H1 to F1 question

Can anyone help to give your opinions for the following questions? THX:
1. What's the legal time gap between H1 and F1? i.e., after laid-off of H1, how soon the application of F1 should be filed?
2. can anyone provide a sample of explanation letter, which helped to change H1 to F1 successfully?
3. Do I need to show I don't have immigration intention? As you know, H1 allows us to do so, however F1 doesn't.

所有跟帖： 

• 回複：H1 to F1 question -question!- ♀ (240 bytes) () 11/07/2004 postreply 18:42:19

• 回複：回複：H1 to F1 question -stupid8888- ♀ (150 bytes) () 11/07/2004 postreply 21:06:03

• 回複：回複：H1 to F1 question -rosemaryro- ♀ (347 bytes) () 11/07/2004 postreply 23:50:19

• 回複：H1 to F1 question -stupid8888- ♀ (689 bytes) () 11/07/2004 postreply 21:13:44

• Thank you very much!!! -rosemaryro- ♀ (0 bytes) () 11/07/2004 postreply 23:39:14

• 回複：回複：H1 to F1 question -rosemaryro- ♀ (165 bytes) () 11/07/2004 postreply 23:54:17

• 回複：回複：回複：H1 to F1 question -ieieiieie- ♀ (204 bytes) () 11/08/2004 postreply 07:32:31