【正文】
Might/ May I smoke in this room? No, you mustn’t. May/Might I take this book out of the room? Yes, you can. (No, you can’t / mustn’t. ) 用May I...?征徇對方許可時比較正式和客氣,而用Can I...?在口語中更常見。 They’ve changed the timetable, so we can go by bus instead. This hall can hold 500 people at least. 4) 表示推測(驚訝、懷疑、不相信的態(tài)度),用于疑問句、否定句和感嘆句中。如: He was able to go to the party yesterday evening in spite of the heavy rain. 2) 表示請求和允許。 情態(tài)動詞無人稱和數(shù)的變化;不能單獨(dú)使用,必須與其后的動詞原形構(gòu)成謂語 一、 can, could 1) 表示能力(體力、知識、技能)。 Can you lift this heavy box?(體力) Mary can speak three languages.(知識) Can you skate?(技能) 此時可用be able to代替。 Can I go now? Yes, you can. / No, you can’t. 此時可與may互換。 Can this be true? This can’t be done by him.