人教九年级英语下册Unit8 Grammar Focus[4] 课件.pptVIP

Unit 8;Review;--- Whose volleyball is this? --- It must be Carla’s. She loves volleyball. --- Whose book is this? --- It must be Mary’s. J.K. Rowling is her favorite writer. --- Whose hair band is this? --- It could be Mei’s. ;--- Whose notebook is this? --- It must be Ming’s. It has her name on it. --- Whose French book is this? --- It could be Carol’s. She studies French. --- Whose guitar is this? --- It might belong to Alice. She plays the guitar. --- Whose T-shirt is this? --- It can’t be John’s. It is too small for him.;must; 表示推测的情态动词 在英语中，表示对某件事物的确定程度，即表示推测的时候，我们通常会用到以下情态动词: must, might, could, may, can’t, couldn’t。 ; 一. can和could的区别和用法 1. can表示体力和脑力方面的能力, 或根据客观条件能做某种动作的“能力”。 　 Can you speak English？　　 　 can用在否定句和疑问句中时有时表示说话人的 “猜测”或 “不肯定”。 Can the news be true？ 　 (在日常会话中, can可代替may表示“允许”, may比较正式); 2. could 是 can的过去式, 表示过去有过的能力和可能性, 还有怀疑和不肯定的意思(在否定和疑问句中)。 She couldn’t skate when she was five years old.　 （能力） At that time we thought the story could be true. （可能性） could用来提问, 是有礼貌的请求 Could.... Please? 语气较为婉转。 Could I speak to Mr. Smith, please?;二. might和may的区别和用法: 1. may的用法: 　 a. 表示”允许”或”请求”。 May I come in？ 在使用这一用法时需注意: may表示“允许”的否定形式是must not, 意思是“不应该、不许可”。 　—May I take this book out of the reading room? 　—No, you mustn’t.;b. 表示说话人的猜测，认为某一事情“或许”或“可能”发生。　 He may know the answer. c. may用在感叹句中可表示祝愿、愿望。 May you succeed. 祝你成功。 May you have a pleasant journey. 一路平安。 ; 2. might的用法: a. might可以代替may, 表示现在时间的动作，但语气较为婉转客气或更加不肯定。 　 Might I offer a suggestion？ 　 b. might用来表示现在时间时, 还可表示”规劝”。 　 You might pay more attention to spoken English. ; 三. must与have to的区别 　 have to比较强调客观需要, must着重说明主观看法，另外have to能用于更多时态。比较下面的句子： My brother was seriously ill, so I had to call the doctor in the middle of the night. (客观上需要做这件事) He said that they must work hard. （主观上要做这件事）; 有时两者都可以用, 意思差别不大。 We must / have to leave n