My mother has killed me,My father is eating me,My brothers and sisters sit under the table,Picking up my bones,And they bury them under the cold marble stones……这是前半部分,都是现在时,可是后半部分的时态突然变成了过去时,I took an axe,and gave my mother forty whacks.When I saw what I had done.I gave my father forty-one.这是为什么呢?