Formal:
* Дякую (Dyakuyu) - This is the most common and formal way to say "thank you."
* Щиро дякую (Shchyro dyakuyu) - This means "Thank you sincerely" and is a more polite and formal expression.
Informal:
* Дякую (Dyakuyu) - You can also use this in informal settings, but it's less common.
* Спасибі (Spasybi) - This is a more casual and informal way to say "thank you."
* Дякую тобі (Dyakuyu tobi) - This means "Thank you to you" and is used when speaking directly to someone.
Other expressions:
* Велика дяка (Velyka dyaka) - This means "Big thanks" and is a more emphatic way to express gratitude.
* Щира подяка (Shchyra podyaka) - This means "Sincere thanks" and is a formal way to express gratitude.
Which one to use?
* Dyakuyu is the safest option in most situations.
* Spasybi is more informal and can be used with friends and family.
* Dyakuyu tobi is a more personal way to say "thank you" and is usually used with people you know well.
* Shchyro dyakuyu and Velyka dyaka are more formal and can be used in professional settings or when expressing deep gratitude.
Remember to always be respectful when using any of these phrases.