This means many students in the same school are friends.
"(Ustedes) son estudiantes" (Vosotros, as) sois estudiantes
You should say: Tú eres estudiante. OR Ustedes son estudiantes. Tú is singular familiar and ustedes is plural formal, so it depends on what you are trying to say.
alumnos is another word that means "students". I find that it is usually used more when referring to younger students, however alumnos and estudiantes can be used interchangably. "como son los alumnos" is asking "how are the students" meaning, what is their personality like, how do they look, etc.
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Ustedes son is the formal way of saying "You guys are.", "Or it was them"
If the pencils are y'alls, then you say...Sí, los lápices son de ustedes. If the pencil's aren't y'alls, then you say...No, los lápices no son de ustedes.
Translation: Todos ustedes It is used when talking to a group of people.
Ustedes son bromistas. You could also say: Ustedes son embusteros. The word embustero refers to a joke intended to deceive.
A. -¿De qué estado son ustedes?B. - Somos del Estado de Hidalgo (for instance)
Ustedes son- You are (polite form in plural)
It means "the serious students are studious."