This document discusses the role of applied linguistics in teaching English in Saudi Arabia. It explains that applied linguistics helps English teachers analyze errors made by students and identify areas for improvement. Error analysis examines transfer errors from students' first language and intralingual errors developed in their learning of English. Contrastive analysis also helps identify differences between a student's first language (Arabic) and their target language (English) that may cause difficulties. The document provides several examples of how the sound systems and specific phonemes of Arabic and English differ, which challenges Saudi students in pronouncing English. Applied linguistics gives teachers tools to understand sources of errors and design effective teaching strategies that account for the influences of students' first language.