was there a "terminal" oxygen that was assigned an H earlier? does that oxygen need more electrons to form an 8et?
place a number of electrons necessary to form an 8-et (or if not enough left, then place just whatever number of electrons was leftover)
on this oxygen  
remove these electrons from T continue
                                      

does the central atom need more electrons to form an 8et?



         
  continue  
place the number of electrons necessary to form an 8-et (or if not enough left, then place just whatever number of electrons was leftover)
on the central atom  
remove these electrons from T continue