The document discusses the imperfect tense in Spanish. The imperfect tense is used to describe past actions without a clear beginning or end, or actions that happened repeatedly. It can also be used for descriptions and mentioning time/date/weather in the past. Some example uses are "Ana cantaba" (Ana was singing) and "Generalmente caminaban mucho" (Generally they would walk a lot). The document provides conjugations of common -ar, -er, -ir verbs as well as the irregular verbs ir, ser, and ver in the imperfect tense. It contrasts the imperfect with the preterite tense, noting the preterite is used for completed, one-time past actions.