Someone else usually must file the petition for you (often referred to as sponsoring or petitioning for you), although you may be eligible to file for yourself in some cases. Most people who apply for a Green Card will need to complete at least two forms-an immigrant petition and a Green Card application (Form I-485). Go to our Green Card Eligibility Categories page to see all the possible categories you can apply under and what the eligibility requirements are. The eligibility requirements may vary depending on the immigrant category you are applying under. immigration laws provide a variety of ways for people to apply for a Green Card. Before starting the application process, there are two questions that you should answer first: 1.