The document discusses the continuous tenses in English, which are used to describe actions that are ongoing or in progress. The continuous past tense, also called the past progressive tense, uses "was/were + verb+ing" to talk about actions that were happening at a specific time in the past. The continuous present tense, also called the present progressive tense, uses "is/am/are + verb+ing" to talk about actions that are happening now or around the present time. Both tenses can be used in affirmative, negative and interrogative forms.