Italian has a dozen verbs with an irregular infinitive that ends in -arre, a contraction of the original infinitive ending -aggere. Many conjugations for these verbs are based on that original infinitive.
Italian has about 20 verbs with an irregular infinitive that ends in -orre, a contraction of the original infinitive ending -onere. Many conjugations for these verbs are based on that original infinitive.
Italian has a few verbs with an irregular infinitive that ends in -urre, a contraction of the original infinitive ending -ucere. Many conjugations for these verbs are based on that original infinitive.
Auxiliary verbs are also known as helping verbs, because they help form compound conjugations. The key thing to remember about Italian compound conjugations is that it’s the auxiliary verb which conjugates for the required tense or mood; the main verb is always a past participle.
Italian future conjugations are relatively simple. Most regular verbs and many irregular verbs use their infinitive minus -e as the future stem, and there is a single set of future endings for all verbs.
The Italian imperative exists for 5 different grammatical people, though only 3 are commonly used. It’s conjugated by taking the infinitive of the verb, dropping the infinitive ending, and adding a new set of endings.
Italian has only 4 irregular –are verbs. Though they don’t share a conjugation pattern, it’s helpful to look at them side by side because there are many similarities.