再见

goodbye; bye; see you later; farewell; ciao; cheers; adieu; cheerio; ta-ta; see you; see you again; later; sayonara; au revoir; so long; TTFN (short for ta-ta for now); BFN (short for bye for now)

过去

pass; go; lapse; elapse; go by; pass by; past; yesterday; yesteryear; back; before; once; old; period; gone; bygone; erstwhile; old-time; of yesteryear; once upon a time