The Imperative as "If"
In Russian, you do not always need the word если (if) to create a conditional sentence. To add a dynamic, literary, or dramatic flair to your speech, you can use the imperative (command) form of a verb to express a condition.
Future (Real) Conditions
To describe a realistic condition like "If X happens, Y will happen," start the sentence with the imperative verb, followed by the subject. Connect this condition to the result using the conjunction и (and), then state the outcome in the future tense.
Crucially, the verb in the "if" clause is always in the singular imperative form—even if the subject is a third-party object like a rocket or a satellite.
| If the rocket enters this trajectory, we will lose it. | Выйди ракета на эту траекторию, и мы потеряем её. |
| If the satellite deviates from the trajectory, we will fail the project. | Отклонись спутник от траектории, и мы провалим проект. |
Past (Unreal) Conditions
You can also use this structure to talk about alternate pasts ("Had X happened, Y would have happened"). For these hypothetical scenarios, use the imperative verb and subject for the condition.
Instead of joining the two halves with и, simply follow the condition with a standard hypothetical result clause (a past tense verb plus the particle бы).
| Had you calculated the trajectory yesterday, we would have already launched the rocket. | Рассчитай ты траекторию вчера, мы бы уже запустили ракету. |
Notice again how the imperative remains in the singular command form (надень), even when the subject is a third-party noun like a cosmonaut.
| Had the cosmonaut put on the old spacesuit, he would have perished. | Надень космонавт старый скафандр, он бы погиб. |
Negative Conditions
To describe what would have happened if an action had not occurred, just place the negative particle не directly before the imperative verb. This works seamlessly even with plural subjects like мы (we), while the verb still remains a singular command.
| Had we not calculated the speed on time, the satellite would have exploded. | Не рассчитай мы скорость вовремя, спутник бы взорвался. |