This document discusses articulatory phonetics and specifically addresses: 1) The articulatory basis refers to how sounds are formed using four dimensions: articulator, point of articulation, cavity, and manner of articulation. 2) It describes voiced and voiceless consonants, where voiced involves vocal cord vibration and voiceless does not. 3) It examines diphthongs in English and Spanish, which involve a complex vowel sound transitioning from one vowel to another within the same syllable.