我(I)用am,你(you)用are,is连着他(he),她(she),它(it);这些是固定用法:I am a boy. (你不能说 I is a boy)You are a student.He is a boy.She is a girl.It is a cat.单数名词用is,复数名词全用are。(主语个数是一个时,谓语用单数is,主语个数为2个或以上,谓语用复数are.)如:The book is over there.(一本书)The books are over there.(多本书) 变疑问,往前提,句末问号莫丢弃。(陈述句中谓语为is,are,am时,变疑问句只将其提前)如:It is ...