OriginInherited from Early Medieval Latin essere, from Latin esse.
From Latin sum. The conjugation is suppletive; the present subjunctive stems are from Latin sedēre (“sit”), and the past participle stât is from Latin stātus.
Formsjessi(infinitive) · sint(gerund) · stât(masculine, participle, past, singular) · stâts(masculine, participle, past, plural) · stâde(feminine, participle, past, singular) · stâdis(feminine, participle, past, plural) · o soi(first-person, indicative, present, singular) · tu sês(indicative, present, second-person, singular) · al(indicative, present, singular, third-person) · e è(indicative, present, singular, third-person) · jè(indicative, present, singular, third-person) · o sin(first-person, indicative, plural, present) · o sês(indicative, plural, present, second-person) · a ses(indicative, plural, present, third-person) · o jeri(first-person, imperfect, indicative, singular) · tu jeris(imperfect, indicative, second-person, singular) · al(imperfect, indicative, singular, third-person) · e jere(imperfect, indicative, singular, third-person) · o jerin(first-person, imperfect, indicative, plural) · o jeris(imperfect, indicative, plural, second-person)
Source: Wiktionary