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单击此处编辑母版标题样式,单击此处编辑母版文本样式,第二级,第三级,第四级,第五级,*,Unit 2Healthy eating,Unit 2,Grammar,Grammar,情态动词,用法,对应的意思,can and could,1.,表示能力,能,2.,表猜测（疑问或否定句）,不可能,3.,表许可或者请求许可,可以,may and might,1.,表许可或者请求许可,可以,2.,表可能性,可能,3.,表祝愿,祝,情态动词用法对应的意思1.表示能力能2.表猜测（疑问或否定句,情态动词,用法,对应的意思,must,1.,表示必要性,必须,2.,表推测（肯定句）,一定，肯定,3.,表不可为而为,偏偏，偏要,4.,表示禁止,不许，不准，不可以,shall,1.,二，三人称，表命令，允诺，警告等,2.,一，三人称问句中，表征求对方意见,3.,第一人称，表将来,情态动词用法对应的意思 1.表示必要性必须2.表推测（肯定,情态动词,用法,对应的意思,should,1.,表示应当,应当，应该,2.,表示推测,（按道理按计划）应该会,will,1.,表示愿望，计划,将,2.,表示倾向或者习惯性动作,会,3.,表请求，询问,请,好吗？,would,1.,过去曾有的,要，会，将,2.,委婉请求，看法,请,好吗？,情态动词用法对应的意思should1.表示应当应当，应该2,Find the sentences containing modal verbs in the reading passage.,Then by lunchtime they,would,all be,sold.,What,could,have happened?,Nothing,could,be better.,Something terrible,must,have happened if Li Chang was not to coming to eat in his restaurant as he always did.,Find the sentences containing,He,could not,believe his eyes.,Perhaps he,should,go to the library and find out.,He,had better,do some research!,Even though her customers,might,get thin after eating Yong Huis food,They,would,become tired very quickly.,He could not believe his eyes.,1.,should,和,ought to,a.should,ought to,都可表示“应该”。,ought to,用于,表示按道理应当,，常指,客观的义务或责任,，,大多数情况下可用,should,代替，但比,should,语气重,。,I,should,help her because she is in trouble.,You,ought to,take care of the baby.,Modal verbs,1.should和ought toI should hel,b.,表示劝告、建议或命令时，,should,和,ought to,可通用,，但在,疑问句中常用,should,。,ought to,的否定式为,oughtnt to,或,ought not to,。,You,should/ought to,go to class right away.,_ I open the window?,What,should,we do next?,Should,b.表示劝告、建议或命令时，should You shou,You _(ought to)leave in such a hurry.,你不应该离开的这么匆忙。,oughtnt/ought not to,You _(oug,c.,should,ought to,都可表示推测。,He,ought to/should,be home by now.,This is where the oil,ought to/should,be.,注意：,should,和,ought to,后面跟动词不定式的完成式,其肯定句表示“过去应该做而未做”,其否定句则表示“过去不该做但做了”。,c.should,ought to 都可表示推测。He,You _ the decision a week ago.,你应该在一周前就做决定。,I _ such a foolish mistake.,我不应该犯这样愚蠢的错误。,多数情况下，,ought to,可与,should,互换使用。,ought to,的反意疑问句用,shouldnt,替代。,should/ought to have,made,shouldnt have made,You _,You ought to have helped him with his English,_?,A.wont you,B.ought not you,C.shouldnt you,D.wouldnt you,You ought to have helped him w,2.must,和,have to,must,的用法,1),表示主观的义务和必要,主要用于肯定句和疑问句,意思为“必须,，得,，要,”,；由,must,引起的疑问句，,肯定回答,要用,must,或,haveto,否定回答,要用,neednt,或,donthaveto,意思是“不必”；,2.must和have to,must,的否定形式,mustnt,表示禁止，意思是“不能，不许”,。如：,Must,Ifinishthetaskrightnow?,我现在必须完成这个工作吗？,Yes,you,must,./Yes,youhaveto.,是的。,(No,you _./No,you dont have,to.,不，不必。,),You,mustnt,come here without permission.,未经允许，你不能来这儿。,neednt,must的否定形式mustnt表示禁止，意思是“不能，不许,haveto,的用法,1)must,表示一种主观的需要，而,haveto,表示一种客观的需要，意思是“不得不”,。如：,I,have to,attend an important meeting this afternoon.,今天下午我不得不参加一个重要的会议。,Mother is out,so I,have to,look after the shop.,妈妈不在家，因此我不得不照看商店。,have,2),haveto,的否定形式是,dont have to,相当于,neednt,。,如：,They,dont,have to,buy a computer at present.,他们目前没有必要买电脑。,have to,的第三人称单数形式是,has to,，一般过去式是,had to,，一般将来式是,will have to,。,Li Hua,has to,pass an examination before he can start work.,My car was broken,so I,had to,walk home.,Itll,have to,be on a Sunday.Ill be working every other day.,have to的第三人称单数形式是has to，一般过去式是,The boss has given everyone a special holiday,so we _ go to work tomorrow.A.cant B.mustnt,C.neednt D.shouldnt,【,点拨,】,考查情态动词。根据题意,可知这里表示“没有必要”,故只能选,C,项。,The boss has given everyone a,What do you think we can do for our aged parents?,You _ do anything except to be with them and be yourself.,A.dont have to B.oughtnt to,C.mustnt D.cant,【,点拨,】,根据题意“除了和他们呆在一起做你自己外,没有必要做任何事情。”可知这里选择,dont have to,表示“不必”。,故选,A,项。,What do you think we can do,3.must,和,need,need,作情态动词时,只能用于疑问句和否定句。构成否定句和疑问句时不借助于助动词,do,。,Need,I finish the work today?,Yes,you,must,./No,you,neednt,.,3.must和need,b.need,也可做实义动词，常用于下列句式：,主语（,sb,）,need to do sth.,主语（,sth,）,need to be done/doing,主语,need+n.,You need _(know)your own weakness and strength.,The cucumbers and mushrooms need _(cut)up to make dumplings.,I need some _,（醋）,.,to know,vinegar,to be cut/cutting,b.need 也可做实义动词，常用于下列句式：to kno,情态动词,用法,ought/oughtnt to,按道理应当，常指客观的义务和责任,should/shouldnt,劝告，建议，命令,mustnt,禁止，严禁,neednt,不必，没有必要,(dont)have to,不得不，强调客观需要,will,将，会，,请,好吗？,can/cant,能力，许可，否定疑问表推测,情态动词用法ought/oughtnt to 按道理应当，,Choose suitable modal verbs below to complete the following dialogues.,ought/oughtnt to should/shouldnt will,mustnt neednt (dont)have to can/cant,1.Sam:How can I grow thinner,Mum?,Mum:Well,you _ eat food with,plenty of fibre that helps you,digest better.And you _ stop,drinking cola or eating sweet food.,have to,should,Discovering useful structures,Choose suitable modal verbs be,Sam:Does it mean I _ eat my,favourite fried chicken any more?,Mum:Not exactly,if you love fried,chicken,you _ give it up.,Just eat it less often.You,_,worry too much:a little fried,chicken _ do you good!,shouldnt,neednt,dont have to/neednt/shouldnt,will,Sam:Does it mean I _,2.Doctor:You are sick because youve,eaten poisonous mushrooms.,Where did you get them?,Lucy:I picked them
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