Think up a scenario in your head, and then state the facts in an affidavit. An affidavit is your statement of facts about your case – your evidence.You sign the bottom of the statement to confirm that what you've written is true. An affidavit is a written statement of fact that is sworn or affirmed under oath as being the truth. It is best that your affidavit be typed on a computer. I confirm that all of the information in the Notice of Application is correct. Present the facts in your affidavit in an organized way. Use numbered paragraphs. 1. Talk to the person immigrating to the US. The person for whom you write an affidavit should be someone you know very well. Learn to craft a compelling affidavit with our stepbystep guide.