Questions & Answers about To jest moja bliźniaczka i ona jest taka sama jak ja.
Why is it taka sama instead of taki sam or tak samo?
The phrase taki sam (the same) acts like an adjective, so it must match the gender, number, and case of the noun it describes. Here, it refers to ona (she / the twin sister), which is feminine and in the nominative case, so we use the feminine form taka sama. If you were talking about a male twin, it would be taki sam.
The English translation says "the same as me". Why does the Polish sentence use ja (I) instead of an object pronoun like mnie (me)?
When you compare two things using jak (as/like), both items must be in the same grammatical case. Because the first person in the comparison, ona (she), is the subject and therefore in the nominative case, the pronoun after jak must also be in the nominative case, which is ja.
I thought identities and family relationships usually take the instrumental case. Why is it moja bliźniaczka (nominative) here?
It is because of the phrase to jest (this is). When you introduce someone or point something out using to, the noun that follows stays in the nominative case. You would only use the instrumental if the subject was a regular pronoun, like in the sentence: Ona jest moją bliźniaczką (She is my twin).
Does bliźniaczka only refer to a female twin?