重庆市梁平实验中学高中英语《Unit1 Learning》Grammar1课件 重庆大学版必修2.ppt

grammar modalverbs must may should will haveto studyingtherule 1 a it shot isn tit b yeah butitmayraintomorrow 2 a mayisitonthischair b no youmustn t a whynot b becauseitisbroken 3 a theflighttonewyorkshouldbeleavinginafewminutes b areyousure 4 a sally youshouldbecarefulwhenyougooutatnight b ok iwill 5 a ihavejustwalked5kilometers b youmustbeverytirednow 6 a willyougivethistoelle please b withpleasure 7 a it srainingcatsanddogsoutside b really thenihavetotakeanumbrellawithme 8 a mustihandinthehomeworknow b no youdon thaveto youmayhanditintomorrowmorning 9 a whenarewegoingtoleavethehotel b wemustleavethehotelbefore6 00pm 总结 1 must与haveto的区别haveto比较强调客观需要 must着重说明主观看法 另外haveto能用于更多时态 比较下面的句子 wehadtobethereat10 00 有时两者都可以用 意思差别不大 e g wemust havetoleavenow must在表示说话人对事物的推测时候要注意它比may肯定得多 相当于汉语的 一定 或 准是 只有在肯定句中能这样用 thismustbeyourroom 在回答由must引起的问题时 如果是否定的答复 不能用mustn t 而需要用needn t或don thaveto 因为mustn t是 一定不要 的意思 2 may的用法 a 表示 允许 或 请求 e g mayicomein 在使用这一用法时需注意 may表示 允许 的否定形式是mustnot 意思是 不应该 不许可 e g mayitakethisbookoutofthereading room no youmustn t b 表示说话人的猜测 认为某一事情 或许 或 可能 发生 e g hemayknowtheanswer c may用在感叹句中可表示祝愿 愿望 e g mayyousucceed 祝你成功 mayyouhaveapleasantjourney 一路平安 3 should是shall的过去式 它可以用于过去时态中 但更多的是用作情态动词 意思是 应当 应该 用来表示义务或责任 此时 它不再局限于和第一人称的代词连用 而是三种人称都能使用 例如 youshouldanswermyquestioninenglish 你应当用英语回答我的问题 theyshouldn tbesocareless 他们不该如此粗心 it sraininghard youshoulddriveslowly 雨下得很大 你开车要慢些 should还可以用在提供帮助 提出建议 要求 给予指示的句子中 例如 shouldihelpyoucarrythebasket 要不要我帮你提篮子 whatshouldidoforthem 我应当为他们做些什么 应当注意的是 当should表示上述两种意思时 要重读 4 will情态动词aux 客气提问 是否愿意 好吗wordthatyousaywhenyouaskapolitequestion willyoupassthesalt 请你把盐递给我 好吗 willyoupleasegivehimamessagewhenyouseehim 你见到他时捎个口信给他好吗 won tyoucomeinandhavealittletea 要不要进来喝点茶 willyoupleaselendmeyourrubber 请借给我你的橡皮好吗 表推测 1 must 一定 只用于肯定句中 helookssopale hemustbeill 2 can could用于肯定 否定 疑问句中 itcan tbemr wang hehaslefthere 3 may might可用于肯定 否定句中theremaybesomedangerousanimalsontheisland 4 should 想必 theyshouldbetherebynow 5 如果对过去发生的事情的推测要用完成时 someonemusthaveopenedthecage thelioncouldn thaveescapedonitsown 准是有人把笼子打开了 狮子不可能自己跑出来 一般疑问句的肯 否定回答 1 canyou 2 mayyou yes ican yes imay no ican t no imustn t 3 mustyou 4 needyou yes imust yes imust no ineedn t no ineedn t no idon thavetono idon thaveto could might would等过去式用在疑问句表语气委婉时 其回答要用原形 couldyoutellmewhat sthematterwithyou yes ican sure certainly ofcourse findingtherule givingadvicesayingthatsomethingisnecessarypolitelyaskingsomeonetodosomethingaskingsomeoneforpermissiontodosomethingsayingthatperhapssomethingwillhappen 4 7 6 2 1 6 sayingthatsth willalmostcertainlyhappen aslongasnothingunexpectedstopsit7 expressinganopinionaboutsomethingthatthespeakerisnotsureabout 8 expressingobligation 义务 andduties 9 expressingneed 3 5 8 9 a dowehavetofinishthisjobtoday b yes you 2 ifitisraining you takeanumbrellawithyou 3 excuseme but iaskyouaverypersonalquestion 4 ican tbesure buti belatethisevening sodon twaitforme applyingtherule completethefollowingsentenceswithmay should must willorhaveto must should must may may 5 a youdon t returnthebooknow youcankeepituntilnextmondayifyoulike b thankyouverymuch 6 thetrain behereanyminutenowbutyouneverknow 7 excuseme but youpleasestayoffthegrass he stayathomebecausehisrightlegisbroken listen youreally givethistomary it sveryimportant haveto should will hasto must 1 askyourteacherforpermissiontoleaveschoolearlytomorrow applyingtherule makesentencesbyusingmay should mustwillorhaveto basedonthefollowingsituations mayileaveschoolearlytomorrow 2 adviseyourfriendtostudyharder youshouldworkharder 3 youareadoctor tellapatientthatitisreallynecessarytotakeallthemedicine 4 someoneasksyouthetime youhaven tgotawatchbutyou resureit steno clock youhavetotakeallthemedicine itshouldbeteno clock 5 someoneaskyouifitwillraintomorrow youdon tknow butitispossible 6 youphoneisringing youarebusy politelyaskafriendtoanswerit ihavenoidea butitmayraintomorrow willyoupleaseanswerthephoneforme theplaneshouldarriveat12 00pm ifnothinggoeswrong 7 youareastewardess apassengerwantsyoutotellhim herthearrivaltimeinparis youtellhim hertheplanewillalmostcertainlyarriveat12 00pm ifnothinggoeswrong 8 yoursonisaloneathome soyoutellyourfriendsatthepartyyouneedtogohomenow i mafraidihavetoleavenowbecausemysonisaloneathome self check 1 iamnotsure butithinkbob cometoseemetoday 2 developedcountriesthinkthatdevelopingcountries acceptglobalization 3 ifyouneedanyhelp i bethefirstonetogiveittoyou 5 allofus learntobepoliteandshouldnotsmokeortalkloudlyinapublicplace may must will should 6 let sgeteverythingreadynow ourguests comeatanytimefromnowon 7 look thelightison bob beintheroomnow 8 ihopejohn cometomorrow ihavesomethingimportanttotellhim 9 adults notberudetochildren otherwise they berudetoadults 10 isawmaryinthebookstoreafewminutesago she notbeintheclassroomnow may must will should will can t 1 incrowdedplaceslikeairportsandrailwaystations you takecareofyourl