为什么用are you finished

are you finished with that marketing book i lent you.为什么用wit have you finished already?为什么用already have you finished already?为什么不用have you finished yet? Are you finished?句子是什么结构 有这种说法吗?Are you finished? Are you finished?有这种说法吗? 你们完成了吗是are you finished 还是 have you finished 还是什么? I am finished 这里为什么要用be finished? are you finished packing yet?这里的finished是形容词是么? lf you are finished then press "submit" under mcnu! Yon cannot log-in because you are not finished identificatio when you are finished drinking有语病吗?