人教版九年级Unit8 情态动词表推测讲解.ppt

情态动词表推测(一) 情境导入 She must be a teacher. My mother could be cooking now. He might have finished his homework. 知识讲解 e.g. He must be American. The book could be Mike’s. She may be a Chinese. She can’t be a teacher. 一、表推测的情态动词：can, could, may, might, must 可能性：must ＞could / may / might ＞can’t 知识讲解 e.g. She must arrive before 5. Paul might go to Shanghai next month. 1. 情态动词 + 动词原形 二、情态动词表推测的不同时态 2. 情态动词 + be / do sth. e.g. Lisa must be in the hospital. She is ill today. Smoking may cause cancer. → 将来 → 现在 / 一般 知识讲解 e.g. Maria might be listening to tapes now. The man could be running to catch a bus. 3. 情态动词 + be doing 4. 情态动词 + have done sth. e.g. It must have rained last night. The ground is wet. Can he have gotten the book? →现在正在发生 → 过去 / 已完成的事情 典例精析 1. —(安徽中考)Do you have any plans for this Sunday? —I’m not sure. I ______ go to the countryside to see my grandmother. A. can　 B. must 　C. may 　D. need C 典例精析 2. — What’s the matter with Tom? He has been absent for two days. — Oh! He______ to Beijing on business. A. can go B. may go C. may have gone D. must go C 典例精析 3. — Where is Bill? — He_______ in the library now. A. can read B. may read C. must read D. might be reading D 课堂小结 一、表推测的情态动词：can, could, may, might, must 可能性： must ＞could / may / might ＞can’t 二、情态动词表推测的不同时态 1. 情态动词 + 动词原形 → 将来 2. 情态动词 + be / do sth. → 现在 / 一般 3. 情态动词 + be doing → 现在正在发生 4. 情态动词 + have done sth. → 过去 / 已完成的事情 情态动词表推测(二) 情境导入 He must be a cook. You can’t know her. Can they win the match? 知识讲解 表推测的情态动词：can, could, may, might, must 可能性：must ＞could / may / might ＞can’t *情态动词表推测的三种句式 1. 肯定句 2. 否定句 3. 疑问句 知识讲解 ① must 一定，准时；(有把握) e.g. It’s 8 now. She must be late for class today. 1. 肯定句：must，may ，might ， could，can ② may 也许，可能；(把握不大) e.g. It may be Henry’s book. It’s on his d