The document discusses the present progressive tense in English. It is used to describe actions that are ongoing or temporary. The present progressive is formed using a form of to be plus the present participle (-ing form) of the main verb. It emphasizes the ongoing nature of an action or state. There are some spelling rules to follow when adding -ing, such as doubling final consonants or changing 'ie' to 'y'. Examples are provided to illustrate the use of the present progressive in affirmative, negative and interrogative sentences.