Learn Hardcore Croatian: Na stolici su novine. - The newspapers are on the chair.

Because after the preposition na meaning on (static location), Croatian uses the locative case. The noun stolica (chair) in the locative singular becomes stolici. So na stolici = on the chair. If it were motion onto the chair, you would use accusative: na stolicu = onto the chair.

Which case is stolici, and what are the key singular forms of stolica?

Stolici is locative singular. Key singular forms:

Nominative: stolica (the chair)
Genitive: stolice (of the chair)
Dative: stolici (to/for the chair)
Accusative: stolicu (the chair, as object)
Locative: stolici (in/on/at the chair)
Instrumental: stolicom (with/by the chair)

Why is it su and not je?

The verb must agree with the subject in number. Novine is grammatically plural, so you use the 3rd person plural of biti (to be): su. With a singular subject, you’d use je:

Na stolici je knjiga. (There is a book on the chair.)
Na stolici su novine. (There are newspapers on the chair.)

Why is novine plural if it means “newspaper”?

Novine is a plural-only noun (pluralia tantum) in Croatian, meaning newspaper(s). To talk about a single copy, you still use the plural noun: jedne novine (one newspaper). For counting, use collective numerals: dvoje novina, troje novina, etc. The singular novina means a novelty/change, not a newspaper.

Can I change the word order to Novine su na stolici?

Yes. Both Na stolici su novine and Novine su na stolici are correct. Fronting Na stolici emphasizes the location (“As for the chair, the newspapers are there”), while Novine su na stolici is a neutral way to state where the newspapers are.

Why does su come after the first phrase? Why not start with Su?

Su is a clitic (an unstressed short word) and must appear in “second position,” i.e., after the first stressed word or phrase. That’s why Na stolici su novine and Novine su na stolici are fine, but starting a sentence with Su (e.g., Su novine na stolici) is ungrammatical.

Where are the articles like “the”? Why isn’t it “the newspapers”?

Croatian has no articles. Definiteness is handled by context, word order, or by using demonstratives. If you want to be explicit, you can say:

One novine su na stolici. (Those newspapers are on the chair.)
Te novine su na stolici. (Those/the particular newspapers are on the chair.)

Why na and not u?

Na means on (in contact with the top surface). U means in/inside. Newspapers are on top of a chair, so na stolici. U stolici would mean inside the chair, which is unusual unless you mean a storage compartment.

How would I express motion, like “onto the chair” versus “on the chair”?

Static location (where?): na
- locative → na stolici (on the chair).
Motion (where to?): na
- accusative → na stolicu (onto the chair). Example: Stavlja novine na stolicu. (He/She is putting the newspapers onto the chair.)

Could I say Na stolici ima novina? What’s the difference from Na stolici su novine?

Yes. Na stolici ima novina uses ima (there is/are) with a partitive/genitive plural (novina) and suggests an unspecified quantity: there are some newspapers on the chair. Na stolici su novine identifies the newspapers as a known/set group.

Can I use other verbs like nalaziti se or ležati?

Yes:

Novine se nalaze na stolici. (The newspapers are located on the chair.) Neutral/formal.
Novine leže na stolici. (The newspapers are lying on the chair.) Describes how they rest. Avoid stoje with novine; flat objects don’t “stand.”

How do I ask questions based on this sentence?

What is on the chair? → Što je na stolici? (Even if the answer is plural, the question uses je with što.)
Where are the newspapers? → Gdje su novine? Answers: Na stolici. or Na stolici su novine.

How do I pronounce the tricky parts?

c in stolica/stolici is pronounced like English ts (sto-LEE-tsi).
v in novine is a light v/w-like sound [ʋ].
Roll the r in Croatian generally (not present here).
Each vowel is clear and short; stress typically falls early in the word.

What’s the difference between stolica and stol?

Stolica = chair; stol = table. So:

Na stolici su novine. (on the chair)
Na stolu su novine. (on the table; locative of stol is stolu)

Do adjectives agree with novine and change the verb?

Yes. Adjectives agree in gender, number, and case; the verb agrees in number:

Na stolici su stare novine. (old newspapers; fem. plural adjective + plural verb)
Na stolici je stara knjiga. (old book; fem. singular adjective + singular verb)

Can I drop the verb biti (to be) the way some languages do?

Not in standard Croatian. You need je/su in normal sentences. Omitting it is telegraphic (headlines, notes) and not standard in full sentences: Novine na stolici sounds like a headline rather than a complete sentence.