моей

моей

"Моей" means "my" in the feminine singular genitive, dative, instrumental, or prepositional case.

Here, 'моей' is used as a possessive adjective in the dative case, describing 'сестре' (to my sister).

Эта книга принадлежит моей сестре.

This book belongs to my sister.

In this sentence, 'моей' functions as a possessive pronoun in the genitive case, describing 'машине' (to my car).

Я подхожу к моей машине.

I am approaching my car.

Here, 'моей' is a possessive adjective in the prepositional case, describing 'веранде' (on my porch).

Мы сидим на моей веранде.

We are sitting on my porch.