Htjela bi se useliti prije jeseni, ali stan još nije potpuno spreman.

It is the conditional form of htjeti, meaning would want or, more naturally in English, would like.

So Htjela bi se useliti means She would like to move in.

Because htjela is the feminine singular form.

In Croatian, this part of the conditional agrees with the subject in gender and number:

• htio bi = he would like
• htjela bi = she would like
• htjelo bi = it would like
• htjeli bi / htjele bi = they would like

So this sentence points to a female singular subject.

bi is the conditional auxiliary in the 3rd person singular.

Croatian forms the conditional with:

• a participle-like form such as htjela
• plus the auxiliary bih, bi, bismo, biste, bi

So:

• htjela bih = I would like, said by a woman
• htjela bi = she would like

That means this sentence is clearly 3rd person singular, not 1st person.

Because bi is a clitic, and Croatian clitics usually go in second position in the sentence or clause.

Here the sentence begins with Htjela, so the clitic bi comes right after it:

• Htjela bi...

If you added the subject pronoun, the order would usually change:

• Ona bi se htjela useliti...

So the placement of bi is mostly about Croatian clitic word order.

Because the verb is useliti se, which means to move in.

Many Croatian verbs are used with se. In this case, se is just part of the normal verb form learners need to remember:

• useliti se = to move in

Without se, you do not have the same meaning.

Because se is also a clitic, and clitics move toward the front of the clause.

So although the dictionary form is:

• useliti se

in a sentence you often get:

• htjela bi se useliti

This is completely normal Croatian word order.

They are related, but not the same.

• useliti se = to move in, meaning to enter a new home or apartment
• seliti se = to move house / be moving, more general
• preseliti se = to move / relocate from one place to another

In this sentence, useliti se is used because the focus is on moving into the apartment.

Because prije requires the genitive case.

The noun jesen changes in the genitive singular to jeseni:

• jesen = autumn, nominative
• jeseni = of autumn / before autumn, genitive form after prije

So:

• prije jeseni = before autumn

Here još means still or yet, depending on how you translate it into English.

So:

• stan još nije potpuno spreman

can mean:

• the apartment is still not completely ready
• the apartment isn’t completely ready yet

Croatian often uses još where English chooses either still or yet.

Because nije is the negative form of je in the present tense of biti, meaning is not.

The negative present forms of biti are irregular:

• nisam
• nisi
• nije
• nismo
• niste
• nisu

Since stan is 3rd person singular, nije is the correct form.

Because adjectives in Croatian agree with the noun they describe.

The noun stan is masculine singular, so the adjective must also be masculine singular:

• stan je spreman = the apartment is ready

Compare:

• soba je spremna = the room is ready
• mjesto je spremno = the place is ready

potpuno is an adverb meaning completely or fully.

It modifies the adjective spreman:

• potpuno spreman = completely ready

So nije potpuno spreman means is not completely ready.

Yes. Croatian often leaves out subject pronouns when they are not needed.

Here, the form htjela bi already tells you a lot:

• feminine
• singular
• 3rd person

So Croatian does not need to say ona unless the speaker wants extra emphasis or contrast.

Not completely. Croatian word order is fairly flexible, but clitics like bi and se have stricter placement rules.

So:

• Htjela bi se useliti... = normal
• Htjela se bi useliti... = not correct

Other parts of the sentence can move around more easily for emphasis, but the clitics usually stay near the beginning of the clause.