Questions & Answers about Vi ska sjunga och spela på Eriks gitarr.
Why does Eriks not have an apostrophe?
In Swedish, the possessive -s is attached directly to the name or noun without an apostrophe. So, "Erik's" simply becomes Eriks.
Why is it gitarr instead of the definite form gitarren?
Just like in English, when you use a possessive word like Eriks (Erik's) or min (my), the noun that follows must be in the indefinite form. You say Eriks gitarr (Erik's guitar), not Eriks gitarren (Erik's the guitar).
Why is the word på (on) in this sentence? English just says "play Erik's guitar".
In Swedish, when you talk about playing a specific physical musical instrument, you often say you play on it (spela på). This is why "play Erik's guitar" is translated as spela på Eriks gitarr.
Why are sjunga and spela in their dictionary (infinitive) forms?
They follow the helping verb ska (will / are going to). After ska, the main verbs in the sentence always drop the present tense -r ending and stay in the infinitive form.