He has died 表动作
He has been dead for 3 years.表状态,死了多长时间.
He is dying 他就要死了那为何has后有时用died 有时 又用been death 我虽然知道一个是完成时 但has died为什么不是完成时呢？has died 也是完成时has been dead 也是完成时， 可以与时间段相连。