This a great song! It's also great to discuss the distinct uses of the preterite and imperfect tenses. There is a word bank with verbs in the preterite/imperfect tenses. Students can listen and fill in the missing lyrics of the song.
After listening a couple of times, students answer comprehension questions about the message of the song. In addition, they look at how the imperfect and preterite tenses are being used differently to express past occurrences.