No - you need a passport too.
yes they can do that
Doesn't matter if you have a green card. It depends on your nationality.
No
puerto ricans do not have to have a green card to enter or work all they need is a passport and they will be fine puerto ricans do not have to have a green card to enter or work all they need is a passport and they will be fine
No, it is not mandatory for green card holders to posses a machine readable passport (as the green card is machine readable).
That is allowable.
No they cannot. You must be a US citizen to enter.
Any country than an American citizen can go to, but only from the US(show the Green Card and passport in destination country) and back to the US or your home country. Just don't forget your passport and a Green Card anywhere!
A Canadian citizen with a green card can use their Canadian passport to exit the US and use their US green card to re-enter the US under the same status. Hope this helps.
Yes provided that relative is a permanent resident or green card holder or a US citizen. Once they petition for relative depending on the eligibility and availability of visa the relative would be issued a immigrant visa to enter US after which will be issued green card.
It is possible to get a Green Card even if you have entered illegally. Since you are on a valid visa now, it will help you get the green card. The illegal stay in the US may affect the Green card application process to some extent which depends on how long you were illegally staying in the US.
No - a Green card means your a permanent legal resident. ESTA is only used for Visa holders and waivers