Head-directionality parameter in the context of Principles and parameters

Filipino (English: /ˌfɪlɪˈpiːnoʊ/ FIL-ih-PEE-noh; Wikang Filipino [ˈwikɐŋ filiˈpino]) is the national language of the Philippines, the main lingua franca, and one of the two official languages of the country, along with English. It is a de facto standardized form of the Tagalog language, as spoken and written in Metro Manila and in other urban centers of the archipelago. The 1987 Constitution mandates that Filipino be further enriched and developed by the other languages of the Philippines.

Filipino, like other Austronesian languages, commonly uses verb-subject-object order, but can also use subject-verb-object order. Filipino follows the trigger system of morphosyntactic alignment that is common among Philippine languages. It has head-initial directionality. It is an agglutinative language but can also display inflection. It is not a tonal language and can be considered a pitch-accent language and a syllable-timed language. It has nine basic parts of speech.

An adpositional phrase is a syntactic category that includes prepositional phrases, postpositional phrases, and circumpositional phrases. Adpositional phrases contain an adposition (preposition, postposition, or circumposition) as head and usually a complement such as a noun phrase. Language syntax treats adpositional phrases as units that act as arguments or adjuncts. Prepositional and postpositional phrases differ by the order of the words used. Languages that are primarily head-initial such as English predominantly use prepositional phrases whereas head-final languages predominantly employ postpositional phrases. Many languages have both types, as well as circumpositional phrases.