Past
Gone by
Synonyms: Gone by, over and done with, gone, dead and buried, ended, bygone, old, earlier, ancient, extinct, olden, over, no more, done, finished, forgotten, former, of old, long-ago, defunct, of yore, and foregone.
Previous
Synonyms: Previous, prior, late, as was, sometime, quondam, former, foregoing, erstwhile, one-time, ex-, and whilom.
Last
Formerly
Synonyms: Formerly, in days/years/times gone by, back in the day, in the (good) old days, in days of old, in olden times, before, once, time was when, long ago, in days of yore, in yesteryear, previously, in bygone days, in former times, at one time, in the olden days, in the before times, hitherto, once upon a time, in auld lang syne, in antiquity, and of yore.
History
Synonyms: History, life story, experience, biography, background, life, and career to date.
Example Sentences
She reflected on her past experiences.
We walked past the old house.
The past year was very challenging.
He learned from past mistakes thoughtfully.