Past Tense in Serbian

Let's make a short comparison of the Present Simple and Past Simple in Serbian with this "drinks video" :)

• Šta obično piješ / pijete tokom dana ?
• Šta obično piješ / pijete kada izađeš uveče ?
• Šta si juče pio  / pila ? / Šta ste juče pili ?*

*translation:

• What do you usually drink during the day ? ("piješ" informal, "pijete" formal)
• What do you usually drink when you go out at night ?
• What did you drink yesterday ? ("pio" for masculine singular, "pila" for feminine singular, "pili" for the second person singular, used formally, or for the second person plural, when you are talking to more people)