How can i create a form with the previous - next questions?

I need to create a form without the previous - next questions, i mean one with all the fileds in one

Are you referring to convert your current Single Questions in One Page Layout to Multiple Questions in One Page Layout?

Please follow this screencast to know how to change your form layout:

I guess this is what your were asking for.

If you have any different query, please let us know.

 yes this is it, thanks a lot