英语中助动词,情态动词,行为动词,实义动词,系动词有什么?还有否定...答:He was able to go to the party yesterday evening in spite of the heavy rain. 2) 表示请求和允许。 ---Can I go now? --- Yes, you can. / No, you can’t. 此时可与may互换。在疑问句中还可用could,might代替,不是过去式,只是语气更委婉,不能用于肯定句和答语中。 --- Could I ...