Idinagdag sa orihinal na mga titik ng baybáyin ang katinig na R at ginawang lima ang patinig: A, E, I, O, U kayâ dalawampu (20) ang mga titik ng lumaganap na abakada hanggang sa panahong tinatawag ang Wikang. Santos nang kaniyang sulatin ang Balarila (nalathala, 1940). His last request on his deathbed was to have Tagalog designated the Philippine national language. Ang mga titik na ito ang naging batayan ng abakada na binuo ni Lope K. Santos, the author of the Vicassan Dictionary, is his illegitimate son. His middle name was actually Canseco with a “C” - he changed it to a K. Senator during the Fifth Philippine Legislature.Governor of Nueva Vizcaya from 1918 to 1920.Governor of the province of Rizal from 1910 to 1913.His full name is commonly pronounced as Lope “Ka” Santos.Sinusundan ng abakada ang papantig na pagbigkas ng mga titik ng wikang Tagalog na kalapit na kalapit rin sa mga sagisag ng baybyin, ang sinaunang paraan ng pagsulat ng mga Tagalog. Santos at ilang henerasyon ng mga mag-aaral ang natuto ng Wikang Pambansa sa pamamagitan nit. Santos founded the group TANIW, which stands for Taliba ng Inang Wika (Sentinel of the Mother Language). Ginamit ang abakada sa aklat ng balarila ni Lope K. Santos: Eminent literateur and deserving of the most approbation and general applause. Santos wrote the Tagalog poem Ang Matampuhin (The Sulker). Santos was the Director of Institute of National Language from 1941 1945.

His most famous works are the Balarila ng Wikang Pambansa (Grammar of the National Language) and the novel Banaag at Sikat (1906), known as the “Bible of working-class Filipinos.”

Santos (1879 – 1963) is known as the “Father of the Philippine National Language and Grammar.”

Abakada ni lope k santos