Questions & Answers about Mój telefon jest zawsze włączony.
Because telefon is grammatically masculine in Polish. Possessive pronouns (like mój / moja / moje) must agree with the gender and number of the noun they modify.
- mój – masculine singular (e.g. mój telefon, mój komputer)
- moja – feminine singular (e.g. moja książka, moja siostra)
- moje – neuter singular (e.g. moje dziecko) or not-masculine-personal plural (e.g. moje okulary)
So with telefon (masculine), you have to use mój.
They are both in the nominative singular.
- mój telefon is the subject of the sentence.
- In a simple “X is Y” sentence, the subject is in the nominative case.
- The adjective/participle włączony is also in the nominative, agreeing with telefon.
So you have:
- mój – nominative masculine singular
- telefon – nominative masculine singular
- włączony – nominative masculine singular