The document is from an English grammar textbook. It presents tables to practice using the verbs 'to be' in the affirmative, negative, and question forms for singular and plural subjects. This includes the forms 'was/were', 'wasn't/weren't', and questions with 'was/were'. It also covers using 'there was/there were' and 'there wasn't/there weren't' in sentences. The tables ask students to fill in the correct forms of the verbs to practice their usage.