Formal:
* 再見 (zài jiàn): This is the most common and polite way to say goodbye, literally meaning "see you again."
* 告別 (gào bié): This is a slightly more formal way to say goodbye, meaning "farewell."
Informal:
* 再會 (zài huì): This is a more casual way to say goodbye, meaning "see you later."
* 拜拜 (bài bai): This is a very casual way to say goodbye, similar to "bye-bye" in English.
* 下次見 (xià cì jiàn): This means "see you next time" and is a casual way to say goodbye.
* 保重 (bǎo zhòng): This literally means "take care" and is a way to say goodbye when you are concerned for the other person's well-being.
Choosing the right phrase:
* Formal occasions: Use 再見 (zài jiàn) or 告別 (gào bié).
* Casual conversations: Use 再會 (zài huì), 拜拜 (bài bai), or 下次見 (xià cì jiàn).
* Showing concern: Use 保重 (bǎo zhòng).
Keep in mind that the specific meaning of each phrase can vary slightly depending on the context and the tone of voice.