Formal:
* Спасибо (Spasibo) - This is the most common and polite way to say "thank you" in any situation.
* Большое спасибо (Bolshoe spasibo) - This translates to "thank you very much" and is a more formal way to express gratitude.
* Огромное спасибо (Oгромное спасибо) - This means "thank you so much" and is even more formal and heartfelt than "Большое спасибо."
Informal:
* Спасибо (Spasibo) - This is also used informally, but with a more casual tone.
* Спасибо тебе (Spasibo tebye) - This means "thank you" directly to someone and is more personal.
* Благодарю (Blagodaryu) - This translates to "I thank you" and is slightly more formal than "спасибо."
* Спасибо большое (Spasibo bolshoe) - This is an informal way to say "thank you very much."
Other expressions:
* Заранее благодарю (Zaraнее blagodaryu) - This means "thank you in advance."
* Спасибо за помощь (Spasibo za pomoshch) - This means "thank you for your help."
Choosing the right expression:
* Formal situations: Use "Спасибо," "Большое спасибо," or "Огромное спасибо."
* Informal situations: Use "Спасибо," "Спасибо тебе," or "Спасибо большое."
Remember that context is key. If you're unsure which expression is appropriate, it's always best to err on the side of formality.