The document discusses various tenses in English including progressive/continuous and perfect tenses. It explains that the progressive/continuous tenses are used to describe actions that are ongoing or in progress, with the past progressive describing actions that were happening in the past, present progressive for actions happening now, and future progressive for actions that will be happening in the future. It then explains that the perfect tenses are used to describe completed actions, with the present perfect used for actions completed now with unspecified time, past perfect for actions completed before a past time, and future perfect for actions that will be completed before a future time.