If you're asking a question like "Are you...?"
* Sei... (formal and informal singular, for "you")
* Siete... (formal plural, for "you")
* Siamo... (informal plural, for "we")
* Sono... (plural for "they", or singular for "I")
If you're stating a fact like "They are...," or "We are..."
* Sono... (plural for "they", or singular for "I")
* Siamo... (informal plural, for "we")
* Siete... (formal plural, for "you")
Example:
* Sei italiano? (Are you Italian?)
* Siamo amici. (We are friends.)
* Sono stanchi. (They are tired.)
To be more specific, please provide the full sentence you're trying to translate.