What are they requesting, more continuous residence evidence?
Here's one example of an affidavit that can be used by a friend or family. It should give you a general idea of what to include in the affidavit. If you're going to get one from a business or school, church, etc. It can be different.
http://www.mediafire.com/view/9xiw60...AVIT_daca.docx
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Self filed AOS │Apps Received By USCIS - 3/18/19
│Biometrics Done - 4/11/19
Interview Scheduled - 4/24/19│Interview Date - 5/31/19│AOS Approval - 5/31/19
Permanent Resident Card Received - 6/8/19