JotForm is a free online form builder which helps you create online forms without writing a single line of code. No sign-up required.
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I am not exactly sure about what you want but base on your title you're looking for a dynamic form. Is this about dynamic fields which users can automatically add dynamically within your form? If yes, we have few dynamic field widgets that you might want to try.
Let us know if you need anything else.
i was looking for something like
Name: Blah Blah
Address: blah blah
Do you agree
yes or no
The name and address bit is filled by us,
the yes and no bit is a radio button.
when we send an e-mail it has the name and address bit filled by us and the user has to only click on yes/ no.
Can this be done?
Yes this can be done you have to use prepopulation feature to make the value in Name: and Address populated then make the field as "Read Only" so it won't be editable.
View this sample in this link. Follow this guide on how to prepopulate fields to your Jotform via URL parameters.