| A | B |
|---|
| Used to speak of background information in the past | imperfect |
| Completed actions in the past | preterite |
| Used to describe weather. | imperfect |
| Used to speak of habitual actions in the past. | imperfect |
| When amount of times an action is completed is specified. | preterite |
| Used to describe dates. | imperfect |
| Used to describe physical appearance. | imperfect |
| Used to describe mood or emotion. | imperfect |
| Used for describing progressive actions in the past. | imperfect |
| Used for sentences that contain "siempre". | imperfect |
