因父母10年前探親簽證拒簽， 他們不想再去簽證，母親年紀80 歲， 特想看看我在美國的生活， 我就給老母辦了移民簽證，她從國內過來了兩個星期了， 在等綠卡，一般多長時間能拿到綠卡？
-Normally she can receive the physical green card in about one month. But if she want to go back to China, she can leave any time even if before she gets the physical green card.
如果她想回國， 可不可以在未等到拿到綠卡之前回國，
-Yes, of course. She can return to US within one year even if she just her passport which has the green card stamp got at the port of entrywhen she entered US using the immigration visa.
我在這裏收到綠卡後再寄給她？
-Of course yes and that will be good. But she can not stay in China for > one year unless she apply for the reentry permit. Otherwise, her green card will be invalid.
進入中國海關會有問題嗎？
-Not at all.
實際上我並不知道以後母親還會來嗎，因年事以高，象我們這種情況， 最好怎麽做？
-She had better apply for the reentry permit which can allow her to stay in China for > 1 year < 2 years continuously.
謝謝
