Formal:
* ممنون (Mamnoon): This is the most common and polite way to say thank you.
* تشکر (Tashakkor): This is another formal way to express gratitude.
Informal:
* مرسی (Merci): This is a more casual way to say thank you, often used with friends or family.
* سپاس (Sepas): This is a more poetic and heartfelt way to express gratitude.
You can also add "very much" by saying:
* خیلی ممنون (Kheyli Mamnoon): Thank you very much.
* خیلی تشکر (Kheyli Tashakkor): Thank you very much.
* خیلی مرسی (Kheyli Merci): Thank you very much.
Here are some examples:
* ممنون از شما (Mamnoon az shoma): Thank you. (formal)
* تشکر از شما (Tashakkor az shoma): Thank you. (formal)
* مرسی از شما (Merci az shoma): Thank you. (informal)
* سپاس از شما (Sepas az shoma): Thank you. (poetic)
The best way to choose the right phrase depends on the situation and your relationship with the person you are speaking to.