第三讲情态动词[语法规则再现]情态动词含义示例cancould(指过去时间)(1)表能力,意为“能,能够,会”(2)表可能(理论或逻辑判断)(3)表示请求(4)表示对现在状态或动作进行猜测(否定句或问句)①HecanspeakEnglishfluently.②Hecancompeteinthefootballmatchiftimepermits.③CanyouhelpmewithmyChinese?④Marycan'tbeintheclassroomnow.Sheisinjuredathome.maymight(1)表允许(2)表可能①ImaygohikingifIfinishmyhomework.②Itmayrainsoon.must(haveto表客观需要)(1)表必须(肯定句)(2)表揣测,意为“想必,准是,一定”①Imustgohomenow.②Mymothermustbeexhaustednow,becauseshewalkedalongtime.shouldoughtto(1)表责任或义务,意为“应该”(2)表推测,意为“照说应该,估计”①Youshoulddowhatyouareaskedtodo.②Childrenoughttobeabletoreadbytheageof7.shall在疑问句中征求意见(主语是I,we,he)Shallwegotothemuseumafterclass?willwould(1)表意愿(2)表请求(第二人称)(3)表过去的习惯①Iwilldoitwellforyou.②Wouldyoupleaseopenthedoor?③Hewouldswimwhenhewasyoung.[典型例题分析]1.(2019年青岛模拟)—WhatdoyouthinkofBetty?—Lovely,thoughshebenaughtysometimes.can[考查情态动词。句意:——你认为贝蒂如何?——很可爱,尽管她有时候会很调皮。can表示“有时候可能会”的意思。]2.(2019年兰州一月调研)I'mCaptainJohnBlanchard.YoubeMissHollis.Iamgladtomeetyouhere.must[考查情态动词。你一定是Hollis女士。根据语境可知此处要用must表示肯定的推测。][语法专项对练]单句语法填空1.—Can'tyoustayalittlelonger?—It'sgettinglate.Ireallymustgonow.Mydaughterishomealone.2.Itwassonoisythatwecouldnothearourselvesspeak.3.YoumustbeCarol.Youhaven'tchangedabitafteralltheseyears.4.Youmayfeelallthetrainingawasteoftime,butI'mahundredpercentsurelateryou'llbegratefulforwhatyoudid.5.Youmustbecarefulwiththecamera.Itcosts!6.Iwouldstayathomeratherthangoshopping.7.—Shallwehaveacupofteahere?—That'sagoodidea.8.—Wouldyouclosethewindowforme?—Certainly.9.ThemanwithacapmustbeTom'sfather.Ihaveseenhimbefore.10.Thetrafficisheavytoday;Imightarriveabitlate,socouldyousavemeaplace?11.Youshouldstudyharderthanbefore,becausethefinalexamiscoming.