This document summarizes a case study comparing the Spanish and English languages from the perspective of helping a student learn English as a second language. It describes how the student immigrated from Puerto Rico and lacks proficiency in his native Spanish. It identifies differences and similarities between Spanish and English phonology, grammar, and vocabulary. Examples are provided of common errors made by the student in English. The conclusion emphasizes how the student's Spanish proficiency affects his English acquisition and strategies like focusing on cognates to help with language transfer.