This document discusses how to form affirmative and negative commands using Ud. and Uds. forms. It explains that the yo form of the verb is used as the stem, and then -e or -en is added for -ar verbs. It also notes that the same spelling changes and irregular forms apply as for negative tu commands. Pronouns are attached to affirmative commands and placed before the verb for negative commands. Examples of commands for -er and -ir verbs are provided by adding -a or -an. The document concludes by listing examples of negative commands for several common verbs using tu, Ud., and Uds. forms.