我用am,你用are; I am a student.You are a teacher. Is连着他她它, He/She is my friend . It is a dog. 还能用于这和那;This is my classmate. That is a car. 单数Is 复数are Those are the students from Japan.
第2个回答 2012-10-15
I用am, you用are , is 用于他(he)她(she)它(it),单数用is,复数用are.就这样!
第3个回答 2012-10-16
I用am, you用are , is 连接他(he)她(she)它(it);单数名词用is,复数名词均用are.