表示不耐烦时用 can't you ? 如:
Shut up, can't you ? 别说了,行不行? (摘自《牛津英语用法指南》第四版 306.2)
为了强调客气的语气,以示更加婉转,也可以用 can/can't you? 如:
Open the door, can't you? 你可以打开门吗?
Save us a seat, can one of you?你们中哪一位可以给我们留个位置吗?
Give me some paper, can you? 可以再给我些纸吗?
(以上摘自赵俊英《现代英语语法》p.1130)