This study examined the production of tense and aspect morphology in the oral and written narratives of fifty-two students (17 Spanish L2, 30 Spanish L1 bilingual, and 5 Spanish dominant English language learners) upon completing eighth grade in a Spanish-English two-way immersion school. Distribution of preterite and imperfect forms followed the patterns found in previous research, namely, the preterite was used mostly for achievements and imperfect mostly for statives. There were no significant differences in morpheme distribution among the three groups of students, which may constitute further evidence against the Lexical Aspect Hypothesis. However, the three groups of students were differentiated by accuracy, with higher levels of Spanish proficiency resulting in more accurate production of preterite and imperfect. Spanish L2 and bilingual Spanish L1 students produced errors in the use of preterite with stative verbs, as has been found elsewhere (cf. Montrul 2002; Silva-Corvalán 1994).