Formal:
* 可能 (hoeng2 nei5) - This is the most common and formal way to say "maybe."
* 也許 (jaa5 heoi2) - This is another formal option, similar in meaning to "perhaps."
Informal:
* 唔知 (m4 zi1) - This literally means "don't know," but it's often used as a casual way of saying "maybe."
* 可能 (hoeng2 nei5) - While this is formal, it's commonly used in everyday conversations.
* 唔肯定 (m4 hang2 ding2) - This translates to "not certain," but can be used to convey "maybe."
Examples:
* 我可能去 (ngo5 hoeng2 nei5 heoi3) - I might go.
* 也許會下雨 (jaa5 heoi2 wui5 haa2 jyu2) - Perhaps it will rain.
* 唔知呢 (m4 zi1 ni1) - Maybe?
* 唔肯定 (m4 hang2 ding2) - Maybe, I'm not sure.
The best way to choose the right word is to consider the situation and your relationship with the person you are talking to. For instance, you would use a more formal phrase when talking to an elder or a stranger, but a more informal phrase when talking to a friend.