高考英语语法一轮复习——情态动词（共23张PPT）

Modal Verb can could may might shall should must will would ought to have to dare (daren’t) need (needn’t) 表示推测 不表示推测 modal verbs 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) Ability: 1 He can speak English now. 能力 2 He couldn’t speak English a year ago. Permission: All passengers may now board. 允许 We can board now. Obligation: You must fasten your seat belts. 义务 (strong) You should pay attention. (weak) You ought to pay attention. Possibility: 1 It may rain. 可能性 2 How could I forget an important thing like that? 3 He can’t /couldn’t have known the result. 情态动词的语法特征 情态动词 不能单独做谓语.不能直接跟宾语，必须搭配实义动词或be动词的原形. 否定式直接后面加not。 2. 情态动词没有人称，数的变化，但有 些情态动词，如can, will也有一般式 和过去式的变化(could/ would)。 1. can的主要用法是：   A.  表示体力或脑力的能力：   e