浙江专版2017秋九年级英语全册Unit8ItmustbelongtoCarla语法小专题习题新版人教新目标版.doc

Unit 8 It must belong to Carla单元语法小专题(Grammar Focus)语法精讲1情态动词表示推测的用法在情态动词中，must，can，could，may，might都可以用来表示推测。1表示肯定推测(1)must表示把握性极大的推测，意为“准是；一定”。must只用于表示对现在的情况进行肯定推测。如：The hair band must be Lucy's.这个发带肯定是露西的。The light is on.She must be at home.灯亮着，她一定在家。(2)can表示理论上的可能性，意为“可能”。如：Smoking can cause cancer.吸烟可能导致癌症。(3)may表示对现在把握不大的推测，意为“也许；可能”。如：That story may be true.那个故事也许是真的。I don't know where Anna is.She may be in the bookshop.我不知道安娜在哪儿。她可能在书店。(4)could和might也表示一种不确定的猜测，通常用于表示过去的猜测。在某些场合，为了使语气更加委婉，可用could和might代替can和may。如：The coat might be hers.I saw her wearing it yesterday.这件外衣可能是她的，我昨天看见她穿了。I might come back at 7 o'clock，but I'm not quite sure.我可能在7点回来，但我不是很确定。We saw something in the sky last night.It could/might be a UFO.昨天晚上我们看见天空中有个物体。它有可能是一个不明飞行物。2表示否定推测(1)can't/couldn't表示把握很大的否定推测，意为“不可能”。如：The man can't be Mr.Green.He has gone to London.那个人不可能是格林先生，他去伦敦了。Mike couldn't finish the work so soon.迈克不可能这么快就完成那项工作了。(2)may not和might not表示把握性不大的否定推测，意为“也许不；可能不”。如：He may/might not come here tomorrow.他明天可能不来这里。3表示疑问推测在疑问句中表示推测，用can或could。如：Whose can the cup be? Can it be Li Kai's? 那个茶杯能是谁的呢？是李凯的吗？【拓展】“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：Peter may/might have been hurt in the car accident.彼得可能在车祸中受了伤。The old man can be walking in the park.那位老人可能正在公园里散步。语法精练.从括号内选出正确的单词填空。1The old car can't(must/can't) belong to Frank.He bought his car last Tuesday，and it is quite new.2The dictionary might(can't/might) be Lisa's.She has a dictionary like this.3Even the cleverest student can't answer the question，so it must(must/could) be very hard.4His cousin may(may/must) go to the movies with us this evening，but he isn't very sure.5Oh，it's raining hard.Be careful! The road must(must/might) be wet.根据汉语意思完成句子，每空一词。6她不可能正在等你。She can't be waiting for you.7她的表准是停了。我去叫她。Her watch must have stoppedI will go and call her.8他喜欢读书。现在他一定是正在图书馆读书呢。He likes reading.Now he must be reading in the library.9你走了那么长的路，一定饿了吧。You must be hungry after your long walk.10你最好去问那位警察，他一定知道去邮局的路。You'd better ask the policeman.He must know the way to the post office.