ok sorry for this confusion.....my sister's green card is not expired..it is still valid.....when i say renew i mean reentry permit.....so first she got green card when she came to US(2004)....then she went back for medschool,,,then she came back after 11 months(2005)....and got a reentrypermit for two years....so she came back to US next time in two years(2007)..then she applied for another reentry permit(you can only do it twice)...so she has to come back at the end of the 2009 now....i hope it helps...also if you can answer my questions,,,it would be helpful too thanks..