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朋友是美国公民，与中国太太结婚十余年，且在中国生活，如今回到美国。太太持B1/2签证入境，如何转换成绿卡？
-Wait for about 3 months, then your friend files I-130 and his wife files I-485 together.

都需要准备哪些材料？
-Read the I-130 instructions and I-485 Instruction. Or Google to find the related information.