i have finished my homework,为什麼不i had?

i have finished my homework,为什麼不i had? I have finished my homework I have\hadHave\had you finished homework?finished homework.( I have finished my homework.反义疑问句 A:I have finished my homework ---I have finished my homework already, mum. I have finished my homework now. I (have finished) my homework now.选择题 I have finished my homework.可否这么说 I finished my homework.为什么 "I have finished my homework."和“I finished my homework."有区别吗 I have finished my homework before I leave home. I have finished my homework before I ______(leave).