Simple yes/no to php

I'm afraid I don't have an illustration as to what I'm trying to do as I can't seem to get my head around it. Imagine a form that has its answers transfered to a php file which transfers the info to an email address. It all works well the form I havce created and it is sent willingly to the email address.

What I would like is to have a simple yes/ no proceedure for some answers. Can anybody give me a swi illustration showing me how I can effect this and transfer the answer (being it pressed yes or no) to the php file (script included.

With thanks.:)

Brian