CitizenPath has prepared a downloadable I751 affidavit sample that you can forward to friends who are willing to write a letter of support. For completed examples of some legal forms, see our Self Help Form and Sample Packets page.Handwritten forms are hard to read. You may complete the fillable form and print, or print and then complete the form. Online forms can be completed and submitted using our self-service portal. An affidavit or letter can be used to fill gaps, corroborate or support other evidence or explain shortcomings or weaknesses in a petition. I am providing this affidavit to verify my income as I have no other income documentation available to me. An affidavit or letter can be used to fill gaps, corroborate or support other evidence or explain shortcomings or weaknesses in a petition. Be sure to download and save the form to your computer before completing it. Permit Process Information.