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1、Unit 8It must belong to Carla.,第三課時(Grammar Focus4c)單元同步語法精講精練,情態(tài)動詞must,can/could,may/might表示推測時,要根據(jù)肯定、否定或疑問的不同形式選用不同的情態(tài)動詞。 “情態(tài)動詞do sth.”表示對現(xiàn)在事情的推測;“情態(tài)動詞be doing sth.”表示對正在發(fā)生的事情的推測;“情態(tài)動詞have done sth.”表示對過去或已完成事情的推測。 eg:They must be in the classroom now.他們現(xiàn)在一定在教室里。 Peter may/might have been hurt in
2、the car accident.彼得可能在車禍中受了傷。 肯定推測 must用于肯定句,意為“準是,一定”,后面接動詞原形,表示對現(xiàn)在較有把握的推測。 eg:Ive had no sleep for 48 hours.我已經(jīng)48小時沒睡覺了。 You must be exhausted.你一定筋疲力盡了。 【注意】mustnt表示“禁止,絕不允許”。,may,could,might意為“可能,也許”,表示可能性較小的肯定推測。 eg:You may be right.你可能是對的。 He could/might be running for exercise.他可能正在跑步鍛煉。 can用在
3、肯定句中,表示理論上的可能性。 eg:Smoking can cause cancer.吸煙有可能引發(fā)癌癥。 否定推測 表否定推測時,cant/couldnt語氣最強,指“不可能”,帶有驚異、懷疑的感情色彩。 eg:The story sounds reasonable,but it cant be true.這個故事聽起來合情合理,但不可能是真的。 may not/might not/could not表示不太有把握的否定推測,意為“可能不(會)是”。 eg:He could not/might not be at home.Im not sure.他可能不在家,我不確定。,疑問句中的推測
4、疑問句中的推測,常用can或could,意為“可能”。 eg:There is someone outside.Who can it be?外面有人,會是誰呢?,句型:“Whose一般疑問句?” “Whose名詞一般疑問句?” 答語:使用名詞所有格或物主代詞來回答。 使用belong to sb.結(jié)構(gòu)來回答。 eg:Whose is this umbrella?/Whose umbrella is this?這把雨傘是誰的? Its Marys./It belongs to Mary.是瑪麗的。,一、根據(jù)句意,從方框中選擇合適的情態(tài)動詞填空。,1Tom has gone to Beijing.
5、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、單項選擇。 5I wonder if this s
6、mart phone is Marys.(2015,蘭州) 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.(20
7、15,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,每空一詞。 9The beautiful coat is Mikes_sisters(對畫線部分提問) ________ ___ the beautiful coat? 10The English book must be Sallys.(改為同義句) The English book must _______ ___ Sally. 11她不可能正在實驗室等著你。(翻譯句子) She _____ __ ___________ for you in the ___________ 12你昨晚熬夜了,現(xiàn)在一定困倦了吧。(翻譯句子) You ______ __ ________ now after your staying up late yesterday.,Whose is,belong to,cant be waiting,laboratory,must be sleepy,