Formal:
* Diolch yn fawr (dee-olch un vour) - This is the most common and formal way to say "thank you very much".
* Diolch yn fawr iawn (dee-olch un vour ee-awn) - This is even more formal and means "thank you very much indeed".
Informal:
* Diolch (dee-olch) - This is the most basic and informal way to say "thank you".
* Diolch yn fawr i chi (dee-olch un vour ee kee) - This is a more polite and informal way to say "thank you very much" to a specific person.
* Diolch am hynny (dee-olch am hin-nee) - This means "thank you for that" and is a good way to express gratitude for something specific.
Other options:
* Diolch yn fawr iawn am eich cymorth (dee-olch un vour ee-awn am eech kum-orth) - This means "thank you very much for your help".
* Diolch yn fawr i chi am eich amser (dee-olch un vour ee-awn am eech am-ser) - This means "thank you very much for your time".
You can also use "diolch" followed by a specific phrase to express gratitude for something, for example:
* Diolch am y bwyd (dee-olch am ee boo-eeth) - Thank you for the food.
* Diolch am y rhoddion (dee-olch am ee rhod-dee-on) - Thank you for the gifts.
Remember to pronounce the "ch" sound like the "ch" in the English word "loch".