初中英语外研版（2024）八年级下册（2024））Developing ideas备课课件ppt

这是一份初中英语外研版（2024）八年级下册（2024））Developing ideas备课课件ppt，共33页。PPT课件主要包含了should，表建议，have to，表客观规则，表劝诫 ，表客观要求，shouldn’t，has to，去掉to，have→has等内容，欢迎下载使用。
学习目标1.理解情态动词shuld和have t的核心含义与本质区别2.掌握shuld/have t的肯定、否定形式及基本用法3.能根据语境正确区分并使用shuld和have t4.掌握相关句型转换技巧，熟练完成句式改写5.能在填空、选择、改错等题型中灵活运用语法点
情态动词的基础概念情态动词用来表达说话人的语气、态度或情感后接动词原形，无人称和数的变化本单元核心：shuld（主观）和have t（客观）二者均表“应该/必须”，但使用场景差异显著
shuld 核心含义与基本形式核心含义：表建议、劝告、责任或轻微推测，语气委婉肯定形式：shuld + 动词原形否定形式：shuldn't (shuld nt) + 动词原形人称特点：所有人称通用，无需根据主语变化
shuld 表“建议/劝告” 用法+例句这是shuld最常用的场景，用于给他人提建议、劝诫1.Yu shuld talk with yur parents abut the shuldn't spend t much time n phne shuld listen carefully in shuldn't be late fr schl every day.
shuld 表“责任/义务” 用法+例句用于表达分内该做的事，语气比must更温和1.A student shuld finish his hmewrk n shuld prtect the envirnment arund us.3.A teacher shuld care abut every shuld keep yur prmise t yur friends.
shuld 表“推测/预期” 用法+例句表示根据情况对事情的发展做出合理推测1.They shuld arrive at the statin in ten mvie shuld be very interesting; many peple watch shuld finish the wrk by the end f this bk shuld be n the desk; I put it there just nw.
have t 核心含义与基本形式核心含义：表客观义务、必要，强调外界规则/要求肯定形式：have t + 动词原形（有人称和数的变化）否定形式：dn't/desn't have t + 动词原形（表不必）核心：动作不是主观意愿，而是外界迫使必须做
have t 人称与数的变化规则第一/二人称单复数（I/yu/we/they）：用have t 例：I have t get up early every mrning.第三人称单数（he/she/it/单数名词）：用has t 例：She has t take a bus t schl.否定形式：对应变dn't have t/desn't have t
have t 表“客观规则/要求” 用法+例句因学校、家庭、社会等规则产生的客观义务1.We have t wear schl unifrms frm Mnday t has t finish the training befre 6 have t fllw the traffic rules when crssing the have t keep quiet in the library.
have t 过去式（had t）用法+例句表过去发生的客观必要，无人称变化，所有人称通用结构：had t + 动词原形 / didn't have t + 动词原形1.Yesterday I had t stay at hme t lk after my didn't have t g t schl last had t take a taxi because the bus was late.
have t 否定式 核心含义：不必dn't/desn't have t = needn't，表“没有必要做某事”1.Yu dn't have t bring yur textbk; I will share desn't have t finish the wrk tday; it's due dn't have t get up early n weekends.注意：与“禁止”无关，仅表无客观要求
shuld 与 have t 核心对比表（基础）
shuld 与 have t 语境辨析 例句对比主观建议（shuld）Yu shuld exercise every day t keep healthy.Yu shuld read mre bks t imprve yur English.客观要求（have t）Yu have t exercise fr an hur at schl every day.Yu have t read tw bks every mnth fr yur class.
易混点：dn't have t 与 mustn't 区别dn't have t：表“不必”，无客观要求，可做可不做 例：Yu dn't have t bring a gift t the party.mustn't：表“禁止”，绝对不能做，有严格规定 例：Yu mustn't run in the hallways at schl.核心：一个是“无要求”，一个是“严禁止”
小练习1——判断用法（shuld/have t）判断下列句子该用shuld还是have t，标注原因1._________ brush yur teeth twice a day.（_________）2._________ wear a helmet when yu ride a bike.（_____________）3._________ nt play cmputer games fr t lng.（_________）4._________ finish my hmewrk befre watching TV.（___________）
句型转换1——陈述句变建议句规则：It's a gd idea t d sth. → Yu shuld d sth.示例：It's a gd idea t practice English every day.→ Yu shuld practice English every day.关键：保留动词原形，替换句式即可
句型转换2——客观必要句改写规则：It's necessary t d sth. → 主语 + have t/has t d sth.示例：It's necessary fr her t get up early.→ She has t get up early.关键：根据主语变have t/has t
句型转换3——无需做某事改写规则：dn't need t d sth. → dn't/desn't have t d sth.示例：Yu dn't need t buy a new pen.→ Yu dn't have t buy a new pen.关键：主语为三单时，用desn't have t
句型转换4——否定劝诫句改写规则：It's nt right t d sth. → Yu shuldn't d sth.示例：It's nt right t shut at yur parents.→ Yu shuldn't shut at yur parents.关键：直接替换为shuldn't + 动词原形
句型转换 典型例题讲解（1）原句：It's a gd idea fr us t jin the English club.解析：表建议，用shuld改写，保留动词原形答案：We shuld jin the English club.技巧：忽略形式主语it，直接用真实主语作主语
句型转换 典型例题讲解（2）原句：It's necessary fr him t hand in the reprt tday.解析：表客观必要，主语he是三单，用has t答案：He has t hand in the reprt tday.技巧：注意第三人称单数的形式变化
句型转换 典型例题讲解（3）原句：She desn't need t g t the ffice n Saturday.解析：表不必，主语she是三单，用desn't have t答案：She desn't have t g t the ffice n Saturday.技巧：needn't与dn't/desn't have t可互换
语法易错点提醒（1）1.shuld后接动词ing形式：错误，必须接动词原形错误：Yu shuld reading mre. 正确：Yu shuld read t的三单形式不变：错误，三单必须用has t错误：He have t g t schl early. 正确：He has t g t schl early.
语法易错点提醒（2）3.混淆shuldn't和dn't have t：前者是“不应该”，后者是“不必”错误：Yu dn't have t be rude t thers. 正确：Yu shuldn't be rude t t变否定加nt：错误，过去式否定用didn't have t错误：He had nt t g yesterday. 正确：He didn't have t g yesterday.
专项习题1——用所给词正确形式填空用shuld/shuldn't/have t/has t/dn't have t填空1.Yu ___________ eat t much junk fd; it's bad fr ___________ get up at 6 a.m. because his schl is ___________ study hard fr ur ______________ wrry abut me; I can take care f ___________ fllw the rules in the museum.
dn't have t
专项习题2——句型转换（按要求改写）1.It's a gd idea t take a walk after dinner.（改为shuld句型）2.It's necessary fr us t clean the classrm every day.（改为have t句型）3.Yu dn't need t wait fr me here.（改为dn't have t句型）4.It's nt right t cpy thers' hmewrk.（改为shuldn't句型）5.She needs t finish the wrk befre 5 p.m.（改为has t句型）
Yu shuld take a walk after dinner.
We have t clean the classrm every day.
Yu dn't have t wait fr me here.
Yu shuldn't cpy thers' hmewrk.
She has t finish the wrk befre 5 p.m.
专项习题3——单项选择1.Yu ______ drink mre water when yu have a cld.A. shuld B. have t C. desn't have t D. shuldn't2.He ______ wear a tie t wrk; it's the cmpany rule.A. shuld B. has t C. dn't have t D. shuldn't3.Yu ______ g ut at night; it's nt safe.A. shuld B. have t C. dn't have t D. shuldn't4.We ______ take umbrellas; the sun is shining brightly.A. shuld B. have t C. dn't have t D. shuldn't
专项习题4——改错（找出错误并改正）1.Yu shuld t g t bed early every mther have t get up early t make desn't has t g t schl n dn't have t be late fr the meeting shuld playing sprts every day t keep fit.
dn't have t→shuldn't
playing→play
专项习题5——补全对话（用适当词填空）A: Hi, Tm. Yu lk wrried. What's wrng?B: I have a math test tmrrw. I'm nt gd at math.A: Yu ____________ ask yur teacher fr help. She is very kind.B: I knw, but I'm t shy. And I _________ finish my math hmewrk first.A: Yu ___________ be shy; yur teacher will be happy t help yu.B: Yu're right. And I _______________ wrry t much; I can try my best.A: That's gd. We _________ g t the library and study tgether.
dn't have t
语法知识梳理 shuld1.含义：建议、劝告、责任、推测2.形式：shuld/shuldn't + 动词原形，无人称变化3.改写：It's a gd idea t d → Yu shuld dhave t1.含义：客观规则、外界要求，表必要2.形式：have t/has t/had t + 动词原形，有人称变化3.否定：dn't/desn't/didn't have t 表“不必”4.改写：It's necessary t d → 主语 + have t/has t d
课堂小结1.本单元核心：情态动词shuld（主观）和have t（客观）的用法2.shuld后接动词原形，无人称变化，否定为shuldn't（不应该）3.have t有人称/时态变化，三单用has t，过去用had t，否定表不必4.核心区别：shuld是“我建议”，have t是“外界要求”5.易错点：后接动词原形、人称变化、dn't have t与mustn't区分