Formal:
* Sino ang mga (This is the most common and formal way to ask "who are")
* Sino sila (This is also formal but less common than "Sino ang mga")
Informal:
* Sino kayo (This is informal and can be used with friends or family)
* Sino sila (This can be informal or formal depending on the context)
Example Sentences:
* Sino ang mga tao sa larawan? (Who are the people in the picture?)
* Sino sila? (Who are they?)
* Sino kayo? (Who are you?)
Note: The word "mga" is used to indicate that the subject is plural (more than one person). You can use "ang" instead of "mga" if you are referring to a single person.
It's important to note that the appropriate word choice also depends on the grammatical structure of the sentence.