This is the 16041st most frequent Polish word.
twoja
"Twoja" means "your" in English.
In this sentence, "twoja" is used as a possessive adjective referring to feminine noun "książka".
Twoja książka leży na stole.
Your book is lying on the table.
Here, "twoja" is employed to indicate possession, referencing the feminine noun "siostra".
Czy to twoja siostra?
Is that your sister?
In this context, "twoja" acts as a possessive pronoun modifying the feminine noun "obecność" to show possession.