初二英语外研版第二模块现在完成时.ppt
现在完成时,思考,如果我要表达：我已经看完了电视！如何表达？I watch TV.?I watched TV.？I was watching TV.？,1,我已经看完了电视,I have watched TV.,表示1.目前为止已经完成的事情2.过去发生或已经完成的某一动作对现在造成的影响和结果。They have left.-他们已经离开了。（也就是说现在他们人不在这里）I have had my lunch.-我已经吃过午饭了。（也就是说我现在不饿）,现在完成时的含义,now现在,past过去,future将来,现在完成时,表示过去发生 或 已经完成的 某一动作 对现在造成的影响和结果。,现在完成时的构成形式,have done has,助动词,过去分词,助动词have/has可和前面的主语缩略为ve,s.如 theyve,weve,hes,itshas not=hasnthave not=havent,缩写格式,过去分词的变化,1、一般动词，在词尾加+ed work,plant,call2.以字母e结尾的动词，词尾加+d live,change,like,love,agree,save hate,3.以重读闭音节结尾，末尾只有一个辅音字母的 双写辅音字母ed.如 plan,stop,drop,fit(适合),prefer(更喜欢),travel4.以辅音字母y，结尾，变y为ied try,study,carry,hurry,cry,worry,copy,1.肯定句主语+have/has+过去分词+(其他）。eg:He has bought lots of book.2.否定句:主语+have/has+not+过去分词+(其他）。eg:We havent travelled around the world.,句型结构,句型结构,3.一般疑问句 Have/has+主语+过去分词 Yes,主语+have/has.No,主语+have/hasnt.eg:Has he been to Beijing?Yes,he has./No,he hasnt.,句型结构,4.特殊疑问句 特殊疑问词+一般疑问句（have/has+主语+过去分词）eg:How long have you been here?5.被动语态 肯定：have/has been done 否定：have/has not been done eg:Her novel has been published.Her novel has not been published.,和现在完成时连用的时间状语,例句,1.我已经做完了我的作业2.我还未完成我的作业3.我从未读过这本书4.你看过这个电影吗5.最近我没有看见过麦克6.他刚刚看见了麦克,need 用法,(一)用作情态动词没有人称、数和时态的变化 1.肯定句：need do sth.need后面直接跟动词原形 eg:He need go to the park at once.2.否定句：neednt eg:I neednt give him a call tomorrow morning.3.一般疑问句：把原句中的情态动词提到句首，其他成 分照抄。Need you give him a call tomorrow morning?,(二)用作实义动词：有人称、时态和数的变化 1.基本用法：need to do/need sb to do eg：She needed to post the letter last night.2.句式：need作为实义动词，改为否定句时借用助动词do/does/did。肯定句：I need to give him a call tomorrow.否定句：I dont need to give him a call tomorrow.一般疑问句：Do you need to give him a call tomorrow?,
