【原创】想知
mary is my claasmate. mary is eating ice cream.
是不是可以改成下面那样
1 mary who is my classmate , is eating ice cream （错误）
2 mary is my classmate eating ice cream （错误）
My classmate Mary is eating ice cream.（正确）
Mary,my classmate, is eating ice cream. （正确）
Mary, who is my classmate , is eating ice cream ( 其中的 who is my classmate 是非限制性定语从句，必须用逗号与其它部分隔开)