In this case you need to inform the closest US embassy or consulate.For a replacement you would have to file the Form I-90.If you have a copy of the green card that would be very useful.
Of course you can. I think you can go uptil 11 months. On the 12th month you lose your card
No. However, if you will stay outside the U.S. for more than six months, you need to apply for a Re-Entry Permit before you go, or you could lose your permanent residency. See the link below for further detail on international travel by green card holders.
How long a person with green card can stay out side US if he is a United Nation employee?
approx. six months.
As a green card holder you might have to stay outside US for more than 6 months at a stretch. After a year in US as a green card holder in case for example you need to stay outside US for employment reasons then you can file Form N-470 to preserve residence. Trips outside US as a green card holder should not exceed 180 days per trip. If you are going to stay outside US for more than a year remember to apply for reentry permit and get it approved before leaving US by filing Form I-131. Also green card holder should pay the relevant taxes to show his intention to continue to be a green card holder and not abandon his residence and status in US while staying overseas.
It depends on the time period you are planning outside US. If its within a year using green card itself you can reenter US. In case you are planning to stay outside US for more than a year but less than 2 years of time a reentry permit is required to return to US.
It all depends where the foreign national spouse lives inside or outside of the US. If the couple is not yet married and the foreign spouse is outside the US and wishes to get a marriage green card which in the US then you have to apply for a K-1 Fiance visa.
A child that has a green card cannot stay more than one year outside the USA. A green card holder has to spend at least 6 months inside the US each year.
Then the alien loses the green card- if still outside the U.S.
At the point of entry the valid green card can be showed provided the time period outside US is less than 180 days. Else additional documents are required.
If the marriage was purely for the purpose of obtaining a Green card and if the USCIS comes to know of it, then the Green card will be revoked. The person will get to lose the legal permanent resident status.
Using the green card and passport you can travel abroad provided the stay outside US is for a maximum period of 180 days. If you plan to stay for more period of time you should file for reentry permit which is valid for 2 years to reenter US using immigration form I-131 travel document. After a year as a green card holder if for work or any purpose you need to stay outside US you can preserve your residence in US for naturalization purposes later.