Formal:
* Mèsi anpil (pronounced: mer-see ahn-peel) - This is the most common and polite way to say "thank you very much".
Informal:
* Mèsi (pronounced: mer-see) - This is a more casual way to say "thank you".
* Gras (pronounced: grahs) - This is another informal way to say "thank you", literally meaning "thanks".
* Mèsi beaucoup (pronounced: mer-see bo-koo) - This is another common way to say "thank you very much", more informal than "Mèsi anpil".
With Gratitude:
* Mèsi anpil pou sa (pronounced: mer-see ahn-peel poo sa) - This means "thank you very much for that".
* Mèsi pou tout sa w fè pou mwen (pronounced: mer-see poo too sa w feh poo mwen) - This means "thank you for everything you do for me".
You can also add "byen" (pronounced: bee-en) after any of these phrases for emphasis, like "Mèsi bien" or "Mèsi anpil bien".