This learning module is designed to provide the prospective teacher of English as a second-language with an overview of the contrasting features of the English and Spanish sound systems and practical classroom applications. After completing the learning activities in the module, the student is expected to be able to: (a) explain the main differences in pronunciation between English and Spanish vowels; (b) point out features of vowels, consonants, and consonant clusters that may cause linguistic interference for a Puerto Rican Spanish-speaker learning English; (c) outline an effective strategy for teaching English sounds to Puerto Rican Spanish-speakers; and (d) prepare a corrective exercise for one aspect of each of the components based on a contrast of the sound systems of English and Spanish. Optional and required enabling activities and pre- and post-assessment instruments are included in the module. (HMD)