[html] Is it correct to use DIV inside FORM?

No, its not

<div> tags are always abused to create a web layout. Its symbolic purpose is to divide a section/portion in the page so that separate style can be added or applied to it. [w3schools Doc] [W3C]

It highly depends on what your some and another has.

HTML5, has more logical meaning tags, instead of having plain layout tags. The section, header, nav, aside everything have their own semantic meaning to it. And are used against <div>