Formal:
* 幫幫我 (bāng bāng ngō) - This is the most common and polite way to say "help me" in Cantonese. It literally translates to "help help me".
* 請幫幫我 (cing bāng bāng ngō) - Adding "請 (cing)" makes it even more polite and formal.
Informal:
* 幫吓我 (bāng hā ngō) - This is a more casual way to say "help me."
* 幫手 (bāng sau) - This literally means "help hand" and is used in requests for assistance.
Adding "Please":
* You can add "please" (唔該 (m̀ gāi) or 唔該晒 (m̀ gāi saai)) after any of the above phrases to make your request more polite:
* 幫幫我，唔該 (bāng bāng ngō, m̀ gāi)
* 請幫幫我，唔該 (cing bāng bāng ngō, m̀ gāi)
* 幫吓我，唔該 (bāng hā ngō, m̀ gāi)
* 幫手，唔該 (bāng sau, m̀ gāi)
Example:
* If you need someone to open a door, you could say: "幫幫我開門，唔該 (bāng bāng ngō hoi mun, m̀ gāi)."
Remember that the most appropriate way to say "help me please" depends on the situation and your relationship with the person you are asking for help.