SIM kartica je u telefonu.

to be

Breakdown of SIM kartica je u telefonu.

• u: in
• telefon: phone
• SIM kartica: a SIM card

Questions & Answers about SIM kartica je u telefonu.

Why is it u telefonu and not u telefon?

Because u takes different cases depending on the meaning:

• u + locative = in / inside / at a location
• u + accusative = into a place, showing movement toward the inside

Here the SIM card is already located in the phone, so Serbian uses the locative:

• telefon → base dictionary form
• u telefonu → in the phone

So SIM kartica je u telefonu means the SIM card is in the phone, not moving into it.

A movement example would be:

• Stavljam SIM karticu u telefon. = I am putting the SIM card into the phone.

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What case is telefonu?

Telefonu is in the locative singular.

The noun telefon is masculine, and after u with a location meaning, it changes to the locative:

• telefon = phone
• u telefonu = in the phone

For many masculine nouns, the locative singular ends in -u.

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Why is SIM kartica unchanged?

Because SIM kartica is the subject of the sentence, so it stays in the nominative case.