The past progressive, or, el pasado progresivo. This tense changes the present progressive to the past. For example, If i said i am talking, esta hablando, that would be the present. If i wanted to say i was talking, it would be, estaba hablando. Learning this tense allowed me to build upon my prior knowledge of a tense. This is a skill that can easily aid me if i ever find myself in a country where i need to learn the native language. Building upon proir knowledge is very important and i am very happy i was able to do this today.