The boy is Alan?一般疑问句不是 be动词在前么

陈述句式的疑问句.
在口语中经常会有陈述句变成一般疑问句的.朗读时用升调.
比如：
You know.
You know?
He is a doctor.
He is a doctor?
The boy is Alan.
The boy is Alan.