Когда стоят местоимения he/she/it пишется "is"( и в косвенных падежах этих местоимений). когда местоимение I пишется am. а "are" пишется во всех остальных случаях.
Is she his wife Is your sister a tailor Are you a fisherman Are they tortoises Is it an eagle Am I a driver Are his brothers pilots Is Kate a sportsman Are your parents engineers Is it a whale
<span>What's her favorite subject? I'm eleven and they're twelve. It's
his birthday. He's sixteen today. What's your name? We're twelve years
old.</span>