But if your PERM is denied before you extend your H1 beyond the 6 year limit, you may have to leave U.S. or change your status.
Another artilce for your homework: 
see the left icon in this webpage: 六年之後 H-1B 的延期
回複:回複:Pijiang, HELP! Labor Certificate is pending, H1B extension
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                    what if when my H1B extension is pending and I get the perm deny
                     -蟲子在線- 
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                        12/22/2009 postreply
                                                21:32:34
                    
                    
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                    my perm pending is over 1 yr, can I extend my H1B now?
                     -蟲子在線- 
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                        12/22/2009 postreply
                                                22:25:00
                    
                    
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                    thanks 10 millions! I found answer in your link, thanks very muc
                     -蟲子在線- 
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                        12/22/2009 postreply
                                                22:31:53