高中语法 情态动词的用法（41张PPT）

情态动词表示说话人的某种 感情或语气，对某一动作 或状态的某种态度。 表示“需要、可以、 必须、应当”等。 什么是情态动词？(modal verbs) Note 2 Note 1 functions of Modal verbs ability certainty permission obligation make requests make suggestions make offers give advice 能力 职责 确定 许可 提出要求 给出建议 提供帮助 提出忠告 Words like can, will, may, must, and a few others are called modals. Modal verbs help other verbs express a meaning or an idea. Some common uses of the modals are these: Ability: He can speak English now. He couldn’t speak English a year ago. I’m not able to come to the game on Friday. Obligation: You must fasten your seat belts. (strong) You should pay attention. (weak) You ought to pay attention. Certainty: It may rain. How could I forget an important thing like that? He can’t / couldn’t have known