Final answer:
The verb HABER does not have a stem change in the conditional tense. It retains its original form 'habría' for all the persons, only varying the ending to match the subject of the sentence.
Step-by-step explanation:
The verb HABER does not undergo a stem change in the conditional conjugation. In Spanish, the conditional tense, also known as the conditional mood, is formed by taking the infinitive of the verb and adding the conditional endings. For HABER, this would result in the following conditional conjugations: yo habría, tú habrías, él/ella/usted habría, nosotros/nosotras habríamos, vosotros/vosotras habríais, ellos/ellas/ustedes habrían.
Stem changes are typically present in the present tense for certain verbs that fall under the categories of -ar, -er, and -ir with irregularities, such as 'poder' changing to 'puedo' in the present tense. However, these stem changes do not apply to the conditional tense. Therefore, for the verb HABER, no stem change is needed when conjugating it in the conditional.