How to study outside of US and keep green card

My son is studying in Canada and need to live there for another two years. Can he submit some kind of application/form to get a permit to live outside of US and keep his green card? Thanks

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    reentry permit, i-131 -gc2020- 给 gc2020 发送悄悄话 (0 bytes) () 07/23/2007 postreply 18:43:25

    回复:Isn't i-131 just for the time of I-485 pending? -wwwwwwww- 给 wwwwwwww 发送悄悄话 wwwwwwww 的博客首页 (19 bytes) () 07/23/2007 postreply 18:54:37

    回复:回复:Isn't i-131 just for the time of I-485 pending? -gc2020- 给 gc2020 发送悄悄话 (59 bytes) () 07/23/2007 postreply 19:17:20

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