HSK 2
Shíguò-jìngqiān, hěnduō shìqing yǐjīng bùyīyàng le.
With time passing and circumstances shifting, many things are no longer the same.
HSK 7-9
Shíguò-jìngqiān, dāngnián de péngyou dōu gèbēn-dōngxī le.
Times have changed - old friends have gone their separate ways.