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... пожалуйста помогите дописать нужно предложения

if you know Russian, you will be able to get Russian culture. knowing Russian will give you an opportunity to read original Russian books. the language will be useful when you'd come to Russia. without knowing russian it will be difficult to communicate with Russian people.