Y'all - the second-person plural. ("Y'all" isn't exactly standard English, but it's as close as English comes to having a distinct plural You, and we had to call this *something*.)

By default, we treat Y'all as a synonym for You, since there's rarely any reason in an IF context to distinguish them. The main value in natural language is in group conversation, where it can be useful to clarify whether the speaker is addressing the whole group or just an individual. In IF, though, this is never ambiguous: the addressee is either explicitly stated in the command, or it's the player character. The only thing we could do with a plural is check that the verb agrees in number, and chastise the player's sloppy grammar if not. But that would be contrary to our general philosophy that we should be as lax as we can about the input grammar, to minimize the player's typing workload. So our advice here is to implement a grammar rule for the various YOUs that treats all of the second-person pronoun forms as synonyms for the basic singular YOU.

Yall :   Pronoun