Module 4 Unit 3（同步课件）英语外研版九年级下册

仓颉之初作书盖依类象形故谓之文其形声相益即谓之字文者物象之本字者言孳乳而浸多也著于竹帛谓之仓颉之初作书盖依类象形故谓之文其形声相益即谓之字文者物象之本字者言孳乳而 Unit 3 Language in use Module 4 Are you familiar with these sentences? They are all from this module. 1. You must be careful of falling stones. 2. You mustn’t walk too close to the edge of the hill path because you might fall and hurt yourselves. 3. You should always wear proper clothes. 4. Bears might think our rubbish is food. 5. — Can we go rock climbing? — No, you can’t. Task 1 复习情态动词 6. You mustn’t go off on your own. 7. You may need some water. 8. We should hang the food in a tree tonight. 9. They can smell food from a long way away. 10. No one can run faster in the forest than a bear. 11. You mustn’t make any sudden moves or make a sound. And above all, you mustn’t run. 情态动词本身有一定的意义，但不能独立作谓语，只能与其后的动词原形一起构成谓语，表示说话人的情绪、态度或语气，用来表达建议、请求、可能或意愿等。情态动词没有人称和数的变化，情态动词后必须跟动词原形。常见的情态动词有：can, could, may, might, must, need, shall, will, should, would。 情态动词 Can you lift this heavy box? (体力) Mary can speak three languages. (知识) Can you skate? (技能) can, could 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。 ①表示能力(体力, 知识, 技能), 常用情态动词can和could表达。 如：I’ll not be able to come this afternoon. (一般将来时) 当表示“经过努力才得以做成功某事”时用be able to, 不能用can。如： He was able to go to the party yesterday evening in spite of the heavy rain. —Can I go now? —Yes, you can. / No, you can’t. —Could I come to see you tomorrow? —Yes, you can. (No, I’m afraid not.) 此时可与may互换。在疑问句中还可用could, might代替， 但could, might并不表示过去式，只是语气更委婉。它们 不能用于肯定句和答语中。如： ②表示请求和允许。如： They’ve changed the timetable, so we can go by bus instead. Exercising alone can be boring. ③表示客观可能性。如： Can this be true? This can’t be done by him. How can this be true? 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。 —Might / May I smoke in this room? —No, you mustn’t. —May / Might I take this book out of the room? —Yes, you can. (No, you can’t / mustn’t. ) may, might 用May I ...? 征徇对方许可时比较正式和客气，而用Can I ...?在口语中更常见。 ①表示请求和允许。might比may