The document discusses the past tense forms of the verb "to be". It notes that the past tense of "I, he, she, it" is "was" while the past tense of "we, you, they" is "were". Examples are provided to illustrate how to use "was" and "were" in statements, yes/no questions, and wh-questions. The document also covers how to form negatives using "wasn't" and "weren't".