我是兩年前通過H1B得到的綠卡，先生以前是H4來美，近兩年都是B2. 現在他想申請綠卡。我翻看了相關的帖子，我的理解是：
1. 他目前B2的身份在美國，他可以直接file 485；
2. 他需要等2-3個月後再file 485嗎？-He had better wait for two to three months to file I-485 in case USCIS consider that he has the immigrant intent before he entered US using B2 visa (visa fraud).
3. 他的B2是6個月的，到期了怎麽辦？需要離開美國再入境嗎？ 那時用什麽簽證？-After he files I-485, he can legally stay in US to wait for the green card approval even if the 2 status expires. If he wants to leave US during I-485 pending, he needs to apply for advance parole to travel.
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