Ona mi vraća kusur posle večere.

she

Breakdown of Ona mi vraća kusur posle večere.

• mi: me
• večera: dinner
• posle: after

Questions & Answers about Ona mi vraća kusur posle večere.

Why is ona included? Could you just say Mi vraća kusur posle večere?

Yes, you often can omit ona in Serbian if the subject is already clear from context, because the verb form vraća already suggests he/she/it returns.

So both are possible:

• Ona mi vraća kusur posle večere.
• Mi vraća kusur posle večere.

Including ona usually adds one of these effects:

• emphasis: She is the one returning the change
• contrast: not someone else, but she
• clarity: if it is important to identify the subject

Serbian often drops subject pronouns more than English does.

What does mi mean here, and what case is it?

Mi here means to me and it is the dative singular form of ja.

So:

• ja = I
• meni / mi = to me

In this sentence, mi is an unstressed clitic form, which is very common in everyday Serbian.

Compare:

• Ona mi vraća kusur. = She is giving me back the change.
• Ona vraća kusur meni. = She returns the change to me.
  This sounds more emphatic or contrastive.

Why is it ? What form of the verb is that?