I am finished 这里为什么要用be finished?

I am finished 这里为什么要用be finished? 英语 i am not finished with my dinner yet 这里为什么要用f I am finished. I am finished when I am finished会错吗? I will go as soon as I have finished my lesson.这里的从句为什么要用现在完 i was finished i am finished 和 i was finish 可是说i am finished吗? i am already finished watering them he did not go home until he finished the work.为什么这里要用until?不 have finished 为什么要用现在完成时? 我做完了,I'm finished.,这里的finished是形容词.当finish作动词时,应写成I finished