Many languages have separate singular and plural forms for the second person (ways of saying “you”), but standard English does not. “You” can be addressed to an individual or a whole room full of people.
In casual speech, Americans have evolved the slangy expression “you guys” to function as a second-person plural, formerly used of males only but now extended to both sexes; but this is not appropriate in formal contexts. Diners in fine restaurants are often irritated by clueless waiters who ask “Can I get you guys anything?”
The problem is much more serious when extended to the possessive: “You guys’s dessert will be ready in a minute.” Some people even create a double possessive by saying “your guys’s dessert. . . .” This is extremely clumsy. When dealing with people you don’t know intimately, it’s best to stick with “you” and “your” no matter how many people you’re addressing.
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