Questions & Answers about Želiš li komadić sira?
How is the word komadić formed, and what is its gender?
The word komadić (a small piece) is a diminutive formed by taking the masculine noun komad (piece) and adding the suffix -ić. Nouns that take the -ić suffix are always masculine.
If komadić is the direct object of the verb želiš, why doesn't its ending change?
Direct objects take the accusative case. For masculine nouns, the accusative ending depends on whether the noun is alive. Since komadić is inanimate (a non-living thing), its accusative form stays exactly the same as its nominative form. If it were a living diminutive like psić (little dog), the accusative would change to psića.
Why is the word for cheese written as sira instead of just sir?
sira is the genitive case of the masculine noun sir. You need the genitive here to express the English equivalent of "of", linking the quantity or portion (komadić) to the substance itself (a piece of cheese).
Could I ask this question using da li instead?
Yes, you could say Da li želiš komadić sira? Both forms are correct and very common. However, starting with the verb followed by the question particle li (as seen in this sentence) is the more standard, formally preferred way to ask a yes/no question in written Croatian.