UNIT 4 LESSON 25 Billy Tried to Do Magic Tricks--过去进行时与现在进行时比较.ppt

UNIT4LESSON25BillyTriedtoDoMagicTricks 过去进行时与现在进行时比较 复习现在进行时态 Tom play football is ing Lucy is read abook ing They watch TV are ing Look Thetwins think are ing now 用法 现在进行时态表示现在 说话瞬间 正在进行或发生的动作 一 什么是现在进行时 现在分词的构成 二 现在进行时的谓语构成 am is are 动词的现在分词 V ing 讨论 现在分词的变化形式有多少种呢 buycallenjoyplaystandtalktellwaitwalk buyingcallingenjoyingplayingstandingtalkingtellingwaitingwalking havedriveliketakewriterunshopsitlie havingdrivinglikingtakingwritingrunningshoppingsittinglying 观察 归纳现在分词的构成规则 动词的现在分词的变化规则 动词 ing的构成 1 一般动词直接在词尾加ing如 read readinglook lookingplay playingeat eating2 以不发音的 e结尾的词先把去掉e再加 ing如 take takinghave having 3 以 辅音字母 元音字母 辅音字母 结尾的重读闭音节结尾的词 应双写末尾辅音字母 再加ing 如 sit sittingrun runningget gettingswim swimmingshop shoppingput puttingset settingstop stoppingbegin beginning 注意 辅音字母 en 辅音字母 元音字母 w 辅音字母 元音字母 y 不是重读闭音节 如listen listening sow sowing sew sewing play playing 4 以ie结尾的动词 把ie改为y 再加ing 这样的单词有三个 die dyinglie lyingtie tying 三 现在进行时的判断 2 根据句中提示词 如listen look等 eg Listen Lucyissinging Look sheistalkingwiththeteacher 3 根据上下文判断 eg Bequiet Thebabyissleeping 1 根据常用时间状语 如now atthemoment 此刻 现在 atpresent 目前 现在 rightnow此刻 现在 eg Whatareyoudoingnow Iamreadingabook 四 现在进行时的陈述句变疑问句和否定句 结构 be doing be要根据主语作人称和数的变化 句型转换1 肯定句转换成否定句 要在be后加not构成eg WearereadingEnglishnow WearenotreadingEnglishnow 2 陈述句转换成一般疑问句 把be动词提到句首eg Thestudentisdrinking Isthestudentdrinking 3 陈述句转换成特殊疑问句 由 疑问词 一般疑问句 构成eg Heisworking Whatishedoing Whatwereyoudoingwhentheteachercamein 什么是 过去进行时态 ThePastContinuousTense 过去进行时态 观察过去进行时的构成 Whatwereyoudoingat7o clocklastnight Iwasdoingsomehousework Whatwereyoudoingat7o clocklastnight Iwashavingdinner Whatwereyoudoingbetween7o clockand9o clockyesterday Iwasdoingmyhomework IwaswatchingTV Whatwasyourfatherdoingwhenyoucamebackhomeyesterday Hewascooking Whatwasyourbrotherdoingwhenyousawhimhalfanhourago Hewasplayingcomputergames Whatweretheydoingatthattimelastweek Theywereshopping Howaboutthem Theywerehavingapicnic 助动词was were doing Sb 一 过去进行时的构成 一般疑问句 回答 肯 Yes 主语 was were Was Were Sb 主语 doing 否 No 主语 was t weren t 特殊疑问句 疑问词 was were Sb 主语 doing 否定句 Sb 主语 wasn t weren t doing 二 过去进行时的用法 表示在过去某一具体时刻或过去某一阶段内正在进行的动作 强调某一动作在过去某时正在进行 Iwasplayingcomputergamesattenlastnight Jim sfamilywerehavingsupperwhenIcamein Itwasraininghardatthistimeyesterday TheywerestudyingEnglishthesedays 三 过去进行时的判断 1 过去的具体某个时间 如 at10 00lastnight atthistimeyesterday from8 00to10 00lastnight atthattime atthatmoment thesedays等 2 在连词when和while引导的时间状语从句中 如果主从句动作差不到同时发生时 Thestudentsweredoinghomeworkwhentheteachercamein Hewaslisteningtomusicwhilehewasdoinghishomework 附 when和while的区别 1 相同之处 当 的时候 引导时间状语从句 2 不同之处 1 when 延续性动词或非延续性动词while 延续性动词 e g Whenthechildwasplayingfootballontheroad acarhithim MrsGreenheardaterriblesoundwhileshewassittingintheroom 2 when后多用一般时态 while后多用进行时态 e g Whatwereyoudoingwhentheteachercamein Don ttalksoloudwhileothersarestudying 四 过去进行时和现在进行时的区别 HeiswatchingTVnow future past now 现在进行时 HeiswatchingTVnow future past now 过去