Formal:
* Przepraszam. (This is the most common and general apology.)
* Bardzo przepraszam. (This means "I am very sorry" and shows more remorse.)
* Przepraszam za… (This means "I apologize for…" and allows you to specify what you are apologizing for.)
Informal:
* Przepraszam. (Same as the formal version, but more casual.)
* Wybacz. (This means "Excuse me" or "Forgive me" and is more casual than "przepraszam.")
* Przepraszam, że… (This means "Sorry that…" and allows you to specify what you are apologizing for.)
Other options:
* Przykro mi. (This means "I'm sorry" and is used in situations where you are expressing empathy or sympathy.)
* Przepraszam, ale… (This means "Sorry, but…" and is used to politely disagree or explain something.)
Remember to choose the appropriate phrase based on the context and your relationship with the person you are apologizing to.