The document discusses the subjunctive mood in Spanish and provides a list of common trigger phrases that take the subjunctive as well as irregular verbs in the subjunctive. Some of the common trigger phrases include "a menos que" (unless), "antes de que" (before), "es importante que" (it's important that), and "hasta que" (until). The irregular verbs given as examples are dar (to give), estar (to be), haber (to have), ir (to go), saber (to know), and ser (to be).