Formal:
* Mahalo nui loa: This is the most common and formal way to say "thank you very much."
* Mahalo nui: This is also formal and means "thank you very much."
Informal:
* Mahalo: This is a simple and informal way to say "thank you."
* Mahalo ʻia ʻoe: This literally means "thank you" and is slightly more formal than "Mahalo."
More specific expressions:
* Mahalo no kou aloha: Thank you for your love.
* Mahalo no kou manawa: Thank you for your time.
* Mahalo no kou kōkua: Thank you for your help.
You can also add "e" to the beginning of any of these phrases to make it more polite:
* E mahalo nui loa: Thank you very much (more polite)
Choosing the right expression depends on the situation and your relationship with the person you are thanking.