eo

Eo, ire, ii or ivi, itum. Irregular, tiny, and everywhere, so learn it whole: eo, is, it, imus, itis, eunt. The imperfect is ibam and the future ibo, ibis, ibit - which looks exactly like a first conjugation future and is the single commonest misreading of this verb. The perfect is usually the contracted ii, giving isti and isse, though the corpus also shows iuit.

The compounds are legion and mostly regular: abeo, adeo, exeo, redeo, transeo, pereo, ineo, subeo, intereo. Being intransitive, eo has no personal passive, but the impersonal itur, "there is a going", and the future passive infinitive iri turn up constantly - iri is what makes the future passive infinitive of every other verb, as in captum iri. English inherits exit, transit, ambition, initial, perish and issue.