回复：紧急求助：这种情况有什么办法可想？

After J visa expires, there is one month grace period. J status can not be changed to B-1 status within U.S. without J-1 waiver. J status could be changed to F-1 or O-1, but need to go outside U.S. (Mexico, Canada or China) to get a visa to activate the status.