Biaspectual Verbs (Двувидовые глаголы)
In Russian, most verbs come in imperfective and perfective pairs. However, some verbs are biaspectual: a single verb functions as both aspects.
Because the verb itself doesn't change forms, you must rely on context—such as adverbs of time—to determine if the action is ongoing, habitual, or a completed result.
| to investigate (research, explore) | исследовать |
| The scientist is researching the history of the city. | Учёный исследует историю города. |
| We will investigate this problem tomorrow. | Завтра мы исследуем эту проблему. |
Notice how the verb acts as a present-tense imperfective in the first sentence and a future-tense perfective in the second. The word завтра (tomorrow) is the contextual clue that shifts the meaning.
The "-ировать" Pattern
Most biaspectual verbs in Russian are borrowed from other languages and end in -ировать. They conjugate like standard -овать verbs (the -ова- changes to -у-). Let's look at how adverbs like сейчас (right now), всегда (always), and завтра (tomorrow) clarify the aspect.
| The company is modernizing the production right now. | Компания модернизирует производство сейчас. |
| The company always compensates hotel expenses. | Компания всегда компенсирует расходы на отель. |
| Moreover, tomorrow we will compensate the losses. | Более того, завтра мы компенсируем убытки. |
| Tomorrow the channel will broadcast the most important match. | Завтра канал транслирует самый важный матч. |
Past Tense and Infinitive
This flexibility also applies to the past tense and the infinitive. Depending on the surrounding words, the action is viewed as an ongoing process or a successfully executed plan.
| You need to eliminate the error. | Вам нужно ликвидировать ошибку. |
| They eliminated the problem very quickly. | Они ликвидировали проблему очень быстро. |
| Yesterday we implemented this successful project. | Вчера мы реализовали этот успешный проект. |
Words like скоро (soon) often trigger a perfective future meaning, while words like обычно (usually) indicate a habitual, imperfective meaning.
| Soon the police will evacuate the building. | Скоро полиция эвакуирует здание. |
| Usually they evacuate people quickly. | Обычно они эвакуируют людей быстро. |