Formal:
* 再見 (zài jiàn): This is the most common and neutral way to say goodbye. It literally means "see you again."
* 告別 (gào bié): This is more formal and used in farewell speeches or when leaving someone for a long time. It means "to say farewell."
Informal:
* 拜拜 (bài bài): This is a casual and friendly 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 more informal way to say goodbye.
* 保重 (bǎo zhòng): This means "take care" and is often used when leaving someone for a long time or when they are sick.
Other options:
* 一路順風 (yī lù shùn fēng): This means "have a smooth journey" and is used when someone is leaving for a trip.
* 祝你一切順利 (zhù nǐ yī qiè shùnlì): This means "I wish you all the best" and is a more general farewell.
The best way to choose the right phrase is to consider the situation and the person you are saying goodbye to.