Formal:
* Salamat - This is the most common and formal way to say "thank you".
* Pasalamat - This is a slightly more formal way to say "thank you".
* Pasalamatan - This is a more formal way to express gratitude.
Informal:
* Salamat ha imo - "Thank you to you."
* Salamat gud - "Thank you very much."
* Salamat kaayo - "Thank you so much."
* Salamat sa imo - "Thank you for that."
For Specific Situations:
* Salamat ha pagtabang - "Thank you for helping."
* Salamat ha pag-abiabi - "Thank you for the welcome."
You can also use expressions like "naka-apresyar ko" (I appreciate it), "dako an akon pasalamat" (my thanks are many), or "dako an akon pagpasalamat" (my gratitude is great) to express deeper appreciation.
The best choice of phrase will depend on the situation and your relationship with the person you are speaking to.