Example formal charge calculations: S--> 6 - (1/2)8 = +2, O without H --> 6 - 6 - (1/2)2 = -1, O with H --> 6 - 4 - (1/2)4 = 0.  Notice that the sum of the absolute values of the formal charges is 4, although this species is uncharged.  This suggests that the Lewis structure is not very good.  We will see how to make it better in step 8.