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初二上学期英语二单元知识点疑问句现在完成时的一般疑问句式是把助动词have或has提到主语之前回答Yes,…have has.No,…havent hasn^t.否定句现在完成时的否定句式是havent hasnt+过去分词”
3.现在完成时的时间状语already,just,yet,since,ever,never;
4.与一般过去时的区别一般过去时是强调动作在过去发生,而现在完成时是强调过去发生的动作对现在造成了影响和后果
5.一般过去时的时间状语yesterday,just now,…ago,last week,2years ago,in1980等例We plantedplant someflowers inthe gardenlast week.I havesent sendthe letter.He hascome comeback home,he iswatching watchTV now.David finishedfinish hishomework justnow.The monkeysare full,because wehave fedfeed them.AI havelost losemy purse!
8.Bad luck!When didyou loselose itAI lostlose itlast night.与现在完成时连用的几个副词already,just,ever,yet,never肯定句already,just疑问句和否定句ever,yet,never yet常置于句末already,never,ever just一般置于助动词have/has之后,过去分词之前.例用already,just或never,yet完成句子1I have been tomany bigcities,but I have neverbeen toShanghai.2Most ofus have already finishedour compositions.3Have theytaken downthe oldpictures yetNo,not yet.4He hasalready visitedBeijing twice.5I havejust heardthe news.I knowit.
7.现在完成时中的for和since lfor+一段时间用How long提问We haveknown eachother forten years.我们相识10年了2since+句子/具体时间since引导的短语或从句用How long提问
①since+过去一个时间点具体的年、月、日、钟点等Tom haseaten nothingsince yesterday.
②since+一段时间+ago Wehavebeenfriends sincefive monthsago.从5个月前起,我们就成了朋友
③since+从句,表示“自过去某个时间、某件事情以来”,从句时态一般过去时I havelived heresince Ileft Shanghai.©It is+一段时间+since从句,表示“自从某件事发生已有一段时间了”It istwo years since Ileft school.
8.在含for或since引导的时间状语的现在完成时中,谓语动词只能用延续性动词非延续性动词不能直接和for或since连用leave--be awaydie---be deadbegin/start--be onfinish---be overcome here--be herego there---be therecome back--be backfall asleep---be asleepget to/arrive/reach---be inleave--be awayfrom goget out--be outopen sth---keep sthopen join---be in+组织机构/be amember of+组织机构fall ill--be illget up---be upcatch acold--haveacold borrow---keep buy--have getto know---know puton--wear例
1.The old man died4years ago.The oldman hasbeen deadfor4years.
2.It is4yearssince the oldman died.Four yearshas passedsincetheoldmandied.
3.He joinedthe Party2years ago.He hasbeen inthe Partyfor2years.
4.I boughtthe book5days ago.Ihavehad thebook for5days.。