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1、高一英語情態(tài)動詞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”Itcanbequietcoldhereatnight.(3.)請求許可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)動詞+do/be表現(xiàn)在情態(tài)動詞+bedoing表現(xiàn)在進(jìn)行、將來情態(tài)動詞+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詞必須根據(jù)陳述句中去掉表推測的情態(tài)動詞，改為陳述客觀事實(shí)的陳述句中的謂語動詞來判斷（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，表征求對方意見Henryiswaitingoutside.Shallhecomein,sir?(2.)用于二、三人稱，表說話者對主語的命令、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
8、resho
