新概念2册第41课练习

新概念2第41课练习题一、用must,haveto,hadto填空1、youtellusifyou`regoingtocome.thenwewon`tbeworriedaboutyou.2、Itwasverylatelastnight.therewasnobus,soIgohomebytaxi.3、Hewearglasses,evenwhenheplaysbasketball.4、Tellhimthatheturnoffallthelightsbeforeheleaveshome.5、Youcomeandhavealookatournewhousesomeday.6、Wecollectaparcelfromthepostofficeyesterday.7、Idrivetowork,becauseouruniversityisalongwayfrommyhome.8、TheteachersaidthatallthehomeworkbedonebyMonday.9、Passengersshowtheirticketswhenaskedtodoso.10、Youdoityourself.Nobodycanhelpyou.二、用can或must填空Thisisastreetcrossing.Thereareredandgreenlightsateachcorner.Driverswatchthelightscarefully.Whenthereisagreenlight.Thecarsgoon.Whenthereisaredlight,thecarsstop.Theywaituntiltheredlightchangestogreen.Thentheyproceed.Sometimescarswanttoturnrightorred.Buttheywaituntilthegreenlightisshowingiftheywanttoturnleft.Somepeoplearecolour-blind.Theynotseethedifferencebetweenredandgreen.Thesepeoplenotdrive,orelsetherewillbeanaccident.Wekeepourstreetssafe.情态动词的用法1、need的用法1）作情态动词的用法，用于否定句中，表示“不必”，也用于表示否定意思的句子中，还可构成疑问句。2）作及物动词的用法，need表示需要，后面可以接名称、代词、不定式、动名词和复合宾语。2、haveto的用法1）haveto的意思接近must，但must强调说话人的意愿，而haveto强调客观上的必要性，常可以翻译为“不得不”，否定形式表示“不必”，haveto可以用于多种时态，must只有原形。