Im a good boy

Im a good boy ( ) a good-looking boy Iam a Chinese boy.my name is Ma Lin.Im twelve.Im in Class2,Grade1.Im in Row5.的意思 she is a good boy. a,you,boy,are,good(.) to be a good boy im good just im a im a im a Good Boy tom s____ is a really good boy ( )a good looking boy he is! He is a good boy.(感） You are so good a boy.的句子结构怎么分析?so good a boy?so good a boy?不了解so good和a boy并列作表语? He is a good boy.改为感叹句 改错：What good a boy he is! He is a good boy ( )shool