初中英語中情態(tài)動詞的基本用法

2.2.表達“意愿”或“意志”。1.1.表達“義務(wù)”、“責任”。初中英語中情態(tài)動詞的基本用法：can,could表達“能力”。表示“許可”。有禮帽地提出“請求”。（用于疑問句）談?wù)摗翱赡苄浴薄．斨髡Z為事物時可以表示“驚異”。Wecanusethecomputernow,butwecouldn'ttwomonthago.Youcangonow.Couldyoubehereateighto'clocktomorrowmorning?Hecan'tbethemanager,forIsawhimgotoCanadayesterday.Whatonearthcanthismean?在表達“能力”時，可用beableto來取代can。要注意的是：可在beable

to前加肋動詞或情態(tài)動詞以表達更多的時態(tài)或情態(tài)，can或could前則不可。Nooneisabletodoit.（=Noonecandoit.）Weshallbeabletofinishtheworknextweek.Ihaven'tbeenabletofindanyjobs.maymight表示“允許”請求“許可”（用于疑問句）談?wù)摗翱赡苄浴盰oumaygohomenow.HesaidthatImightdrinksomebeer.MayIwatchTVthisevening?---MayIuseyoupen?---Yes,youmay.Hemay/mightcometomorrow.must.進行“肯定的推斷”。.其否定式mustn't表示“（說話人）禁止……，不準……'用來代替maynot表示“不許可”。Everybodymustobeytherules.Imustgonow.Thisworkmustbefinishedassoonaspossible.TheChineselanguagemusthavethelargestnumberofspeakers.Youmustn'tlendthebooktoothers.在表示“客觀需要”時，用haveto而不用must。另外可在haveto前加肋動詞或情態(tài)動詞以構(gòu)成更多的形式。must前則不可。Youdon'thavetoworryaboutthat.Hehadtospendhischildhoodinhardwork,helpinghisfatherontheirsmallfarm.Thestudentsoftodaywillhavetohowtousethecomputers.shallshould表示“必要性”。征求“意見”或“看法”，請求指示。主語為二、三人稱時，表達說話人強烈的意志和決心，有威脅或震懾聽話人的作用。Weshouldbestrictinallourwork.WhereshallIwaitforyou?Shallwestartthemeetingnow?Tellhimthatheshallhavethebooktomorrow.YoushalldoasIsay.Youngpeopleshouldlearnhowtousecomputers.在表示“必要性”時，可用oughtot來代替shall，語氣更正式一些。willwould1.表示“必然性”。3.詢問對方的意愿或提出請求。（用于疑問句）Fishwilldieoutofwater.Everydayshewouldgetupat6:00andlightthefire.Iwilltellyouallaboutit.We'llhelphimifheasksusto.Iwon'tgohomenow.IpromisedthatI