The document discusses the present continuous (progressive) tense in English. It explains that the present continuous tense is formed using "be" plus the verb ending in "-ing". Examples are provided of affirmative sentences using "is", "are" and verbs like "sit" and "lie". The document also covers negative sentences using contractions like "isn't" and "aren't" as well as interrogative forms and answering questions about what someone is doing using the present continuous tense.