The card will display the imperfective (Niedokonany) version, think of the answer, then hover your mouse on (click on mobile) the card to display the perfective (Dokonany) version and see if you are correct.
The card will display the imperfective (Niedokonany) version, think of the answer, then hover your mouse on (click on mobile) the card to display the perfective (Dokonany) version and see if you are correct.