For the country like ours', Nepal..it's way difficult to get F1 visa (almost impossible) for a spouse of a green card holder....Even so many prople are getting rejected for F1 visa just giving the reason that the counsel thinks the person is not gonna return back....and a spouse a green card holder!!!! The only and solid reason for their rejection will be that the person will not return since his/her spouse is a US resident....

But sometime u don't know.. u might be lucky.....