"Це була моя сестра."

Translation: It was my sister.

[Skladanowski]

Sorry.

[J1DM1u]

Does this sentence suggest the question, "What happened to her?"...like she no longer exists? Or is this a perfectly normal answer to who knocked at the door or called on the phone?

[allmillene]

This was ... чому не підходить? Дякую.

[Sco11Pup]

'Was/була' .... The rules for this are???