8BUnit1PastandPresentGrammar1.Tomasterthestructureandbasicusageofpresentperfecttense(PPT).（掌握现在完成时的基本结构、用法。）2.Tolearntherulesofformingthepastparticipleofverbs.（学习动词的过去分词变化规则。）3.TolearnsometimeexpressionsusuallyusedinPPT.（学习常用在现在完成时里的时间表达方式。）Learningaims1.HowlonghasMr.ChenlivedinSunshineTown?2.CanMr.Chenseehisoldfriendsasoftenasbefore?Hehaslivedheresincehewasborn.No.Becausemostofhisoldfriendshavemovedaway.Lead-inAskandanswerhave+done(动词过去分词)I'vejusteatenit.You'vechanged.Wehavelivedheresincethen.Haveyouseenmyfood？Haveyouevermovedhouse?Hasthetownchangedalotovertheyears?······Pre-task:MoreexamplesTrytofindmoresentenceswith"have/has+done"inthebook.Whendoweusepresentperfecttense?While-taskTask1:LearnbyyourselvesWeusethepresentperfecttensetotalkaboutanactionthatstartedinthepastandcontinuestothepresent.表示过去开始，现在还在继续的动作。Weusethepresentperfecttensetotalkaboutanactionthathappenedinthepastandhasaconnectionwiththepresent.表示过去发生的或已完成的动作对现在造成的影响或结果。PastpresentEddiehaseatenmyfood.Discuss:What'sthebasicstructureofPPT?Subject(主语)have/has+(not)（助动词）pastparticiple(过去分词)I/You/We/Theyhave(not)moved.He/She/Ithas(not)moved.Task2:GroupworkHave/Has+主语+动词的过去分词？HaveI/you/we/theymoved?Hashe/she/itYes，I/you/we/theyhave.he/she/ithas.No，I/you/we/theyhave.not/haven’t.he/she/ithasnot/hasn’t.一般疑问句already:表示已经发生（肯定）ever:表示“曾经”（否定句/疑问句）for:表示一段时间just:表示“刚刚”never:表示“从不”（否定句）recently:表示“最近”since:表示“自---以后”yet:表示“已经”或者“还没有”（疑问句/否定句）AdverbsoftimeAdverbsoftime1.I________(have)lunchalready..2.Hasthetrain_______(arrive),yet?3.Tome____never______(beto)China.4.Thetwin______just_____(see)myfather.5.Thetwins____(see)myfatherjustnow.havehadarrivedhasbeentohasseensawExercisesExercisesWeusethesimplepasttensetotalkaboutwhathappenedatadefinitetimeinthepast.（一般过去时谈论在过去的特定时间发生的事...
