Since there aren't many exercises on perfective and imperfective aspect in Serbian, I'll share all my video lessons and exercises for you to practice. 

Aspect in Serbian - Short Explanation

The easiest way to see the difference and the most frequent forms are to contrast present and past tense in Serbian. 

Aspect in Serbian - Trošiti vs Potrošiti  

  1. The Perfective Aspect of the verbs in Serbian shows most naturally in the past tense, denoting the finished action: Potrošila sam puno novca na kompjuter (I have spent /I spent a lot of money on the computer)
  2. The Imperfective Aspect shows clearly in the present tense, showing duration: Dok ti štediš novac, ja ga trošim (While you are saving money, I am spending it) - HOWEVER, it can be used for regular actions and habits as well: koliko novca trošiš svakog mesec? (how much money do you spend each month) 


Aspect in Serbian - Video Exercise

Therefore, this word order exercise is dedicated only to this clear PRESENT/PAST distinction 



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Aspect in Serbian - Word order Exercise




Why the present tense hides the perfective

Your own explanation with trošiti and potrošiti points at the key fact: a perfective verb has no real present meaning. Potrošim does not mean I am spending — it means something like once I have spent, and it only appears inside a subordinate clause or a future construction: Kad potrošim platu, ne izlazim.

That is why the cleanest way to feel aspect is the contrast you set up: the imperfective lives in the present, the perfective lives in the past. Trošim novac describes the activity as it runs; Potrošila sam novac reports it as finished and looks at the empty wallet. Same money, two ways of seeing the event.

The same action, two aspects

LatinicaЋирилицаEnglish
Svakog meseca trošim previše na knjige.Сваког месеца трошим превише на књиге.Every month I spend too much on books.
Potrošila sam celu platu za dve nedelje.Потрошила сам целу плату за две недеље.I spent the whole salary in two weeks.
Dok ti štediš, ja polako trošim.Док ти штедиш, ја полако трошим.While you save, I slowly spend.
Kad potrošim ovo, više ne kupujem ništa.Кад потрошим ово, више не купујем ништа.When I have spent this, I am not buying anything else.
Čitam ovu knjigu već mesec dana.Читам ову књигу већ месец дана.I have been reading this book for a month.

Present for the habit, past for the result

Take five verbs you use daily and say two sentences with each: one in the present with the imperfective, one in the past with the perfective. Ten sentences, five minutes. This one drill teaches aspect better than any table, because it makes you feel where each form naturally belongs.

Choose the aspect

Translate each sentence and write P or I beside it for perfective or imperfective. Give the Latin and Cyrillic forms.

  1. I am writing a letter.
  2. I wrote the letter yesterday.
  3. She reads every evening.
  4. We finished the work on time.
  5. How much do you spend each month?
Answers for the aspect practice
EnglishLatinicaЋирилица
I am writing a letter.Pišem pismo.Пишем писмо.
I wrote the letter yesterday.Napisala sam pismo juče.Написала сам писмо јуче.
She reads every evening.Ona čita svako veče.Она чита свако вече.
We finished the work on time.Završili smo posao na vreme.Завршили смо посао на време.
How much do you spend each month?Koliko trošiš svakog meseca?Колико трошиш сваког месеца?