Formal:
* Dahil - This is the most common and formal way to say "because."
* Sapagkat - This is also formal and is used in more literary contexts.
Informal:
* Kasi - This is the most common informal way to say "because."
* Kaya - This translates to "therefore" or "so," but it can also be used to mean "because" in casual conversation.
Examples:
* Dahil sa ulan, hindi ako makalabas. (Because of the rain, I can't go out.)
* Sapagkat mahal kita, gagawin ko ang lahat para sa'yo. (Because I love you, I will do everything for you.)
* Kasi pagod na ako. (Because I'm tired.)
* Kaya nag-aaral ako ng mabuti. (Therefore, I study hard.)
You can choose the appropriate translation based on the formality and context of your sentence.