[SOLVED] letter of affidavit to remove condition on a permanent resident card

Help me study for my Management class. I’m stuck and don’t understand.

Prepare a good letter of affidavits sworn to or affirmed by at least two people who have known both of you since your conditional residence was granted and have personal knowledge of your marriage and relationship. (Such persons may be required to testify before an immigration officer as to the information contained in the affidavit.) The original affidavit must be submitted and also contain the following information regarding the person making the affidavit: his or her full name and address; date and place of birth; relationship to you or your spouse, if any; and full information and complete details explaining how the person acquired his or her knowledge.