Question

I am finished 这里为什么要用be finished?

Answer 1

finished在这里是形容词“完蛋了”的意思。

相同的用法：A man is not finished when he is defeated, he is finished when he quits.

一个人如果失败了并不会完蛋，只有放弃了才会完蛋。——尼克松。