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Past Tenses: Preterite & Imperfect

Preterite for completed actions
El aspecto en el español: sistema tripartito
Aspect in Spanish: tripartite system
Perfective (preterite) / imperfective (imperfect) / perfect (ha+participle)
Three-way aspect distinction in Spanish past tenses
Aspecto perfectivo e imperfectivo en subjuntivo
Perfective and imperfective aspect in subjunctive
Quiero que comas (impf.) / hayas comido (perf.)
Aspect distinction maintained in subjunctive mood
Aspecto en el futuro: future perfect vs simple future
Aspect in the future: future perfect vs simple future
Habrá terminado vs terminará — completed vs ongoing future
Aspectual meaning of future perfect
El gerundio como aspecto continuo
Gerund as continuous aspect
Estoy comiendo (progressive) vs como (simple)
Progressive periphrasis and aspect
Aspecto léxico e inferencia pragmática
Lexical aspect and pragmatic inference
Juan nadó dos horas — telic reading despite atelic verb
How context overrides lexical aspect
El aspecto en las perífrasis: llevar
seguir
volver a
Aspect in verbal periphrases
La interfaz aspecto-modalidad: debía de estar
Aspect-modality interface
Debía de estar cansado — imperfect modal for past probability
Modal and aspectual meanings combined
El aspecto en el habla infantil y adquisición del español
Aspect in child speech and Spanish acquisition
Early learner errors: confusion of preterite and imperfect
Acquisition order of aspectual distinctions
Aspecto en el español como L2: errores frecuentes
Aspect in Spanish as L2: frequent errors
Common L2 errors in preterite/imperfect choice
Pedagogical implications of aspectual complexity
Análisis del aspecto en textos de prensa
Aspect analysis in press texts
News Spanish: preterite for events
imperfect for background