情态动词考点归纳will,would1)用于表达意志或意愿。will指目前，would指过去。e.g.Iwillneverdothatagain.Theysaidthattheywouldhelpus.2)表达“祈求；提议”。用would比will委婉、客气些。e.g.Willyoupleasetakeamessageforhim?Wouldyoupleasepasshimthebook？3)表达习惯性动作，“总是”“惯于”，will指现在，would指过去。e.g.Fishwilldiewithoutwater.4)表达预料或猜测。e.g.Itwouldbeabouttenwhenhelefthome.5)表达规律性“注定”用will。e.g.Peoplewilldiewithoutwaterorair.can,could1)表达能力。e.g.Mygrandmaiswellovereighty,butshecanreadwithoutglasses.2)表达客观也许性。e.g.Accidentscanhappentoanydrunkendriver.3)表达祈求和容许。e.g.—CanIhavealookatyourdesign?—Yes,ofcourseyoucan.4)表达惊讶、怀疑、不相信态度。（重要用于否认句，疑问句和惊叹句）。e.g.Whatcanhebedoingatthistimeofnight?5)表达祈求，口语中常用could替代can,使语气更委婉。e.g.Couldyoupleasehelpmewiththisfurniture?may,might1)表达容许、许可。否认回答时，一般用mustn’t，“严禁、制止”。e.g.—MayIwatchTVaftersupper?—Yes,youmay./No,youmustn't.2)表达祈求、容许时，might比may语气更委婉；用MayI…？征询对方许可在语气上比较客气；用CanI…？征询对方意见更常见。e.g.—MightIuseyourtelephone?—Yes,please.—May/CanIgohomenow?—Yes,youmay/can.3)表达也许性推测，“或许，也许”，用might替代may时，语气显得愈加不愿定，用于陈说句中。e.g.Itmaybetrue.Shemayetomorrow.Hemighthavesomefever.4)may用于祈使句中表达祝愿。e.g.Mayyousucceed！must1)表达“必须；应当”。以must开头问句，否认回答常用needn’t或don’thaveto，必然回答用must。e.g.Youmustetoschoolontime.2)表达有把握推测，只用于必然句中。e.g.Youmustbeill.Icanseeitfromyourface.3)表达“非要；偏要”。e.g.Theyaresleeping.Mustyouplaythepianoatthistime？haveto表达“必须；不得不”，强调客观需要，有时态，人称变化。e.g.Ican’tseethingsclearly.Ihavetowearglasses.shall1)用于第一人称，表达征求对方意见。e.g.Whatshallwedonext？2)用于第一、三人称疑问句，表达说话人征求对方意见和向对方请示。e.g.Shallwebeginourlesson?Shallthedriverwait？3)用于第二、三人称陈说句，表达说话人给对方命令、警告、允诺和威胁。e.g.Youshallgowithme.Heshallbepunished.should1)表达劝说或提议，“应当”。e.g.Weshouldbestrictwithourselves.2)表达推测，“也许”或“应当”。e.g.Theyshouldhavearrivedbytwoo’clock.3)用于第一人称表达说话人一种谦逊、客气、委婉语气。e.g.Ishouldadviseyounottodothat.Youaremistaken,Ishouldsay.4)用在if条件句中，表达也许性很小，但也不是完全不也许。e.g.AskTomtoringmeupifyoushouldseehim.5)Why/how+should，表达意外，惊异，“竟会”。e.g.Whyshouldyoubesolatetoday？need表达“需要；必要”，用于否认句、疑问句中，只有目前时，其他时态用haveto对应形式替代。e.g.Youneedn’task