My wife, who is originally from South Korea, has been in the U.S. for about nine years, first as a student and now on an H-1B visa. I'm a U.S. citizen. We got married one year ago, and are finally getting around to filing the paperwork for her to adjust status and get a U.S. green card. However, I’m confused by whether I have to fill out the Affidavit of Support (Form I-864) for her. In the instructions, it says something about how if the immigrant “has earned or can be credited with 40 qualifying quarters (credits) of work in the United States,” no Form I-864 is needed. What exactly does that mean? Does it help us?