曾存在过 Once existed suggests acknowledging that one used to be a part of

Relation Nicknames

存在过 [cún zài guò]
Existed once means I did live in this world at one time conveying nostalgia about fleeting moments ...
曾属于过 [céng shŭ yú guò]
Once Belonged : Refers to a past affiliation or connection that has since ended perhaps suggesting ...
曾经的曾经不是曾经 [céng jīng de céng jīng bù shì céng jīng]
Once upon once was not a once expresses the idea that something that happened in the past may seem distant ...
那也曾是我的模样 [nèi yĕ céng shì wŏ de mó yàng]
That Was Once Me signifies reminiscing about ones former self It suggests change over time and a longing ...
你是曾经 [nĭ shì céng jīng]
Simply put it translates to You were once leaving room for interpretation it may imply nostalgia ...