1、单元语法归纳与练习,情态动词表示推测,1.对不同时态的推测,“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。如: You have studied for five hours.You must be tired. 你已经学习五个小时了,一定累了。 Our teacher must be marking our exam papers. 我们的老师一定在批阅我们的试卷。,2.肯定推测,(1)must用于肯定句,表示较有把握的推测,意为“准是,一定”,后面
2、接动词原形,表示对现在的推测。如:Our teacher must be in the office.我们的老师一定在办公室。 (2)may,could,might表示可能性较小的肯定推测,意为“可能,也许”。如:It may be a new species.它可能是一个新品种。He could/might be running for exercise.他可能正在跑步锻炼。 (3)can用在肯定句中,表示理论上的可能性。如:Smoking can cause cancer.吸烟有可能引发癌症。,3.否定推测,(1)cant表示有把握的否定推测,意为“不可能”。如:That cant be
3、Mary.Shes ill in hospital.那不可能是玛丽,她生病住院了。 (2)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”。如: He could not/might not be at home.Im not sure.他可能不在家,我不确定。,4.疑问句中的推测疑问句中的推测,常用can或could,意为“可能”。如:There is someone outside.Who can it be?外面有人,会是谁呢?,.根据句意,选择合适的单词填空 1.You (can/must) be tired after worki
4、ng for a long time without a rest. 2.Who is the woman over there?Is she Mrs.Smith?It (may/cant) be her.She is much taller. 3.Wheres Zhang Lei?Im not sure.He (could/need) be in the zoo. 4.What will the weather be like tomorrow?It (must/might) be windy or rainy.Im not sure. 5.Alice (must/cant) be work
5、ing now,because the light in her room is still on.,must,cant,could,might,must,.单项选择 ( )6.Lets go climbing,shall we?You be joking! Dont you know Im afraid of high places? A.must B.can C.may D.should ( )7.Weve ordered too much food.I eat any more. Never mind.Lets take it home.(2017温州)A.cant B.mustntC.
6、neednt D.shouldnt ( )8.When you are travelling,bring a map because it help you. (2017天津) A.cant B.mustntC.used to D.may,A,A,D,( )9.Must I stay here with you,Mum?No,you .You may go home now,but you go to the net-bar.(2017安顺) A.mustnt; neednt B.neednt; mustntC.must; need D.need; must ( )10.What will t
7、he weather be like tomorrow?It be rainy,cloudy or sunny.Im not sure.(2017西宁) A.must B.should C.cant D.might,B,D,.根据汉语意思完成句子 11.她不可能正在等你。She for you. 12.她的表准是停了。我去叫她。Her watch .I will go and call her. 13.他喜欢读书。现在他一定正在图书馆读书呢。He likes reading.Now he in the library. 14.你走了那么长的路,一定饿了吧。You after your long
8、 walk. 15.你最好去问那位警察,他一定知道去邮局的路。Youd better ask the policeman.He the way to the post office.,cant,be,waiting,must,have,stopped,must,be,reading,must,be,hungry,must,know,( )1.There are some people soccer in the park.(2017渝北) A.play B.plays C.playing D.to play ( )2.The little boy has just had lunch.He be hungry already. (2017临沂) A.must B.mustnt C.can D.cant,易错提醒: 1.句意:一些人正在公园里踢足球。there be sb.doing sth.是固定搭配,表示“有某人正在做某事”。 2.must一定,必须;mustnt禁止,不表示推测;can能,会;cant不可能。句意: 这个小男孩刚刚吃过午饭,他不可能已经饿了。,C,D,谢谢观赏！,
