Unit 4 Exploring literature Grammar and Usage 学案-2022-2023学年高中英语牛津译林版（2020）必修第二册

Unit 4 Exploring literature Grammar and Usage（1） 学习目标 1、回顾上单元语法。 2、掌握本节语法结构。 教学步骤 一导（回顾旧知，以旧带新） 二议 阅读课本48页内容并总结规律 三展 语法解析 Task 1、can与could 1、表示能力(ability)，意思是“能，会，可以” can的过去式是could。如： To our surprise, she can drive a car but can't ride a bicycle. He could swim across the river when he was young. 2. 表不建议或请求他人许阿，用could表示更为委婉地提出请求，回答时仍用 can。如： Can/Could I share the room with you? Yes, of course you can. 3.can 表示可能性，常用于否定向和疑问向，在肯定句中意为“有时会，很有可能”。如： It can be as hot as 40 °C in my hometown in summer. Task 2、may 和might 1. 表示许可，比can/could更为正式。may的过去式是might, may多用于正式场合，might语气更委婉些。如： You may take this seat if you like. Might I ask a question? 2. 表示可能性。might 表示可能性较小。如： The phone is ringing. It may be Tom. He said he would phone me. It might be true. Task 3、shall 与 should shall 1、用于第一、第三人称疑问向中，表示征求对方的意见或向对方请示。 2、用于第二、第三人称陈述向中，表示说话人给对方的警告、威胁、 允诺或命令等。 3、用于条约、规定、制度、法令、合同中表示义务或规定。 4、用于第一人称的句子中，可以表示将来，意为“将要，会” should 1、表示试探性的推断，意为 “可能,应该" 2、与ought to都可表示义务、责任或劝告,意为“应该，应当” 3、在表示建议(suggest、advise)、命令（order、command）、要求 (require、request)等句子中常用should加动词原形，should也可省略。 Shall we begin the meeting? A group of students are waiting to see you outside. Shall they come in? You shall end up in prison if you continue to violate the law. Don't worry. You shall have the tickets for the games. No one shall take a book from the library without the permission of the librarian. We shall be on holiday at this time next week. They should be home by this time. You should/ought to make more efforts if you want to make greater progress. It is required that all the passengers (should) wear seat belts. Task 4、will与would 1.表示说话人的意愿或决心,will的过去式为would。如： I will/would never do that again. 2. 表示请求或建议，would语气更加委婉。如： Would/Will you please pass me the book? 3. 表示料想或猜想。如： My sister will go and buy the tickets for the game. 4. 表示习惯。will 表示现在的习惯，would 表示过去的习惯,意为“过去常常”。如： In fine weather he will often sit in the sun for hours. Task 5、must 1. 表示必要性。如： All passengers in the bus must wear seat belts. 2. mu