He is English.He is an English.He is an English man.三句是否可互划等号?这三句中是否有存在语法错

问题描述:

He is English.He is an English.He is an English man.三句是否可互划等号?这三句中是否有存在语法错

He is English.=He is an English man\boy.
第二句有错,不加an