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1、高一英語情態(tài)動(dòng)詞1.can(1.)能力HecanspeakfluentEnglish.區(qū)別can與beableto的用法:①can只有一般現(xiàn)在時(shí)與一般過去時(shí);beableto有各種時(shí)態(tài)②beableto表示經(jīng)過努力設(shè)法做成某事,相當(dāng)于managetodo/succeedindoingEveryonewasabletoescapefromtheburningbuilding.(2.)客觀可能性(肯定句)“有時(shí)會(huì)”Itcanbequietcoldhereatnight.(3.)請(qǐng)求許可could(委婉語氣)CanIhavealookatyournewpen?--Cou
2、ldIuseyourcomputertomorrow?--Yes,youcan./No,I’mafraidnot.(4.)用在否定句、疑問句中表懷疑,驚訝等Canitbetrue?Howcanyoubesocrazy?can’thelpdoingsth.忍不住做某事,情不自禁做某事Ican’thelpthinkingheknowsmorethanhehastoldus.cannot/never…too再…也不為過,越…越好Youcannotbetoocarefulwhenyoudriveacar.2.may(1.)請(qǐng)求許可might(委婉語氣)--MayIsmok
3、ehere?--Yes,youmay./No,youmustn’t.(2.)可能性Johnisabsent.Hemaybeill.Itmaybenottrue./Itcan’tbetrue.(3.)用于祈使句中表祝愿Mayyousucceed!may/mightaswell(dosth.)做某事倒也無妨,只好做某事Ifnooneelsewantsit,wemightaswellgiveittohim.maywelldosth.完全可能Theymaywellwin.3.must(1.)必須Soldiersmustobeyorders.區(qū)別must與haveto的用法
4、:①must表示主觀看法,haveto表示客觀需要IfeelImustcallyoutothankyouforyourhelp.It’srainingheavily.Youhavetotakeanumbrella.②must無時(shí)態(tài)變化,haveto的時(shí)態(tài)隨have的變化③否定形式的含義不同:mustn’t表示禁止,don’thaveto表示不必Youmustn’ttakethebookoutofthereadingroom.Youdon’thavetotellhimthetruthifyoudon’twantto.④回答must問句--Mustwehandinou
5、rexercisebooktoday?3--Yes,youmust./No,youdon’thaveto/needn’t.(2.)偏偏,偏要Mustyoushoutsoloudly?Ifyoumust(dosth.)(表示雖不贊同但可允許)如果你一定要做某事--MayIsmokehere?--Ifyoumust,chooseaseatinthesmokingsection.歸納:can,could,may,might,must都可以表推測肯定句→must,may,might否定句→can’t,couldn’t(不可能),maynot(可能不)疑問句→can,cou
6、ld情態(tài)動(dòng)詞+do/be表現(xiàn)在情態(tài)動(dòng)詞+bedoing表現(xiàn)在進(jìn)行、將來情態(tài)動(dòng)詞+havedone表過去如何運(yùn)用在反意疑問句中:反意疑問部分中的助動(dòng)詞必須根據(jù)陳述句中去掉表推測的情態(tài)動(dòng)詞,改為陳述客觀事實(shí)的陳述句中的謂語動(dòng)詞來判斷(可根據(jù)時(shí)間狀語)。(1.)Hemayknowtheplan,________________?(2.)Hemusthavelivedhereforalongtime,____________________?(3.)Hecan’thaveleftyesterday,___________________?4.shall(1.)用于一、三人
7、稱,表征求對(duì)方意見Henryiswaitingoutside.Shallhecomein,sir?(2.)用于二、三人稱,表說話者對(duì)主語的命令、規(guī)定、允諾、威脅、決心等Thestudentsshallwearuniforms.Youshallgetananswerfrommetomorrow.5.should(1.)應(yīng)該,表示勸告、建議,相當(dāng)于oughtto(語氣稍強(qiáng),客觀情況)Asstudents,weshouldworkhard.Everycitizenoughttoobeythelaw.(2.)按道理應(yīng)當(dāng)Therearemanyhotelsthere.The
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