Module 11 Unit 3-Language in use课件2023-2024学年外研版英语八年级上册

Unit 3 Language in use Module 11 Way of life Language practice You must say Mr or Mrs when you meet someone for the first time. You can take it away. You mustn’t break anything. You needn’t wait! 情态动词 　　情态动词是辅助动词,表示说话人的某种情绪、态度或语气,本身有一定的词义,不能在句中独立作谓语,必须与另一个动词一起构成谓语,没有人称和数的变化。 情态动词的特点 1. 不能单独作谓语，必须与动词原形连用 2. 没有人称和数的变化 Black Widow can use guns very well. She must be the most beautiful woman in the Avengers. But she can’t fight with her friends until the end. 3. 否定式构成是在情态动词后面加 "not" Grammar Focus 情态动词 must, can, need等 情态动词精讲 一. can的用法 1.表示能力 Eg: She can swim, but I can’t. 2.表示请求、允许，与may 意思相近。 eg: Can I use your pen? 3. 表示推测，意为“可能”，常用在否定句和疑问句中， 表推测时，can’t 意为“不可能” eg：The news can’t be true. could 是 can 的过去式。 情态动词精讲 二. must 的用法 1.表示命令“必须” : You must come early tomorrow． 2.表示推测“肯定，一定” : They must be at home. The light is on. 3. 其否定形式must not (mustn’t)表示 “不能，不允许，禁止” : Everyone must obey the school rules. You mustn’t break them. 注：以must开头的一般疑问句，肯定回答用must, 否定回答用needn’t或don’t have to(表“不必要，不必须”). --Must I clean the room now? Yes, you must. No, you needn’t./ No, you don’t have to. 1.--Must I come before eight o'clock? --No, you _______.” A. can't B. don't C. mustn't D. needn't 2.--Must I finish all the work before I leave? --Yes, you _______ .” A. must B. can C. mustn't D. needn't 3. You ___ be quiet when you are in a library. A. may B. can C. will D. must D A D 侧重点不同 时态形式不同 否定式的结构和意义不同 must have to must只有一个形态； have to有多种时态。 mustn't 禁止；不允许 have to的否定为don't have to 不必 =needn't. 侧重于主观看法，认为有必要或有意义去做某事； 侧重于客观需要，含有“不得不、被迫”之意。 You don't have to tell him about it. You mustn't tell him about it. 你不一定要把此事告诉他。 你不得把这件事告诉他。 区分 must & have to 三. need 的用法 1.用作情态动词，表示“需要”，用于疑问句和否定句中。 You needn’t finish your homework today. 2.以need开头的一般疑问句，肯定回答用must, 否定回答用needn’t. Need I help you with the housework, Mum? 3. need用作实义动词，常用于肯定句。常用结构 need to do sth，否定结构需借助于助动词don’t/do