Formal:
* Magandang araw po. (Good day) - Used for someone older or someone you don't know well.
* Magandang hapon po. (Good afternoon) - Used for someone older or someone you don't know well.
* Magandang gabi po. (Good evening) - Used for someone older or someone you don't know well.
Informal:
* Hello. (This is the English word and is commonly used)
* Kumusta ka? (How are you?)
* Musta? (Shortened version of "Kumusta ka?")
* Uy! (Hey!)
* Pare! (Bro!) - Used among male friends.
Note: The "po" at the end of the formal greetings is a sign of respect, similar to "sir" or "ma'am" in English.
It's also important to consider the time of day when choosing a greeting.