主语+must+动词原形/主语+have/has/had to+动词原形 1.We must follow the school rules. 2.She has to get up early every day. ·被动语态：主语+must be+动词过去分词/主语+have/has/had to be+动词过去分词 1.Homework must be handed in on time 2.This work had to be done by Friday. 4.should/ought to(应该、建议) ·基本含义：should/ought to（责任义务/建议)，ought to语气稍强 ●主动语态：主语+should+动词原形/主语+ought to+动词原形 1.You should help your classmates 2.We ought to respect our teachers. ·被动语态：主语+should be+动词过去分词/主语+ought to be+动词过去分词 1.Children should be protected well. 2 高中必修第二册重庆大学版 【寒假专版】Unit2语法全解 2.This problem ought to be solved immediately. 5.need（需要、不必) ·基本含义：作情态动词表”不必”，作实义动词表”需要” 。主动语态（情态动词）：主语+need not(needn't)+动词原形 1.You needn't come here so early. 2.Need I finish it today? ·被动语态（实义动词）：主语+need(s)/needed to be+动词过去分词 1.The flowers need to be watered every day. 2.This room needed to be cleaned yesterday. 知识点三：情态动词基础用法 1.can/could（能力、许可) 。can表示”能，会”（现在能力）→例句：She can speak three languages. ·could表示'能，会”（过去能力）→例句：I could ride a bike when I was five. 。can表示”可以”（许可）→例句：You can borrow my book, ·could表示委婉请求一例句：Could you pass me the pen? 2.may/might(许可、可能性) 。nay表示'可以”（许可）一→例句：May I come in? 。night表示”可能”（可能性比may小）→例句：It might rain tomorrow. 。may not表示”不可以”（禁止）→例句：You may not talk in the library. 3.must/have to(必须、义务) ●must表示'必须，（主观义务）→例句：We must follow the school rules. 。have to表示”不得不'（客观需要）→例句：I have to finish the work today. 。nustn't表示'禁止”→例句：You mustn't play with fire.. 。needn't表示不必”(must的否定回答)→例句：一Must I go now?一No,you needn't. 4.should/ought to(建议、责任) 。should表示”应该”（建议）一例句：You should eat more vegetables. ·ought to表示”应该”（责任）→例句：We ought to help each other. ●shouldn't表示”不应该’→例句：You shouldn't be late for class. 3 高中必修第二册重庆大学版 【寒假专版】 Unit2语法全解 考法精析 考法一：现在完成进行时的进阶应用与情景对话 1.口语交际中的省略用法 常用省略结构（日常对话)： 。省略主语和助动词→例句：Been waiting long??(=Have you been waiting long?) 。保留核心动词短语→例句：Been working on the project all week.(=I have been working on the project all week. ◆简短▣应式→例句：一You look tired.一Been studying for the exam.(=I have been studying for the exam.) 2.复杂句式中的时态嵌套 从句中的应用（语法难点）： 。宾语从句嵌套→例句：She said she has been learning French since last year. 。状语从句搭配→例句：While I have been writing the essay,my brother has been playing games. 。定语从句修饰→例句：The novel that I have been reading is very interesting. 3.情景对话补全练习 根据语境填时态（高频题型)： 1.-Why is the ground so muddy? -It_(rain)heavily since last night. 答案：has been raining 2.-You're out of breath!What_you (do)? -I_(run)to catch the bus. 答案：have,been doing;have been running 3.-How long-your father_(work)in this factory? -He_(work)here for 15 years. 答案：has,been working;has been working 4.翻译技巧提升 汉译英时态转换（易错点）： 1.他们一直在讨论这个问题，还没得出结论。 They have been discussing this problem and haven't reached a conclusion yet. 2.近十年来，我的家乡发生了巨大变化。 答案：My hometown has been changing greatly over the past ten years. 3.她这学期以来一直在努力学习，希望能通过期末考试。 She has been studying hard since this term and hopes to pass the final exam. 高中必修第二册重庆大学版 【寒假专版】 Unit2语法全解 考法二：现在完成进行时基本构成 核心：根据主语人称和动作状态，正确填写助动词have/has及动词-ing形式 真题1（语法填空）： She_(study)English since morning.Now she needs a break. 答案：has been studying 解析：由时间标志词'since morning''和'now she needs a break'”可知动作持续到现在且仍在进行，用 现在完成进行时；主语she为第三人称单数，助动词用has,动词study的现在分词为studying。 真题2（单项选择)： They_(wait)for the bus for an hour.Let's call them to check. A.have waited B.has been waiting C.have been waiting D.waited 答案：C 解析：由时间标志词for an hour”和语境Let's call them'”可知动作持续到现在，用现在完成进行时： 主语they为复数，助动词用have,动词wait的现在分词为waiting。 考法三：现在完成进行时与情态动词被动语态的结合应用 核心：结合现在完成进行时的持续动作语境，判断情态动词被动语态的正确结构（情态动词+have been+过去分词)，区分主动与被动的动作关系及时间延续性。 真题1（单项选择）： The project_by the team since last March and it may-finished next month. A.has been worked:be B.has worked;be C.has been working;be D.has been worked;been 答案：A 解析：第一空主语'the project''是动作"work”的承受者，由时间标志词”since last March'”可知用现 在完成进行时的被动语态，结构为has been+过去分词”；第二空"may”后接动词原形，被动语态 用be+过去分词”，故选A。 真题2（语法填空)： These old books_(collect)by volunteers for over two years and they should(take)to the library next week 答案：have been collected,be taken 解析：第一空主语books”是动作'collect”的承受者，由'for over two years”可知用现在完成进行时 的被动语态，结构为have been+过去分词”；第二空”should'后接动词原形，被动语态用be+过去 分词'，take的过去分词为taken。 高中必修第二册重庆大学版 【寒假专版】 Unit2语法全解 解题小妙招 考法三：现在完成进行时的综合运用与语境判断 核心：结合时间状语标志、动词特性及上下文语境，准确判断并运用现在完成进行时，区分与现在 完成时的差异，掌握口语省略及复杂句式嵌套用法。 真题1（单项选择)： -Why is your hair still wet? -I_(swim)in the pool all afternoon and just came back. A.swim B.swam C.have swum D.have been swimming 答案：D 解析：由时间状语”all afternoon'”及上下文”头发仍湿，可知动作从下午开始持续到现在刚结束，强 调持续过程，用现在完成进行时，结构为have been+现在分词'，swim的现在分词为swimming。 真题2（语法填空)： The scientists-(research)the new virus since last spring,and they haven't found a solution yet. 答案：have been researching 解析：时间标志词”since last spring”提示用现在完成进行时，强调动作从过去开始持续到现在且仍 在进行，主语'scientists”为复数，助动词用have,research的现在分词为researching。 真题演练 现在完成进行时妙招 现完进行看持续”，标志”since/for”加现在”： 动词必须是”延续”，瞬间要换持续词： 主语人称辨单复”，has/have been doing'”跟： 语境强调”未结束”，或是”过程”刚完成： 区分现完看”结果”，进行侧重”在持续”。 6