when I am finished会错吗?为什么是am ,不是have?

when I am finished会错吗?为什么是am ,不是have? I am going to play football when I ____my home work.Awill finishB.finished C.FINISH When I ------- my work tomorrow,I will go swimming with you.A.will finish B.have finished C.am finishing D.finished I am going to play football when I ____my home work.Awill finishB.finished C.FINISH请说明原因! I am finished 这里为什么要用be finished? when i am gone WHO I AM WHEN I AM WITHOUT I am going to be a teacher when I ----middle school.A will finish B finishes C finished D finish 额、、可不可以说明为什么选这个答案呀 i am finished和i have finished倒底一样不一样 When I am clean,I am black.When I am dirty,I am White. 可是说i am finished吗?为什么是finished?这是什么时态?跟i have finished有什么差别? who i am when i am when you When I Am Gone 歌词 when I am after 23 when I am after 17 When I am after 20 What were you doing when I phoned you yesterday evening?I( )just finished my homework and I( )to watch TV.A.have,am going B.have,was goingC.had,was goingD.had,am going 写明为什么 when I finished school ,I want to be a teacher.前面finished为什么用过去式