学了pjiang老师的"绿卡之后换工作的 180 天". I still have a couple of questions:
绿卡 was sponsored by Company A in U.S. Is there any problem if I leave from company A and go to work with my previous company B in Canada after 绿卡之后180 天?
How about if the total time I work with company A is just one to two years even after 180 days? any fraud issue?
How about commute every day: live in US and work in Canada? Any problem during crossing border?
Thanks!