The document discusses the proper use of the past tense verbs "was" and "were". It notes that these verbs are the past tense forms of "to be" and are important to use correctly. It provides examples of using "was" and "were" in affirmative, negative, and interrogative sentences with different subjects. The document also fills in blanks with "was" and "were" to demonstrate their use in complete sentences discussing travel in the past.