The document discusses grammar concepts related to the verb "to be" in English. It provides examples of using the verb "to be" in singular and plural forms with different subjects like "I", "you", "he", "she", "it", "we" and "they". Short forms of the verb are also listed. Two exercises follow, asking students to fill in blanks with the correct forms of "to be" or articles "a", "an" and "the".