The document discusses present and past progressive verb tenses in English. The present progressive is formed using a present participle verb ending in "-ing" combined with a form of the verb "to be" and indicates an ongoing or temporary action happening now or in the future. The past progressive similarly uses a past participle verb with a past form of "to be" and describes actions that were ongoing or in progress at some point in the past. Both tenses can be used to talk about simultaneous or sequential actions.