为什么 days are gone 不用 days have been gone?

gone are the days动词为什么不用过去式 gone are the days Gone Are The Days 歌词 gone are the days 怎样用 Those Days Are Gone 歌词 Farewell,all the days that have/are long gone~ Those Dancing Days Are Gone 歌词 Those days are past and gone.翻译 Those dancing days are gone中文歌词~ They have been there for three days.与they have gone there fo where have you been these days?I have gone to DaZhu with my Days Gone By 歌词