英语人教版八年级下册Unit8 Grammar Focus 课件.ppt

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1、SectionA3Grammarfocus-4cUnit8HaveyoureadTreasureIslandyet?Learningaims:Knowledgeaims:Sscanusepresentperfecttensetotalkaboutevents.Abilityaims:Talkandwriteusingpresentperfecttense.Moralaims:Treasuretimeandeverything.Teachingkeypoints:1.have/hasdone2.过去分词3.already/yetRevisionRea

2、dthefollowingsentenceswehaveseen.HaveyoureadLittleWomenyet?Yes,Ihave./No,Ihaven't.HasTinareadTreasureIslandyet?Yes,shehas.Shethinksit’sfantastic.Haveyoudecidedwhichbooktowriteaboutyet?Yes,Ihave.I’vealreadyfinishedreadingit.Itwasreallygood.1.表示过去发生或已经完成的某一动作对现在造成的影响或结果。e.g.–Hav

3、eyouhadyourlunchyet?–Yes,Ihave.I’vejusthadit.(现在我不饿了。)2.表示动作或状态从过去某一时刻开始，一直延续到现在，而且可能还要继续下去。现在完成时e.g.Ihaven’tseenherthesedays.I’veknownBobforthreeyears.I’vebeenatthisschoolforovertwoyears.时间状语already,yet,just,ever,never,before，since.already和yet都可以作为现在完成时的标志词，但它们的用法不同。◆already一

4、般用于肯定句中。如：Wehavealreadycleanedupourclassroom.注意：already用于疑问句中时通常表示惊奇。如：Haveyoufinishedyourhomeworkalready?Ican’tbelieveit.◆yet一般用于疑问句和否定句中。如：Haveyouseenheryet?Thebushasn’tcomeyet.3.句式1.肯定句：主语+have/has+过去分词(+其他)2.否定句：主语+have/has+not+过去分词(+其他)(haven’t/hasn’t)3.一般疑问句：have/has+主语+

5、过去分词(+其他)4.特殊疑问句：特殊疑问词(不是句子主语)+have/has+主语+过去分词(+其他)2)特殊疑问词(是句子主语)+have/has+过去分词(+其他)构成现在完成时是由“助动词have/has+动词的过去分词”构成的，规则动词的过去分词构成与过去式相同，不规则动词的过去分词则需逐个记忆。一、过去式和过去分词的变化相同规则变化：一般在动词词尾直接加ed。如：pick→picked→picked;2.以不发音的e结尾的动词后面加d。如：like→liked→liked;3.以“辅音字母+y”结尾的动词，变y为i，再加-ed。如：st

6、udy→studied→studied;hurry→hurried→hurried;4.词尾只有一个辅音字母的重读闭音节动词，要双写辅音字母，再加-ed。如：stop→stopped→stopped;clap→clapped→clapped不规则变化：5.以不变应万变。如：let→let→let;put→put→put;read→read→read6.若中间有双写e，则去掉一个e，单词末尾再加t。如：feel→felt→felt;keep→kept→kept;sleep→slept→slept7.结尾的字母d变t。如：lend→lent→lent;

7、build→built→built;send→sent→sent8.变为以-ought或-aught结尾。如：buy→bought→bought;bring→brought→brought;catch→caught→caught;teach→taught→taughtExercises4aUsethewordsinbracketstocompletetheconversations.1.A:Wouldyoulikesomethingtodrink?B:No,thanks._______________________.(just/drinksome

8、tea)2.A:Iheardyoulostyourkey.____________________?(find)B:No,