"它的内容是什么?"用英语怎么说

what's the contents ot it

What's its content?

它的内容是什么

what's the contents of it

What is about?

What does it content? 它包含了什么,即它的内容是什么
或what's the contents of it ?
前一句的 content是动词,所以前面用does不用be
后一句的 content是可数名词．