This document discusses 5 factors that affect second language learning: 1) Aptitude, including natural ability and skills, which Gardner and Skehan found to be a major determinant of success. Some learners struggle with word functions and applying grammar rules. 2) Motivation, as unmotivated learners who don't see a need to use the second language are less likely to adopt learning strategies. 3) Learning difficulties, as second languages are not linked to intelligence, so some with difficulties can still succeed. 4) Proficiency, with both low and high proficiency learners using communication strategies effectively, though in different ways. 5) Gender, as females reportedly use social and metacognitive strategies more, while males favor metac