Unit6SpaceandBeyondGrammar课件高二英语选择性

Unit6Period2Grammar课堂学习1Lookatthesentencesfromthereadingpassageandanswerthequestions.aMillionswatchedthatfirstlunarlanding...aware...ofthemanythingsthatcouldgowrong.bTheworldwentintoshock,mostpeoplehavingassumedthatthisspaceflightwouldbenomoredangerousthantravellinginanaeroplane.cIcanrememberthatdaysoclearly,watchingthetake-offonTVatschool,...dThesacrificeoftheChallengercallstous,remindingusthatwemustcontinuetoreachforthestars,...Review:modals1Whichsentencetalksaboutability?c2Whichsentencetalksaboutpossibility?a3Whichsentencetalksaboutnecessity?d4Whichsentencetalksaboutprediction?b5Whatothermodalsdoyouknow?Whatdotheyindicate?Will,may,might,haveto,shall,should,oughtto,need,dare...Nowlookformoresentenceswithmodalsinthereadingpassage.1.Withtheeyesofstudentsacrossthenationuponher,shemighthaveinspiredanentirelynewgenerationofastronautsandspacescientists.2.Buttherewasneveranydoubtthatmannedflightswouldcontinue,andon29September1988,thespaceshuttleprogrammeresumedwiththesuccessfullaunchofDiscovery.3.Thememoryofthosesevenwillliveforever,writteninthestars,inspiringustojointheminhumanity'sgreatestjourneyofexplorationanddiscovery.4.ThesacrificeoftheChallengercallstous,remindingusthatwemustcontinuetoreachforthestars,nomatterhowdistanttheymightseem.【语法讲解】情态动词情态动词本身有一定的词义，表示语气的单词。但是不能独立作谓语，只能和动词原形一起构成谓语。情态动词用在行为动词前，表示说话人对这一动作或状态的看法或主观设想。情态动词虽然数量不多，但用途广泛，主要包括下列单词和短语：can(could)、may(might)、must、haveto、will(would)、need、oughtto、dare(dared)、shall(should)。2.may,might(1)

表示请求和允许。might比may语气更委婉，而不是过去式。否定回答时可用can’t或mustn’t，表示“不可以，禁止”。

—Might/MayIsmokeinthisroom?我能在这屋里抽烟吗?

—No,youmustn’t.不可以。

用MayI...?征询对方许可时比较正式和客气，而用CanI...?在口语中更常见。(2)

用于祈使句，表示祝愿。

Mayboththebrideandgroomhavelongandhappylives.

祝新郎新娘白头偕老，幸福美满。(3)

表示推测、可能性（不用于疑问句）。might不是过去式，它所表示的可能性比may小。

Hemay/mightbeverybusynow.他现在可能很忙。(2)

must是说话人的主观看法,而haveto则强调客观需要。must只有一般现在时,haveto有更多的时态形式。

Hisplayisn’tinteresting,Ireallymustgonow.

他的比赛没意思,我现在必须走了。

IhadtoworkwhenIwasyourage.

当我是你这个年龄时我不得不工作。(3)

表示推测、可能性(只用于肯定的陈述句)

You’reTom’sgoodfriend,soyoumustknowwhathelikesbest.你是汤姆的好朋友,所以你一定知道他最喜欢什么。4.will,would(1)

表示请求、建议等,would更委婉。

Will/Wouldyoupassmetheball,please?

请把球传给我好吗?(2)

表示意志、愿望或决心。

Iwillneverdothatagain.

我再也不会这样做了。

Theyaskedhimifhewouldgoabroad.

他们问他是否会出国。5.should,oughtto(1)

should,oughtto表示“应该”，oughtto表示义务或责任，比should语气重。

Ishouldhelpherbecausesheisintrouble.

我应该帮助她，因为她有麻烦。

Yououghttotakecareofthebaby.你应该照顾婴儿。(2)

表示劝告、建议或命令。should、oughtto可通用，但在疑问句中常用should。

Youshould/oughttogotoclassrightaway.

您应该/应该马上去上课。

ShouldIopenthewindow?我应该打开窗户吗?(3)

表示推测

should,oughtto(客观推测),must(主观推测)。

Hemustbehomebynow.(断定他已到家)

他现在一定在家。

Heoughtto/shouldbehomebynow.(不太肯定)

他现在应该在家。(4)

should(表示可能)假如,万一

Ifyoushouldchangeyourmind,doletmeknow.

如果你改变主意,一定要告诉我。6.shall(1)

shall用于第一人称,征求对方的意见。

Whatshallwedothisevening?今晚我们做什么?(2)

shall用于第二、三人称,表示说话人给对方的命令、警告、允诺或威胁。

Youshallfailifyoudon’tworkhard.(警告)

如果你不努力工作,你就会失败。

HeshallhavethebookwhenIfinishit.(允诺)

我读完这本书后,他就可以拿到了。

Heshallbepunished.(威胁)

他将受到惩罚。2Readthepassageandchoosethecorrectmodals.On15October1997，theCassinispacecraftsetoutonamissiontoexploretheplanetSaturn.SogreatwasthedistancefromEarththatitwould/shallneedtotravelforalmostsixyearstoreachitsdestination.WhenitreachedSaturn,itsentbackamazingimagesoftheplanet’sfamousringsviewedinultravioletlight.CassinimadenumeroustripsaroundSaturnsoitcould/mustcollectdata.Overthefollowingyears,Cassinitooksome450,000imagesoftheplanetanditsmoons.Finally,on15September2017,CassiniwaspointedtowardsSaturnsothatitshould/wouldmeetafieryend.ScientistshaddecidedthatCassinicould/mustbedestroyedthisway,soitmust/wouldnotcollidewithanyofSaturn’smoons.Initsnearly20-yearmission,Cassiniprovidedsomuchinformationthatscientistscould/wouldnotprocessitall.Nowondersomanypeopletooktosocialmediatobiditgoodbye,saying,“Farewell,dearCassini!Weshall/shouldneverforgetyou!”3Lookatthepictureandtellastoryusingmodalswhereappropriate.Icouldn’tbelieveitw