November 13, 1936: the Surian ng Wikang Pambansa was established
On November 13, 1936, the Surian ng Wikang Pambansa (Institute of National Language) was established. It was mandated to choose which native Philippine language would be used as the basis for the national language. In 1937, the Surian, under its first director, Jaime de Veyra, recommended that Tagalog be adopted as the national language.
Hence, in 1940, the Institute published an official grammar and dictionary, the Balarila ng Wikang Pambansa (Grammar of the National Language), written by Lope K. Santos, and the Tagalog-English Vocabulary.