If you know Russian, you will be able to ...
Knowing Russian will give you an opportunity to ...
The language will be useful when ...
Without knowing Russian it will be difficult to ...

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If you know Russian, you will be able to write poems in Russian.Knowing Russian will give you an opportunity to understand russian people.The language will be useful when you will visit russian cities.Without knowing Russian it will be difficult to speak with russian people.Все что смогла придумать)