Unit 3 We should obey the rules Lesson 17--must用法

Unit3WeshouldobeytherulesLesson17must用法 (1)表示“必须，应该”，用must提问时，一般不用mustn’t回答，而用needn’t回答。-MustIfinishtheworkbeforedark?-No,youneedn’t.我必须在天黑前完成工作吗？不，你没必要。must的用法 (2)mustnot(mustn’t)表示强烈禁止，意为“不允许，一定不，不能，不可”（不要译为“不必”）Youmustn’tgettoschoollate.你上学一定不能迟到。(3)must在肯定句中可以表示“一定要，一定是，一定会”等意思，即表示不可避免性、肯定性、可能性、推定或揣测等意思。Youmustbetiredafteryourlongjourney.你走了这么远的路，一定很累。 辨析：must与havetohaveto往往可与must互换，但两者的意义和用法有些不同。(1)must表示说话人主观看法；而haveto强调客观情况迫使人不得不做某事。(2)must只能表示现在“必须”，表示过去的事情要用hadto。haveto有时态、人称和数的变化。 (3)must与haveto的否定意思不同。比如：Youmustn’tdothat.你千万不能做那件事。Youdon’thavetodothat.你不必做那件事。（相当于needn’t） 课堂小测验Individualactivity 一、请找出下列各句中的错误并改正过来。1.Theyhavegotlotsofhomeworkstodo.2.Whenyouacceptapresent,youmustusebothhand.3.Youmustn’tbreakanything.It’sbadlucky.4.Therearesomuchpeopleinthelibrary.5.ItwasverydifferentfromaChinawedding.homeworkhandsluckmanyChinese 二、用所给词的适当形式填空。1.I’mtootired.Let’sstop_______(have)arest.2.Hewenttoschoolwithout_______(eat)breakfastthismorning.3.Hecouldn’twait_____(eat)thecake.4.MustI____(do)itnow?5.Thewindowisbroken.Try______(find)outwhobrokeit.tohaveeatingtoeatdotofind Jimwenttoschoolwithout_______(have)breakfast.2.Childrenmustn’t_____(walk)acrosstheroadthemselves.3.Nobodycan_____(drop)littereverywhere.4.HenryandAlicewillget_______(marry)inMay.三、用所给动词的正确形式填空。havingwalkdropmarried 1.鲁比怎样能洗掉溢出的牛奶？HowcanRuby_______thespilledmilk?2.我的父母总是在晚饭后打扫卫生。Myparentsalways______________afterdinnereveryday.3.英国和加拿大的天气不一样。TheweatherinEnglandis____________thatofCanada.四、根据汉语意思完成句子。washupdosomecleaningdifferentfrom 4.在中国你必须用双手接受礼物。InChinayoumustuse____hands_______apresent.5.影迷们冲上前去与这位电影明星握手。Thefansrushedforwardto______________thefilmstar.bothtoacceptshakehandswith Completethepassagewiththewords.accept;drop;open;put;ride;show;take;takeoff;wear;bicycle;hair;litter;photos;shoes;wastebinInBritainyoucan't(1)___________________onthepavement.Peoplecan't(2)____________.Theymust(3)____________itinthe(4)____________.Childrencan(5)____________whentheygointosomeone'shouse,butadultsweartheirshoesinthehouse.Britishwomencan(6)____________,althoughmanypeople(7)____________ahatwhenit'scold.InBritainyoucan(8)____________ofpeople.Youcan(9)____________apresentwithonehand.Youcan(10)____________apresentimmediatelyonyourbirthday.rideyourbicycledroplitterputwastebintakeoffshoesshowhairweartakephotosacceptopen Lookatthesignsandguesswhattheymean.AroundthewordSignsaroundtheworld. Makenotesonwhatyoumust,mustn’torcando.1.Whatmustyouwear?2.Whatmustn’tyouask?3.Whatpresentsmustyoubring?4.Whatpresentsmustn’tyougive?5.Whatmustn’tyoudointhestreets?6.Whatmustyoudowhenyouvisitsomeoneathome? Thankyou!