Commonwealth Act No. 570

: It declares the Filipino national language as one of the official languages of the Philippines effective on July 4, 1946.
: It took effect on the fourth day of July, nineteen hundred and forty-six (July 4, 1946).
: No. The law states Filipino is “one of the official languages,” not the sole official language.
: The Bureau of Education supervises the preparation of textbooks.
: Textbooks for primary schools written in the national language, or those necessary for propagating it.
: Textbooks prepared by the Bureau of Education are subject to approval of the Institute of National Language insofar as their language form is connected.
: It means the Bureau of Education’s supervised preparation of the textbooks must be approved by the Institute of National Language regarding the relevant language form aspects.
: By the medium of public and private schools and other agencies and methods of popularization.
: It approves the language form of textbooks (as connected) prepared under the supervision of the Bureau of Education.
: June 7, 1940.
: It shall take effect upon its approval (per Section 3), while Section 1 specifies the official-language effectivity date of July 4, 1946.
: CA No. 570 takes effect upon approval generally (Section 3), but the specific change that makes Filipino an official language is effective on July 4, 1946 (Section 1).