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Unit 8It must belong to Carla.,第三课时(Grammar Focus4c)单元同步语法精讲精练,情态动词must，can/could，may/might表示推测时，要根据肯定、否定或疑问的不同形式选用不同的情态动词。 “情态动词do sth.”表示对现在事情的推测；“情态动词be doing sth.”表示对正在发生的事情的推测；“情态动词have done sth.”表示对过去或已完成事情的推测。 eg：They must be in the classroom now.他们现在一定在教室里。 Peter may/might have been hurt in the car accident.彼得可能在车祸中受了伤。 肯定推测 must用于肯定句，意为“准是，一定”，后面接动词原形，表示对现在较有把握的推测。 eg：Ive had no sleep for 48 hours.我已经48小时没睡觉了。 You must be exhausted.你一定筋疲力尽了。 【注意】mustnt表示“禁止，绝不允许”。,may，could，might意为“可能，也许”，表示可能性较小的肯定推测。 eg：You may be right.你可能是对的。 He could/might be running for exercise.他可能正在跑步锻炼。 can用在肯定句中，表示理论上的可能性。 eg：Smoking can cause cancer.吸烟有可能引发癌症。 否定推测 表否定推测时，cant/couldnt语气最强，指“不可能”，带有惊异、怀疑的感情色彩。 eg：The story sounds reasonable，but it cant be true.这个故事听起来合情合理，但不可能是真的。 may not/might not/could not表示不太有把握的否定推测，意为“可能不(会)是”。 eg：He could not/might not be at home.Im not sure.他可能不在家，我不确定。,疑问句中的推测 疑问句中的推测，常用can或could，意为“可能”。 eg：There is someone outside.Who can it be？外面有人，会是谁呢？,句型：“Whose一般疑问句？” “Whose名词一般疑问句？” 答语：使用名词所有格或物主代词来回答。 使用belong to sb.结构来回答。 eg：Whose is this umbrella？/Whose umbrella is this？这把雨伞是谁的？ Its Marys./It belongs to Mary.是玛丽的。,一、根据句意，从方框中选择合适的情态动词填空。,1Tom has gone to Beijing.He _ be at home now. 2There _ be a girl singing next door.Cant you hear her? 3The girl in the classroom _ be Maria.She called me from the library just now. 4We _ go to the Great Wall this winter，but Im not sure.,cant,must,cant,may/might/could,二、单项选择。 5I wonder if this smart phone is Marys.(2015，兰州) It _ belong to her._ is totally different from this one. Amustnt；Her Bcant；Her Ccant；Hers Dmay；Hers 6Harrys been driving all day. He _ be tired.(2015，杭州) AneedBcanCshallDmust,C,D,7Is that man Mr. Smith? It _ be him.He has gone to New York on business.(2015，天津) Amay not Bneednt Ccant Dmustnt 8Whats the matter with Tom？He has been absent for two days.(2015，河南) Oh！He _ be ill.Lets go and ask Ms. Brown. Acan Bneed Cmay Dwould,C,C,三、按要求完成句子，每空一词。 9The beautiful coat is Mikes_sisters(对画线部分提问) _ _ the beautiful coat? 10The English book must be Sallys.(改为同义句) The English book must _ _ Sally. 11她不可能正在实验室等着你。(翻译句子) She _ _ _ for you in the _ 12你昨晚熬夜了，现在一定困倦了吧。(翻译句子) You _ _ _ now after your staying up late yesterday.,Whose is,belong to,cant be waiting,laboratory,must be sleepy,
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