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1、Unit8HaveyoureadTreasureIslandyet?SectionA3(GrammarFocus4a-4c)Step1WarmupReadthefollowingsentenceswehaveseen.HaveyoureadLittleWomenyet?Yes,Ihave./No,Ihaven't.HasTinareadTreasureIslandyet?Yes,shehas.Shethinksit’sfantastic.Haveyoudecidedwhichbooktowriteaboutyet?Yes,Ihave.I’vealread
2、yfinishedreadingit.Itwasreallygood.Step2現(xiàn)在完成時(shí)用法1.表示過(guò)去發(fā)生或已經(jīng)完成的某一動(dòng)作對(duì)現(xiàn)在造成的影響或結(jié)果。e.g.–Haveyouhadyourlunchyet?–Yes,Ihave.I’vejusthadit.(現(xiàn)在我不餓了。)2.表示動(dòng)作或狀態(tài)從過(guò)去某一時(shí)刻開(kāi)始,一直延續(xù)到現(xiàn)在,而且可能還要繼續(xù)下去。e.g.Ihaven’tseenherthesedays.I’veknownBobforthreeyears.I’vebeenatthisschoolforovertwoyears.時(shí)間狀語(yǔ)already,
3、yet,just,ever,never,before構(gòu)成現(xiàn)在完成時(shí)是由“助動(dòng)詞have/has+動(dòng)詞的過(guò)去分詞”構(gòu)成的,規(guī)則動(dòng)詞的過(guò)去分詞構(gòu)成與過(guò)去式相同,不規(guī)則動(dòng)詞的過(guò)去分詞則需逐個(gè)記憶。動(dòng)詞的過(guò)去式的變化和過(guò)去分詞的變化并不完全相同。我們對(duì)它們作了一個(gè)大致的分類。(注:例子中單詞的變化順序?yàn)椋簞?dòng)詞原形→動(dòng)詞的過(guò)去式?→動(dòng)詞的過(guò)去分詞)一、過(guò)去式和過(guò)去分詞的變化相同規(guī)則變化:1.一般在動(dòng)詞詞尾直接加ed。如:pick→picked→picked;wish→wished→wished;stay→stayed→stayed2.以不發(fā)音的e結(jié)尾的動(dòng)詞后面加d
4、。如:like→liked→liked;hope→hoped→hoped;phone→phoned→phoned3.以“輔音字母+y”結(jié)尾的動(dòng)詞,變y為i,再加-ed。如:study→studied→studied;hurry→hurried→hurried;reply→replied→replied4.詞尾只有一個(gè)輔音字母的重讀閉音節(jié)動(dòng)詞,要雙寫輔音字母,再加-ed。如:stop→stopped→stopped;clap→clapped→clapped不規(guī)則變化:5.以不變應(yīng)萬(wàn)變。如:let→let→let;put→put→put;read→read→
5、read6.若中間有雙寫e,則去掉一個(gè)e,單詞末尾再加t。如:feel→felt→felt;keep→kept→kept;sleep→slept→slept7.結(jié)尾的字母d變t。如:lend→lent→lent;build→built→built;send→sent→sent8.變?yōu)橐?ought或-aught結(jié)尾。如:buy→bought→bought;bring→brought→brought;catch→caught→caught;teach→taught→taught句式1.肯定句:主語(yǔ)+have/has+過(guò)去分詞(+其他)2.否定句:主語(yǔ)+ha
6、ve/has+not+過(guò)去分詞(+其他)3.一般疑問(wèn)句:have/has+主語(yǔ)+過(guò)去分詞(+其他)4.特殊疑問(wèn)句:1)特殊疑問(wèn)詞(不是句子主語(yǔ))+have/has+主語(yǔ)+過(guò)去分詞(+其他)2)特殊疑問(wèn)詞(是句子主語(yǔ))+have/has+過(guò)去分詞(+其他)already和yet都可以作為現(xiàn)在完成時(shí)的標(biāo)志詞,但它們的用法不同?!鬭lready一般用于肯定句中。如:Wehavealreadycleanedupourclassroom.注意:already用于疑問(wèn)句中時(shí)通常表示驚奇。如:Haveyoufinishedyourhomeworkalready?Ica
7、n’tbelieveit.◆yet一般用于疑問(wèn)句和否定句中。如:Haveyouseenheryet?Thebushasn’tcomeyet.活學(xué)活用Writetheformsofthepasttenseandpastparticiple:drink____________see________find___________leave________tell________—WhyisMr.Yangstillintheteachers’office?—Maybehe________hisworkyet.A.doesn’tfinishB.hasn’tfini
8、shedC.haven’tfinishedStep3Exercises1.Fin