Formal:
* E se pupo (e seh poo-poh) - This is the most common and polite way to express gratitude.
* Mo dupe pupọ (moh doo-peh poo-poh) - This is a slightly more formal way of saying thank you very much.
Informal:
* E se gan (e seh gahn) - This is a more casual way of saying thank you very much.
* O se gan (oh seh gahn) - This is another casual way of saying thank you very much.
Emphasis:
* E se gan-an (e seh gahn-ahn) - This adds emphasis to "thank you very much".
* O se gan-an (oh seh gahn-ahn) - This adds emphasis to "thank you very much".
You can also use the phrase "Mo dupẹ́" (moh doo-peh) which literally translates to "I thank you" and is often used as a way of saying thank you.
Remember that the best way to express your gratitude will depend on the context and your relationship with the person you are speaking to.