Da li si slobodna danas?

Da li is a very common way to form a yes/no question in Serbian. It does not have a neat word-for-word English equivalent; it functions more like a question marker. In a sentence like this, it signals that the speaker is asking for confirmation rather than giving a statement.

A very common alternative is Jesi li slobodna danas?

Si is the 2nd person singular present tense form of biti (to be), in its short/clitic form.

So here it corresponds to are in Are you free today?

Compare:

• ja sam = I am
• ti si = you are
• on/ona je = he/she is

Serbian often drops subject pronouns when they are already clear from the verb form. Since si already tells you the sentence is about you singular, the pronoun ti is not necessary.

You could say Da li si ti slobodna danas?, but that adds emphasis, something like Are you free today?

Because it agrees with a feminine singular person. The speaker is addressing a woman or girl, so the adjective must match her gender.

Here slobodna is the feminine form of slobodan.

This kind of agreement is very important in Serbian:

• slobodan = masculine singular
• slobodna = feminine singular
• slobodno = neuter singular
• slobodni / slobodne = plural, depending on the group

You would say:

Da li si slobodan danas?

The only change is slobodna → slobodan, because the adjective now agrees with a masculine person.

Then you need the plural form of to be and a plural adjective:

• Da li ste slobodni danas? for a mixed group or a group of men
• Da li ste slobodne danas? for a group of women

So:

• si = singular you are
• ste = plural you are

Yes. Two common alternatives are:

• Jesi li slobodna danas? — very standard
• Slobodna si danas? — more conversational, relying on intonation

So da li is not the only way to make a question, but it is one of the most neutral and common patterns.

The word order is somewhat flexible. You can also say:

• Da li si danas slobodna?
• Jesi li danas slobodna?

All of these are natural. Moving danas changes the rhythm or focus slightly, but not the core meaning.

What is less flexible is the position of si. Short forms like si usually stay near the beginning of the clause, so something like Da li slobodna si danas? would sound wrong.

It can mean different things depending on context:

• free / available = not busy, not occupied
• free in a broader sense
• sometimes single, depending on context

In this sentence, because of danas (today), the natural meaning is available/free today, not single.

Yes. Si shows that the speaker is talking to one person informally.

That means it is appropriate for:

• a friend
• a family member
• someone your age you speak casually with

If you wanted plural or formal you, you would use ste instead.

In Cyrillic, it is:

Да ли си слободна данас?

Serbian is commonly written in both Latin and Cyrillic, and both are standard.