For K visa: what documents do you need to prove that you can leg chemin2010-09-13 23:10:14

In the instructions for Form I-129F, No 5B. Provide original statements from you and your fiance(e) whom you plan to marry within 90 days of his or her admission, and copies of any evidence you wish to submit to establish your mutual intent

Q: What should be includ in the statements? What evidence to establish your mutual intent? Photos? exchanged emails? Trip made together? No any idea! Please help, Qian Beis! Thanks!