Unit 8 It must belong to Carla .语法精析精练+答案（暑假预习通用）

中小学教育资源及组卷应用平台 九全一册Unit 8语法精析精练 语法精析 情态动词的用法归纳 情态动词有can( could)),may( might)),must, shall(( should)),will(would),dare(dared), need( needed), ought to等。大部分情态动词无人称和数的变化,不能单独使用,必须与其后的动词原形一起构成谓语。 一、can, could 1.表示能力(体力、知识、技能)。 Can you lift this heavy box??(体力) Mary can speak three languages..(知识) Can you skate??(技能) 此时可用 be able to代替。can只有一般现在时和一般过去式;而 be able to!则有更多的时态变化。 I'll not be able to come this afternoon. 当表示“经过努力才能做成功某事”时应用 be able to,,不能用can。如: He was able to go to the party yesterday evening in spite of the heavy rain. 2.表示请求和允许。 —Can I go now? —Yes, you can. , you can't. 此时可与may互换。在疑问句中还可用 could,, might 1代替,不是过去式,只是语气更委婉,不能用于肯定句和答语中 —Could I come to see you tomorrow? —Yes, you can, (No, I'm afraid not. 3.表示客观可能性(客观原因形成的能力)。 They've changed the timetable, so we can go by bus instead. This hall can hold 500 people at least. 4.表示推测(惊讶、怀疑、不相信的态度),用于疑问句、否定句和感叹句中。 Can this be true? This can't be done by him. How can this be true? 二、may, might 1.表示请求和充许。 might比may语气更委婉,而不是过式。否定回答时可用cant或 mustn't,,表示“不可以禁止” —Might/May I smoke in this room? —No, you mustn't. —May/Might I take this book out of the room? —No, you can't/mustn't. 用“May.?”征询对方许可时比较正式和客气,而用“Can I...?”在口语中更常见。 2.用于祈使句,表示祝愿。 May you succeed! 3.表示推测、可能性(不用于疑问句) might不是过去式,它所表示的可能性比may小。 He may/might be very busy now. Your mother may/might not know the truth. 三、must, have to 1.表示必须;必要。 You must come in time. 在回答must引出的问句时,如果是否定的,不能用 mustn''t(禁止;不准),而用 needn't,don't have to((不必)。 —Must we hand in our exercise books today? —Yes, you must. , you don't have to/you needn't. 2.must是表达说话人的主观看法,而 have to J则强调客观需要。must只有一般现在时, have to有更多的时态形式。 The play isn't interesting. I really must go now. I had to work when I was at your age. 3.表示推测、可能性(只用于肯定的陈述句)。 You're Tom's good friend, so you must know what he likes best. Your mother must be waiting for you now. 四、must be// may be// might be// could be//can't be的用法 must be i语气强硬,“必须;一定”之意 may be// might be// could be i语气不确定,“可能”之意 can't be语气偏强硬,“不可能”之意 语法精练 ( )1.—Must we do it now —No, you _____ A.won't B.needn't C.can't D.don't ( )2.He at home, I'm not sure. A.may B. can't be C. may be D. must be ( )3.You to the meeting this afternoon if you have something important to do. A. needn't to come B. don't need come C. don't need coming D. needn't come ( )4.—May I pick a flower in the garden? — 。 A. No, you needn't B.Not,please C. No, you mustn't D. No, you won't ( )5. You'd better late again. A.don't B. not be C. not being D. won't be ( )6.—Can I leave this ... ...