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

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1、UNIT4LESSON25BillyTriedtoDoMagicTricks--过去进行时与现在进行时比较复习现在进行时态Tomplayfootball.isingLucyisreadabook.ingTheywatchTVareingLook!Thetwinsthinkareing.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？buycallenjoyplaystandtalktellwait

2、walkbuyingcallingenjoyingplayingstandingtalkingtellingwaitingwalkinghavedriveliketakewriterunshopsitliehavingdrivinglikingtakingwritingrunningshoppingsittinglying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-

3、ing如：take-takinghave-having3).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、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?--

5、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?Whatwereyoudoin

6、gwhentheteachercamein?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.Whatwasyourfathe

7、rdoingwhenyoucamebackhomeyesterday?Hewascooking.Whatwasyourbrotherdoingwhenyousawhimhalfanhourago?Hewasplayingcomputergames.Whatweretheydoingatthattimelastweek?Theywereshopping.Howaboutthem?Theywerehavingapicnic.助动词was/weredoing+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