Preterite vs. Imperfect Usage
Spanish Verb Trainer at Verbuga.eu- First select desired tense (tiempo) or tenses. Select (Pretérito) Indefinido for Preterite and (Pretérito) Imperfecto for Imperfect. Next select the verbs you want to practice ("Todos" for all verbs of that category). Finally click "De Acuerdo" to begin.
Preterite vs. Imperfect Excercises by Enrique Yepes at Bowdoin College
Video and Lesson on Preterite vs. Imperfect by Señor Jordan.
Preterite vs. Imperfect: Part I at Study Spanish.com- Basic explanation of preterite versus imperfect use along with some additional resources on the left hand navigation. (Basic Quiz, Mini-Test, and Oral 1 are accessable without a paid account)
Preterite vs. Imperfect: Part II at Study Spanish.com- Additional explanation of preterite versus imperfect use along with some additional resources on the left hand navigation. (Basic Quiz, Mini-Test, and Oral 1 are accessable without a paid account)
Preterite vs. Imperfect: Part III at Study Spanish.com- Even more explanation of preterite versus imperfect use along with some additional resources on the left hand navigation. (Basic Quiz, Mini-Test, and Oral 1 are accessable without a paid account)