Conditional Residents
Applicants who qualify for a visa on the basis of a marriage which was entered into validity less than two years prior to the date on which he / she was admitted into the United States as an immigrant, or in the case of a fiancé(e) visa holder completes an application for an adjustment of status, will be granted conditional resident status for a two year period.
The status is conditional, because you must prove that you did not get married to evade the Immigration laws of the United States.
Ninety days before the two year anniversary of being granted conditional resident status, both the petitioner and the conditional resident are required to file a form I-751, with the U.S. Citizenship and Immigration Services to have the conditional resident status removed.
The expiration date on your green card is also the date of your second anniversary as the conditional resident.
In case that you both fail to file form I-751on time conditional resident could lose his/her status and could be removed out from the country. To prevent the removal the U.S. citizen or Lawful Permanent Resident relative is required to file a new immigrant visa petition with the U.S. Citizenship and Immigration Services and conditional residents of the United States are required to apply for a new immigrant visa.
Conditional residents are not eligible to apply for special immigrant status as a returning residents SB-1.