Grammatically, ona is the subject, je is the present-tense form of biti (to be), and zaljubljena is an adjective describing her state.
Because it agrees with ona, which is feminine singular.
In Croatian, adjectives change form to match the noun or pronoun they describe.
Here are the basic forms:
So the -a ending shows feminine singular.
Yes, very often.
Croatian frequently drops subject pronouns when the meaning is already clear from context. So you can say:
This is very natural. Croatian uses explicit pronouns like ona mostly for:
For example:
Yes. Croatian word order is more flexible than English.
All of these can occur, depending on emphasis:
However, je is a clitic, so it tends to stay in second position in the sentence or clause. That is why Ona je zaljubljena and Zaljubljena je sound natural, while some other rearrangements sound less normal.
You usually add u + accusative.
Example:
This is an important pattern:
So Croatian does not usually use a direct equivalent of English with here.
They are related, but not the same.
For example:
A person can voljeti someone without the same sense of being zaljubljen/a, and zaljubljen/a often suggests the state of having fallen for someone romantically.
A rough pronunciation guide is:
za-lyu-blye-na
A few helpful points:
Break it up like this:
The tricky parts are the two lj-type combinations: lju and blje.
Yes, that would be wrong in standard Croatian.
Because ona is feminine, the adjective must also be feminine:
Compare:
This is a very important Croatian rule: adjectives must agree with the subject in gender and number.
The adjective and the verb form both change.
Examples:
So in the plural, je becomes su, and zaljubljena changes to match the group.
Yes, very natural.
Ona je zaljubljena is a normal, idiomatic way to say She is in love. In conversation, though, Croatian speakers might often omit the pronoun and simply say:
That often sounds even more natural unless you specifically need to emphasize she.