Lewis Structure on (CH3)2NO?
Name of the compund: Dimethyl nitroxide
Lewis structure:





The properly way to determine the Lewis structure, based on this example, is:


Total valence electrons: $4\cdot2 + 5 + 6 + 1\cdot6 = 25$
Total electrons needed for octets/doublets: $8\cdot4+2\cdot6 = 44$
Total shared/bonding electrons: $44 - 25 = 19$ (In other words, there is only nine single bonds and one electron left.)
Total electrons in lone pairs: $\text{Step 1} - \text{Step 3} = 25 - 19 = 6$ (In other words, the are only 3 pairs of lone electrons.)

Furhter information on how to draw Lewis structures, please follow the link
Further information of related Lewis structures and how this knowledge is applied on real top science, I recommend seeing this reference: Moreira, G.; Charles, L.; Major, M.; Vacandio, F.; Guillaneuf, Y.; Lefay, C. and Gigmes, D. Beilstein J. Org. Chem., 2013, 9, 1589 - 1600.