question about green card

My hu*****band and i applyed the canada green card for backup.It was approved in Dec 7 2004.It is a good news for us.But we still want the USA green card.We need to move to Canada within next 4 years.Can somebody has the good ideas how can we do will keep two green card valid?Because if you no lognger live in USA half a year or live in canada 3 years within 5 years.Your green card will be voided.I appreciate your respond.

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• 回复：question about green card -sdfsdfsdff- ♀ (356 bytes) () 12/09/2004 postreply 11:59:43

• 回复：回复：question about green card -lightsay- ♀ (337 bytes) () 12/09/2004 postreply 12:25:28

• 回复：回复：回复：question about green card -sdfsdfsdff- ♀ (749 bytes) () 12/09/2004 postreply 14:51:06

• 回复：question about green card -法居士- ♂ (644 bytes) () 12/09/2004 postreply 12:20:49