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1、语法点集中攻坚 单元要点大本营 单元一法练写作 It must belong to Carla.Unit 8 情态动词表示推测的用法 情态动词可以表示说话的语气，本单元我们主 要学了must，might，could，can等情态动词表示推 测的用法。表示推测时，要根据肯定句、疑问句或 否定句的不同句式选用不同的情态动词。 语法点集中攻坚 must 用于肯定句，意为“一定，肯 定”，表示有把握的肯定推测 。 Alan has been in China for several years. He must be a big boy now.艾伦在中国好几年了 ，现在他一定是个大男孩了 。 can
2、 多用于否定句或疑问句中，意 为“可能；会”，表示可能性较 大的推测。cant可用于对must 表示的肯定推测进行否定。 That cant be Maryshes in New York.那不可能是玛丽 她在纽约呢。 might/ could 用于肯定句，意为“有可能， 也许”，表示把握不大的推测 。 This volleyball might/ could be Toms. He is looking for his volleyball.这个排球可能是汤 姆的，他正在找他的排球。 拓展 表示对现在情况的推测用“情态动词do”；表示对 正在发生的事情的推测用“情态动词 be doing”；
3、 表示对过去或已完成事件的推测用“情态动词 have done”。 eg：She might be in the classroom now. 她现在可能在教室里。 Its ten oclock. He must be having class. 十点钟了，他一定在上课。 She is crying. She must have known the bad news. 她在哭，她一定已经知道了这个坏消息。 典例 Look! It _ be David in the classroom. It _ be him. Because I saw him in the library a moment
4、 ago. (广安) Amay；mustnt Bmust；cant Ccan；cant Dmustnt；can 【点拨】句意：看！一定是大卫在教室里。 不可能是他。因为刚才我在图书馆看到他了。表示肯定推 测用must；表示否定推测用cant。 B 1(威海)Is that woman your head teacher? No, it _ be her. Our head teacher is in her office. Amustnt Bcant Cneednt B 【点拨】本题用语法判定法解题。mustt一定不要； cant不可能；neednt不必。根据后一句校长在她的办公室 里可知，不
5、可能是她。故选B。 一、单项选择 2(中考长沙) Whos singing in the garden? It _ be Mr. Brown. He always practices singing at this time. Amust Bcant Cneed 【点拨】 must be 一定是，表示肯定的推测。 A 3(聊城)Will Karen come to our party? She hasnt decided yet. She _ come. Aneed Bmust Cmay Dhas to C 【点拨】本题用语法判定法解题。need需要；must必 须；may可能；have to
6、不得不。由她还没有决定，说明她 可能来。故选C。 4Where is Tom? I cant find him. Im not sure. He _ books in the library now. Amust read Bmust be reading Cmight read Dmight be reading D 【点拨】由Im not sure. 可排除A、B两项，再由now可 知选D。 5(中考杭州)If you _ smoke, please go outside. Acan Bmay Cmust Dmight C 【点拨】题干的意思是“如果你一定要抽烟，请到外面去。 ” 二、按要
7、求完成句子 6The book must be Toms. (改为同义句) The book _ _ _ _ 7It might be a football. (用basketball改为选择疑问句) _ it be a football _ _ _？ must belong to Tom Mightor a basketball 8The man with glasses must be our English teacher.(改 为否定推测) The man with glasses _ _our English teacher. cant be 【点拨】must be表示肯定推测，否定
8、推测用cant be表 示。 9Something must be wrong with my bike.(改为同义句) _ must be _ _ with my bike.There 【点拨】考查“There must be不定代词形容词其 他”结构。 something wrong 10My wife is playing games with my son.(改为肯定推 测) My wife _ _ _ games with my son. must be playing 【点拨】 “情态动词mustbedoing sth.”表示对正在 发生的事情进行肯定推测，意为“一定正在做某事”。
9、 返回 单元要点大本营 用括号内所给词的适当形式填空 Our neighborhood _1(use)to be very _2 (quietly)However，these days，strange _3(thing) are happening in our _4(neighbor) and everyone _5(be)nervous. Victor，a teacher at my school，was _6 (worry)When he was_7 (interview) by the local newspaper，he said，“Every night we hear stran
10、ge noises outside our window. I think it_8 (must) be teenagers _9(have) fun.” His neighbor Helen thought it used quiet things neighborhood is worriedinterviewed must having _10(can) be a dog at first，but she couldnt see a dog or anything else，either. Different people have different ideas about this，
11、but they are sure there must be something _11 (visit) the homes and having too much fun _12 (create) fear. What could it be? could visiting creating 返回 “三步逻辑推理法” 写 推理性作文 即根据已知的事实或 者依据， 采取逻辑推理 法来陈述主观的判断，从 而完成书面表达的过程。 第一步：细读并分析 材料， 找出事实和结果 之间的逻辑关系； 第二步：形成明确的 推理结果； 第三步：最终完成逻 辑推理过程， 做到简洁 、清楚和可信。 假如你假设你们
12、班上有位同学捡到一个背包 ，请你根据所提供的材料，进行全面客观的推测 分析，看背包可能是谁的。所提供的线索如下： There is a photo of Jay Chou in the backpack. There is a hair band in the backpack. There is a basketball in the backpack. 要求：80词左右。 In my opinion, the backpack must belong to_ 单元一法练写作 In my opinion，the backpack must belong to Liu Fang. First，
13、 Liu Fang likes Jay Chou very much. So she might put a photo of Jay Chou in the backpack. But Li Shan likes Jackie Chan very much. Second， Li Shan has short hair and Liu Fang has long hair. SoLiu Fang may have a hair band but Li Shan cant have one. Third， there is a basketball in the backpack. Liu F
14、angs favorite sport is basketball, but Li Shans favorite sport is baseball. So the backpack must be Liu Fangs. It cant be Li Shans. 范文: 本文较好地运用了“三步逻辑推理法”。作 者在认真阅读和分析材料的基础上，找到了 backpack中的a photo, a hair band and a basketball和 Liu Fang，Li Shan之间的逻辑关系，推理的过程清 楚，逻辑性强，可信度高。 本文的添彩点: 开头阐述观点，并运用must表示推测。 运用First, Second, Third等词逐条分析推 测的原因， 条理清楚。 So一词引出结论。 名师点评： 返回
