人教高中英語(yǔ)必修unitgrammarPPT教案

1、人教高中英語(yǔ)必修人教高中英語(yǔ)必修unitgrammar情態(tài)動(dòng)詞的語(yǔ)法特征1) 情態(tài)動(dòng)詞不能單獨(dú)做謂語(yǔ)情態(tài)動(dòng)詞不能單獨(dú)做謂語(yǔ), 除除ought和和have外外, 后面只能接不帶后面只能接不帶to的不定式。的不定式。 2) 情態(tài)動(dòng)詞沒(méi)有人稱情態(tài)動(dòng)詞沒(méi)有人稱, 數(shù)的變化數(shù)的變化, 但有些情但有些情態(tài)動(dòng)詞態(tài)動(dòng)詞, 如如can、will也有一般式和過(guò)去式也有一般式和過(guò)去式的變化。的變化。3) 情態(tài)動(dòng)詞的情態(tài)動(dòng)詞的“時(shí)態(tài)時(shí)態(tài)”形式并不是時(shí)間區(qū)形式并不是時(shí)間區(qū)別的主要標(biāo)志別的主要標(biāo)志, 不少情況下不少情況下, 情態(tài)動(dòng)詞的現(xiàn)在情態(tài)動(dòng)詞的現(xiàn)在式形式和過(guò)去式形式都可用來(lái)表示現(xiàn)在時(shí)間、式形式和過(guò)去式形式都可用來(lái)表示

2、現(xiàn)在時(shí)間、過(guò)去時(shí)間和將來(lái)時(shí)間。過(guò)去時(shí)間和將來(lái)時(shí)間。第1頁(yè)/共41頁(yè)只作情態(tài)動(dòng)詞的只作情態(tài)動(dòng)詞的 can / could, may / might, ought to, must可情態(tài)可實(shí)義的可情態(tài)可實(shí)義的 need, dare 可情態(tài)可助動(dòng)詞的可情態(tài)可助動(dòng)詞的 shall / should, will / would相當(dāng)于情態(tài)動(dòng)詞的相當(dāng)于情態(tài)動(dòng)詞的 have to, used to第2頁(yè)/共41頁(yè)can 和could：第3頁(yè)/共41頁(yè)第4頁(yè)/共41頁(yè)第5頁(yè)/共41頁(yè)第6頁(yè)/共41頁(yè)第7頁(yè)/共41頁(yè)第8頁(yè)/共41頁(yè)第9頁(yè)/共41頁(yè)第10頁(yè)/共41頁(yè)第11頁(yè)/共41頁(yè)第12頁(yè)/共41頁(yè)第13頁(yè)/共

3、41頁(yè)第14頁(yè)/共41頁(yè)第15頁(yè)/共41頁(yè)第16頁(yè)/共41頁(yè)（表請(qǐng)求）第17頁(yè)/共41頁(yè)（表意愿）（表許可）第18頁(yè)/共41頁(yè)第19頁(yè)/共41頁(yè)第20頁(yè)/共41頁(yè)第21頁(yè)/共41頁(yè)第22頁(yè)/共41頁(yè)1.must用于一般問(wèn)句中用于一般問(wèn)句中,肯定回答用肯定回答用must否定式用否定式用 neednt或或dont have to，做做 “不必不必”, mustnt表示表示“禁止，不允禁止，不允許許” MustIfinishallassignmentsatatime?Yes,youmust.No,youneednt.第23頁(yè)/共41頁(yè)I dont like this TV set. We must

4、buy a new one. There was no more bus. They had to walk home.2.表示表示“必須必須”這個(gè)意思時(shí)，這個(gè)意思時(shí)，must 和和have to 稍有區(qū)別。稍有區(qū)別。must著重說(shuō)明主觀著重說(shuō)明主觀看法，看法，have to 強(qiáng)調(diào)客觀需要。另外，強(qiáng)調(diào)客觀需要。另外，have to 能用于更多時(shí)態(tài)。能用于更多時(shí)態(tài)。 第24頁(yè)/共41頁(yè)Youmustbethenewteacher.Hemustbejoking.Thereisnobodyhere.Theymusthaveallgonehome.3.must表示對(duì)某人某事的猜測(cè)表示對(duì)某人某事的猜測(cè),

5、 作作“準(zhǔn)準(zhǔn)是是”, “一定一定” , 一般用于肯定句中。對(duì)一般用于肯定句中。對(duì)過(guò)去發(fā)生的事情作肯定判斷用過(guò)去發(fā)生的事情作肯定判斷用must have done 第25頁(yè)/共41頁(yè)He must come and worry her with question, just when she was busy cooking the dinner. Of course，after I gave her my advice，she must go and do the opposite.4. must表示表示“偏要偏要, 硬要硬要”, 指做令人不指做令人不快的事情快的事情第26頁(yè)/共41頁(yè) can

6、 / could, may / might, should和和must都可表示肯定的推測(cè)。都可表示肯定的推測(cè)。can / could表示表示客觀可能性；客觀可能性；may表示推測(cè)時(shí)，其語(yǔ)氣表示推測(cè)時(shí)，其語(yǔ)氣不肯定；不肯定；might語(yǔ)氣更弱，表示某事實(shí)語(yǔ)氣更弱，表示某事實(shí)際發(fā)生的可能性；際發(fā)生的可能性；should表示確定或可表示確定或可能有的未來(lái)或期待；能有的未來(lái)或期待；must表示比較肯定表示比較肯定的語(yǔ)氣的語(yǔ)氣。如：。如：第27頁(yè)/共41頁(yè)I think advertisements can be quite dangerous.The newcomer may be dismissed

7、 by the company.The rescue team should arrive by 5 oclock this afternoon.I think the old woman must be a nice person.第28頁(yè)/共41頁(yè)could, might, would, should都可表示委都可表示委婉語(yǔ)氣。婉語(yǔ)氣。如如:I wonder if you could let me use your cell phone. Might I know your telephone number?第29頁(yè)/共41頁(yè) 2. A: _ Xiao Feng find the orig

8、in of Easter from that book? B: No, he _.Wouldd like to go with you on SaturdayCouldcouldnt find itExercise 第30頁(yè)/共41頁(yè)3. A: _ I go with my friend to the harvest festival? B: Yes, you _ _.should study scienceMay may go (with your shouldfriends)第31頁(yè)/共41頁(yè)cant play the role of theCanprince第32頁(yè)/共41頁(yè)Mighto

9、r Shouldmight stopor should stop playing tricksplaying tricks at Halloweenat Halloween第33頁(yè)/共41頁(yè)can; couldWhen I was young I _ climb any tree in the forest.Learning a language _ be a real challenge.couldcanII. 選用正確的情態(tài)動(dòng)詞填空。第34頁(yè)/共41頁(yè)may; mightI asked if I _ go home half an hour earlier today.There _ no

10、t be enough money to pay for the repairs.mightmay / might第35頁(yè)/共41頁(yè)will; wouldWhen he got older, he _ never do his homework.Nancy _ keep talking unless you tell her to shut up.wouldwill第36頁(yè)/共41頁(yè)shall; shouldBy now, they _ already be in Dubai.I _ be replaced by someone from the New York office.shouldshall第37頁(yè)/共41頁(yè)must; ca