情态动词的用法,can,may,must,need,could,dared答:情态动词有can (could), may (might), must, have to, shall (should, will (would), dare (dared), need (needed), ought to等。 情态动词无人称和数的变化;不能单独使用,必须与其后的动词原形构成谓语 一、 can, could 1) 表示能力(体力、知识、技能)。Can you lift this heavy box?
情态动词的用法,can,may,must,need,could,dared答:2) need 作情态动词用时, 常用于疑问句、否定句。在肯定句中一般用must, have to, ought to, should代替。1.You needn’t come so early.2. --- Need I finish the work today?--- Yes, you must. / No, you needn’t.3) dare和 need作实义动词用时, 有人称、时态和数的变化。...