Learn Hardcore Serbian: Ona sada pije mleko i sok. - She is drinking milk and juice now.

Breakdown of Ona sada pije mleko i sok.

Why is ona included? Can Serbian drop the subject pronoun here?

Yes. Serbian often drops subject pronouns when the verb already makes the subject clear.

So:

Both can mean the same thing.

Including ona adds emphasis or clarity, for example if you want to stress that she is the one drinking, not someone else.

Why is the verb pije and not something like pijem or piju?

Because pije is the 3rd person singular present tense form of piti (to drink).

Here is the present tense of piti:

Since the subject is ona (she), the correct form is pije.

Does pije mean drinks or is drinking?

It can mean both, depending on context.

Serbian present tense often covers both: