Much confusion surrounds the need to submit I751 affidavits and how to write them. We explain and provide an I-751 affidavit sample.To support a I751 petition and show that the marriage is "bona fide," couples must submit evidence that helps establish that the marriage is genuine. Learn how to create an effective affidavit of support with our detailed guide and sample. Next, provide the student's name and the program they are enrolled in.