Yes They Can
Nope.
Getting married to an American citizen.
You can help an illegal alien become legal by helping them fill out the appropriate applications for residency and paying the needed fees. This will put them on the right track to becoming a legal resident or citizen.
no
Yes, but only if you apply for a green card.
of course it can
no
There is not any way for an illegal alien to become legal except through application to the government. Age and time in the country are not an automatic way to become legal.
Absolutely not.
Absolutely not.
No.