The document discusses verbs and verb tenses, including: - The verb "to be" and examples of its use and non-use in sentences about Barcelona. - Regular verb conjugations using suffixes like "-ed" and changing "y" to "i". - Irregular verb structures and examples like "bought". - Forming negative sentences with regular and irregular verbs using "didn't". - Question formations for regular and irregular verbs using "did". - Examples of correct and incorrect verb usage in questions about visiting Barcelona locations.