必修3unit1情态动词Grammar讲解.ppt

人教课标 高一 必修 3 Unit 1;Unit 1 Festivals around the world;Grammar;Modal verbs such as may, might, will, would, can, could, shall, should, and must are used for many purposes. Find the sentences in the reading passage that use modal verbs. ;3 At that time people would starve if food was difficult to find 4 …or to satisfy the ancestor, who might return either to help or to do harm. 5 For the Japanese festival Obon, people should go to clean graves… 6 …this will lead the ancestor back to earth.;7 It is now a children’s festival, when they can dress up and go… 8 …the children might play a trick on them. 9 Festivals can also be held to honour famous people. 10 Harvest and Thanksgiving festivals can be very happy events.;11 In European countries, people will usually decorate … and will get together… 12 Some people might win awards for their… 13 At the Spring Festival in China, people… may give children lucky money in red paper. 14 These carnivals might include parades, dancing in the streets…;情态动词的语法特征;只作情态动词的 can / could, may / might, ought to, must 可情态可实义的　 need, dare 可情态可助动词的 shall / should, will / would 相当于情态动词的 have to, used to; 1) can的主要用法是： ? A.?表示体力或脑力的能力： ? e.g. The girl can dance very well. B.?表示说话的推测、事物的可能性等: e.g. Can the news be true? C. 在口语中, can可以表示请求或允许: e.g. Can I sit here? ;can表示“能够”时与短语be able to同义，但can只用于一般现在时或过去时，而后者可用于各种时态。另外，can表示个人有某种能力，而be able to表示某人通过努力、克服困难做成某事，相当于succeed in doing sth.；叙述过去事实时，最好用was / were able to，因为could只表示过去具有某种能力。;如： Can you understand the different kinds of English these people are using? Two years later, he was able to speak very good Chinese.;2) could 的主要用法是： A. could是 can的过去式, 表示与过去有关的能力和推测: e.g. We all knew that the young man couldn’t be a doctor. B. could可以代替can表示请求, 但语气较can客气、委婉:; e.g. Could you