Unit6 Space and beyond Period3 Using language 教案-2022-2023学年高中英语外研版（2019）选择性必修第四册

Unit6 Space and beyond Period3 Using language Topic Review:modals Teacher Teaching Aims: 1. Let the students know more about the usage of modals. 2. Guide the students to review and summarize the functions of modal verbs in different contexts. Teaching important Points: 1.Help the students to grasp the key points to use modals. 2.Guide the students to pay attention to pragmatic functions, learn to express their own views and expectations, and be able to use the expressions they have learned in real life. Teaching difficult points: 1. Help the students to grasp some key sentence patterns. 2. Guide the students to find and summarize the rules of modals. Teaching methods: Introduction method Teaching type: Grammar 课 时 two Teaching procedure: Teaching contents: Step1: Leading-in Step2: Step3: Summary 情态动词主要用以说明说话者的情感、态度和语气。情态动词不能单独作谓语,需要与实义动词原形一起构成谓语。 Task1: 情态动词用法 (1)can与could的用法 ①表示能力:can表示现在的能力，could表示过去的能力。can 表示能力时,有时可与 be able to 通用。 I can play basketball now,but I couldn’t when I was young.现在我会打篮球了,但小时候我不会。 ②表示请求或许可:could 语气比 can 委婉，回答时只能用can。 -Can/Could you lend me a hand? -Yes,I can. “你能帮我一下吗?” “可以。” ③表示推测,意为“可能”，多用于否定句或疑问句。 -Can he be in the reading room now? -No, he can't be in it.Because I saw him in the office just now. “他现在可能在阅览室吗?” “不,他不可能在(阅览室)。因为我刚刚在办公室看见他了。” ④表示理论上的可能性,意为“有时可能会”。 It can be quite cold here at night. 这里夜间有时可能会很冷。 Notes：can 与be able to表示“能力”时的区别 can 用于指现在,常表示自身具有的能力;be able to 用于各种时态,表示经过努力后所具有的能力。 The bus can carry 60 passengers. 这辆公共汽车能载 60 名乘客。(自身具有的能力) He was able to escape from the fire before the firefighters arrived. 他在消防队员到来之前从火灾中逃了出来。(经过努力后所具有的能力) (2)may与might的用法 ①表示征求对方的许可或允许。 -May I come in? -Yes，you may/can.(或No,you cant.) “我可以进来吗?” “是的，你可以进来。”(或“不行，你不能进来。”) You may go now. 你现在可以走了。 ②表示推测(把握不大),意为“可能”,多用于肯定句。might 比 may可能性更小。 He may come, or he may not. 他可能来，也可能不来。 It may/might rain this afternoon. You'd better take a raincoat.今天下午可能会下雨。你最好带件雨衣。 ③may用于祈使句,表示祝愿。 May you succeed!祝你成功! May you have