The document discusses the irregular verbs in the future tense in Spanish. It notes that while the endings are the same as the regular future tense, some verbs have irregular stems. It provides examples of verbs that replace letters like "d" for "i/e", drop the "e", or replace two letters. The document then lists and gives examples of the conjugations of some common irregular verbs in the future tense like "tener", "salir", and "decir".