九年级英语下册 module 5 rules and suggestions unit 3 language in use教案2 外研版.doc

U3Language in use 导入基本思路: 课题: U3Language in use 第二课时语法课堂: 情态动词 1. 定义: 情态动词是一种本身有一定的词义, 表示说话人的情绪, 态度或语气的动词, 但不能单独作谓语, 只能和其他动词原形构成谓语。 We can be there on time tomorrow. 我们明天能按时去那儿。 May I have your name? 我能知道你的名字吗? Shall we begin now? 我们现在就开始吗? You must obey the school rules. 你必须遵守校规。 2. 情态动词数量不多, 但用途广泛, 主要有下列: can (could), may (might), must, need, ought to, dare (dared), shall (should), will (would) . 3. 情态动词的位置: 情态动词在句中放在谓语动词之前, 谓语动词前若有助动词, 则在助动词之前, 疑问句中, 情态动词则在主语之前。 I can see you. Come here. He must have been away. 他一定走了。 What can I do for you? How dare you treat us like that !你怎能那样对待我们! 4. 情态动词的特点: 情态动词无人称和数的变化, 情态动词后面跟的动词需用原形, 否定式构成 He told me he might be here on time. Might I borrow some money now. He might be alive. 他可能还活着。 3) Must 必须, 应该, 一定, 准是, 表示说话人认为有必要做某事, 命令, 要求别人做某事以及对事物的推测。 must 用来指一般现在时和一般将来时, 过去式可用 have to 的过去式代替。 I must finish my work today. You mustn't work all the time. Must I return the book tomorrow? 我必须明天还书吗? After such a long walk, you must be tired 走了这么长的路, 你一定困了。 He must be the man I am looking for. 他一定是我要找的人。 He had to go because of somebody's calling him that day. 那天他要走是因为有人叫他。注: must + have + 过去分词, 表示现在对过去事物的推测。 He must have told my parents about it. 他一定把这件事情告诉我父母亲了。 He must have received my letter now. 他现在一定收到我的信了。 It's six o'clock already, we must have been late again. 已经六点钟了,我们一定又迟到了。 must 和 have to 的区别: must 表示说话人的主观思想, have to 表示客观需要。 You must do