xiaobaitu， 如果配偶是公民，我在拿到绿卡后２年９个月可申请公民，但是还必须满足以下条件：（from USCIS website)
Generally, certain lawful permanent residents married to a U.S. citizen may file for naturalization after residing continuously in the United States for three years if immediately preceding the filing of the application:
the applicant has been married to and living in a valid marital union with the same U.S. citizen spouse for all three years;
the U.S. spouse has been a citizen for all three years
就是说我们必须结婚并在的确在一起生活３年（中间有分居就不行）。
我和我老公２００４年底搬在一起生活，我２００５年４月拿到绿卡，我们２００５年６月结婚。照理说，我不能在在拿到绿卡后２年９个月申请公民，因为那时我们还没有结婚３年，但我们在一起生活３年了。我不知道我这种情况可不可以去碰碰运气，在拿到绿卡后２年９个月申请公民。到时拉上老公去面式，说我们事实婚姻有３年了。你觉得呢？