Yesterday's the past,have become past,today is a new

Yesterday's the past,have become past,today is a new
Yesterday's the past,have become past,today is a new

Yesterday's the past,have become past,today is a new
昨天已是过去.（忘记过去）迎接新的明天.
Yesterday's the past是昨天已是过去之意.have become past也可以表示昨天已是过去之意,但是用在此.更有语气加重之意.
P.S：这几天喜欢陈绮贞的一句歌词：用今天换回昨天.用明天换回失去的.

Yesterday is the past, and have become past.Today is a new start.
昨天已成为过去。今天将是一个新的开始。

昨天已是过去，今天是新的开始。

昨天是过去时，已经过去了，今天是新的开始