Ongoing vs. Completed Actions
When recounting the past, verbal aspect becomes crucial. The imperfective aspect is used for ongoing, incomplete, or background actions (often "was doing" in English). The perfective aspect is used for single, completed actions ("did").
To describe simultaneous, ongoing actions, use the conjunction dok (while) alongside imperfective verbs. Adverbs like stalno (constantly) also emphasize an ongoing background action.
To describe a sequence of completed events, use perfective verbs. The conjunction čim (as soon as) frequently shows that one completed action immediately triggered another.
Habits and Routines in the Past
When reminiscing about your childhood (djetinjstvo), repeated or habitual actions always use the imperfective aspect. Adverbs like obično (usually), često (often), or dugo (for a long time) are strong indicators that you need an imperfective verb.
The word tada (then, at that time) is often used to set the temporal context for past habits.
Contrasting Aspects in Context
Notice the stark difference in meaning when using imperfective versus perfective verbs in similar situations. Use the imperfective aspect for a background action in progress (such as "were drinking", pili).
When focusing on the successful completion of an action, use the perfective aspect. Adding a prefix often makes a verb perfective (such as "drank up", popili).
Sharing Memories
When sharing a specific memory (uspomena), you will often switch between aspects: imperfective for the general routine or setting, and perfective for specific milestones or tasks.
Compare a habitual past action (imperfective) with a quickly completed, one-time task (perfective):
