If It Weren't For: если бы не
When you want to express how a specific factor prevented a disaster—like timely support saving a failing project—use the phrase если бы не (if it weren't for).
| if it weren't for | если бы не |
Here is the best part of this grammar structure: the person or thing immediately following this phrase stays in the Nominative case (its basic dictionary form). You do not need to change the noun's ending at all.
| If it weren't for your contribution, the project would have collapsed. | Если бы не твой вклад, проект бы рухнул. |
| If it weren't for their professionalism, we would have failed the task. | Если бы не их профессионализм, мы бы провалили задание. |
The Hypothetical Result
Because you are describing an alternate reality—something that would have happened—the main clause acts like a standard conditional. You must include the hypothetical particle бы alongside a past tense verb.
| If it weren't for the promptness of the colleagues, we would not have made it in time. | Если бы не оперативность коллег, мы бы не успели. |
| If it weren't for your intervention, we would have lost the client. | Если бы не ваше вмешательство, мы бы потеряли клиента. |
Clause Order
Just like in English, you can place the если бы не condition at the beginning or at the end of the sentence. Regardless of the order, always separate the two halves of the sentence with a comma.
| The company would have collapsed if it weren't for the cohesion of the team. | Компания бы рухнула, если бы не сплочённость команды. |