Coniugazione di dovere - WordReference.com
www.wordreference.com › conj › ITverbsdovere. 'dovere' is the model of its conjugation. When this verb stands alone, it takes avere in compound tenses. When it serves as a semi-modal helping verb, compound tenses are formed using the auxiliary of the main verb that follows. However, if semi-modal dovere introduces essere as the main verb, the compound tense auxiliary is avere.