Aspect in the Present and Future

Only imperfective verbs have a present tense: я пишу (I write / am writing), вона встає (she gets up). A perfective verb with the same endings means the future: напишу (I will write it, and finish).

The future has two kinds:

• Perfective future for one complete action or a result: Завтра я подзвоню тобі. (I'll call you tomorrow.)
• Imperfective future for a process or a repeated action: писатиму or буду писати (I will be writing). Both forms are correct. A perfective verb never takes буду.

Signals for the imperfective: щодня, весь тиждень, цілий день, ще. Signals for the perfective: за годину, до п'ятниці, як тільки, and a chain of actions.

In a коли or якщо clause about one future event, use the perfective: Коли Андрій повернеться, ми підемо в кіно. (When Andrii comes back, we'll go to the cinema.)