Final answer:
In the verb tener, the only form that is not regular is nosotros.
Step-by-step explanation:
In the verb tener, the only form that is not regular is nosotros. In Spanish, regular verbs follow a predictable pattern in their conjugation, but irregular verbs, like tener, do not. The conjugation of nosotros in the present tense of tener is tenemos, while the conjugation for tu and usted is tienes.
Learn more about Irregular conjugation in Spanish verbs