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1、B2U4GrammarandUsageModalverbs1.earningaims:Bytheendofthisclass,studentswillbeableto:1. identifyandcategorizetheusageofmodalverbs;2. summarizegeneralrulesofmodalverbs;3. distinguishandusetherightmodalverbstofinishtasksofofferingsuggestionsandmakingrules;Step11.ead-inWhatshallIread?Step2ReadingTask1Fi
2、ndthekeyphrasesinpartAonpage481.不止一次2.首先3.特别；尤其4.值得做某事5.浏览6.有可能做7.偶然发现8.慢慢地9.物色到；挑选出10.更加Task2CompletethemindmapbelowTask3FindsentenceswithmodalverbsandcirclethemTask4FigureouttheusagesofthemodalverbsandnishthechartinpartAStep3WorkingouttherulesFinishtheblanksonpage48Step4Usagesofthemodalverbs1. can
3、&could1）表能力Shecandance.Shecoulddancewhenshewasachild.（过去的能力）2）表征求意见Can/Couldyoustopchasingme?3）表猜测，Can表猜测多用于否定和疑问-Ohmygod!Canitbetrue?-Itcan*tbetrue.2. may/might1）表示许可,请求，作“可以“解释MayItakephotoshere?2）表示猜测作“可能也许”解释Theymay/mightberelatives,（might可能性更小）3）表不愿望，祝愿Mayyousmileallthetime.4）常用词组积累may/mightasw
4、elldosth.不妨做某事Youmay/mightaswelldotheexperimentagain3. must1）表示必须，应该Imusttakecareofmyhairstyle.2）mustnt表示禁止，不允许Youmustn,tbullyyourbrother.3）表示“一定是，用于肯定猜测，mustdo/bedoing肯定做某事/正在做某事musthavedone肯定做过某事（完成）Hemusthaveseentheanswer.4. will&would1）表示习惯性动作（habit）,will表示现在的习惯，would表示过去的习惯。如：Marywilllistentomu
5、sicforhoursinherroom.IwouldtakeawalkaftersupperwhenIwasyoung.2）表示意愿（willingness）o如：Thebabywon,tgotosleep.3）表示请求（request）,would比will更委婉些Wouldyougivemesomeadvice?5. should1） .表责任或义务，应该，应当Youshouldcompleteyourtestintime.2） .表较大可能实现的猜测，推断，意为“可能，应该”Thestreetshouldbecrowedatweekends.3） .表万一ShouldIbefreeto
6、morrow,Iwillcome4） .表意外，竟然，居然”Agentlemanlikehimshouldberudetoalady.6. oughtto表义务，意为“应该”（因责任、义务等该做），语气比ShOUki稍重。Youarehisfather.Yououghttotakecareofhim.Yououghtn,ttosmokesomuch.7. shall1）用于第一、第三人称的疑问句中，表征询意见或请求允许，多与I或We连用。Whatshallwedothisweekend?Whenshallmybrotherbeabletoleavehospital?2）用于第二、第三人称，表示
7、说话人的命令、警告、允诺或威胁。HeshallbePUniShCd.（威胁）Youshallgowithme.（命令）Youshallhaveanewdressforyourbirthday.（允诺）3）常用于主语是第三人称的条约、法律法规、规章制度等文件中表“义务”或“规定工Everystudentshallwearschooluniformatschool.8. need&dare1） need和dare可以作实义动词或情态动词。作情态动词时，后跟动词原形，表示“需要，有必要“，无人称和数的变化，多用于否定句、疑问句或条件句中。Idarenotwalkthroughthewoodsatni
8、ght.Youneedn,tgotherenow.NeedIhandinthepapernow?2）作实义动词时，同其他实义动词一样，可用于各种句式，有时态、人称和数的变化，构成否定句和疑问句时要借助于助动词。在否定句和疑问句中不定式符号to也可以省略。Youdon,tneedtobesoworried.Youneedtobemorecareful.Theydon,tdare（to）makeasoundwhiletheirparentsaresleeping.Step5modalverbs+havedone1.musthavedone表示对过去行为的推测，意为“一定，想必做过“，语气十分肯定I
9、tmusthaverainedlastnight,asthegroundiswet.2. couldhavedone在肯定句中是虚拟造气表示“本来能做但却没做”couldnthavedone多用于语气强烈的否定，意为“过去不可能做过”Don,tworry.Theycouldhavejustforgottentocall.IsawMr.1.ijustnow.HecouldnthavegonetoBeijing.3. may/mighthavedone表示对过去行为的推测，意为“可能做过”,might所表示可能性较弱Smithmighthavegonetoseethemovieyesterday.
10、4. should/oughttohavedone本该做某事而实际上未做，shouldn,toughtn,ttohavedone不该做某事反而做了Youshouldhavemadefullpreparations.Youshouldnthavebulliedyourbrother5. neednthavedone表示对过去的虚拟意为“本来不必做某事而实际上却做了“Iactuallyneedn,thaveboughtsomuchfoodonlythreepeoplecame.6. hadbetterhavedone用于事后的建议,含轻微责备的口吻,意为“当时最好做了某事“Ihadbetterhavestartedearlier.Step6Summary用法请求/许可可能/推测义务/职责意图/打算意愿/愿意意志/决心才能/能力can/couldmay/mightshall/shouldwill/wouldmustoughttoStep7ApplyingtherulesFinishpartBonpage49
