Thanks Pjiang: Does H1 extend 3yr,485 pending EB3 not #?

Thanks Pjiang:
1. Does H1 extend 3yr,485 pending EB3 not # right now?
2. Does H4 used EAD extend 3 yr with H1, too?
3. Does USCIS know H4 used EAD for 3-4 month?