The terza coniugazione — the -ire class — is by far the kindest of the three to a learner facing the passato remoto. Unlike -ere verbs (most of which go irregular) or -are verbs (which have one orthographic quirk), regular -ire verbs follow a single clean paradigm with no alternative endings, no acute-vs-grave choice, and a transparent set of relationships with the present and imperfetto.
The catch is purely orthographic: the io form is written with two i's in a row, and the lui form takes a grave accent (ì), not an acute one. Get those two details right and you have the entire paradigm.
Dormire — the model verb
Take dormire (to sleep), drop the -ire to get the stem dorm-, and add the six endings.
| Person | Ending | Conjugation |
|---|---|---|
| io | -ii | dormii |
| tu | -isti | dormisti |
| lui / lei / Lei | -ì | dormì |
| noi | -immo | dormimmo |
| voi | -iste | dormiste |
| loro | -irono | dormirono |
Quella notte dormii male, agitato dai pensieri sul giorno dopo.
That night I slept badly, troubled by thoughts about the next day.
Dopo il viaggio dormimmo dodici ore di fila.
After the trip we slept twelve hours straight.
Il bambino dormì tutta la notte senza svegliarsi nemmeno una volta.
The child slept the whole night without waking even once.
I soldati dormirono all'aperto sotto le stelle.
The soldiers slept in the open under the stars.
The double i in the io form
This is the most distinctive orthographic feature of the regular -ire passato remoto. Because the stem ends in a consonant (dorm-) and the ending begins with i (-ii), Italian writes the result with two i's: dormii. Both i's are pronounced — there is a real phonetic length to the vowel.
Compare:
| Tense | Form | Pronunciation |
|---|---|---|
| presente (io) | dormo | /ˈdor.mo/ |
| imperfetto (io) | dormivo | /dor.ˈmi.vo/ |
| passato remoto (io) | dormii | /dor.ˈmi.i/ |
The two-syllable pronunciation of dormii is what justifies the double i in writing. If you say it aloud you hear two distinct beats: dor-MI-i.
The grave accent on the lui form
The lui form is dormì with a grave accent (ì). This is different from the acute é that appears on the lui form of regular -ere verbs (credé). The two accents look similar but carry distinct phonological information:
- Acute (´) marks closed vowels: é (closed e), ó (closed o)
- Grave (`) marks open vowels and stressed final i/u/a: à, è, ì, ò, ù
Italian i and u are always written with the grave when stressed at the end of a word. So dormì, sentì, capì, partì all take ì.
Lei sentì un rumore al piano di sotto e si alzò di scatto.
She heard a noise downstairs and jumped up.
Capì subito che stavo mentendo.
He understood immediately that I was lying.
Il professore finì la lezione con una citazione di Dante.
The professor finished the lesson with a quote from Dante.
Marco partì all'alba senza salutare nessuno.
Marco left at dawn without saying goodbye to anyone.
The double m in noi
As in every passato remoto, the noi form has a double m: dormimmo. This is the same etymological doubling you see in fummo, avemmo, andammo, credemmo, sentimmo.
Crucially, this is what distinguishes the passato remoto from the imperfetto in the noi person:
| Tense | Form | Translation |
|---|---|---|
| imperfetto | dormivamo | we slept / we were sleeping (ongoing) |
| passato remoto | dormimmo | we slept (one completed event) |
Da bambini dormivamo sempre dai nonni il sabato sera.
As children we always slept at our grandparents' on Saturday nights. (habitual, imperfetto)
Quella notte d'estate dormimmo in giardino, sotto un lenzuolo.
That summer night we slept in the garden, under a sheet. (single occasion, passato remoto)
High-frequency regular -ire verbs
Almost every -ire verb is regular in the passato remoto. Here are the ones you will encounter most often:
| Infinitive | Meaning | io form | lui form | noi form |
|---|---|---|---|---|
| partire | to leave | partii | partì | partimmo |
| sentire | to hear / feel | sentii | sentì | sentimmo |
| capire | to understand | capii | capì | capimmo |
| finire | to finish | finii | finì | finimmo |
| servire | to serve | servii | servì | servimmo |
| dormire | to sleep | dormii | dormì | dormimmo |
| aprire | to open | aprii | aprì | aprimmo |
| seguire | to follow | seguii | seguì | seguimmo |
| preferire | to prefer | preferii | preferì | preferimmo |
Note that aprire is regular in the passato remoto (aprii), even though its past participle (aperto) is irregular. The two systems are independent.
Sentii i suoi passi nel corridoio prima ancora di vederlo.
I heard his footsteps in the corridor before I even saw him.
Aprimmo la porta con cautela, senza sapere cosa avremmo trovato dentro.
We opened the door carefully, not knowing what we would find inside.
Lo seguirono fino alla stazione, poi lo persero di vista.
They followed him to the station, then lost sight of him.
The -isco subgroup: drop the infix
Italian has a productive class of -ire verbs that insert -isc- between the stem and the ending in three of the six present-tense persons (io, tu, lui, loro). Verbs in this class include capire, finire, preferire, pulire, restituire, costruire, spedire, and many more.
In the passato remoto, the -isc- infix disappears. These verbs conjugate exactly like dormire — there is no capisco form anywhere in the paradigm.
| Person | capire (presente) | capire (passato remoto) |
|---|---|---|
| io | capisco | capii |
| tu | capisci | capisti |
| lui / lei / Lei | capisce | capì |
| noi | capiamo | capimmo |
| voi | capite | capiste |
| loro | capiscono | capirono |
The -isc- is a present-tense phenomenon only. It appears in the presente and the present subjunctive, and that is all. Imperfetto, futuro, condizionale, passato remoto — all built without it. So a learner who has internalized "capisco, capisci, capisce" must consciously drop that pattern when shifting to past tenses: capii, capì, capirono.
This is the same principle that governs the imperfetto (capivo, capiva, capivano) — the -isc- is just absent from any tense formed off the infinitive stem.
Capii subito che qualcosa non andava.
I understood at once that something was wrong.
Finimmo il progetto due settimane dopo la scadenza.
We finished the project two weeks after the deadline.
Preferirono restare in silenzio piuttosto che mentire.
They preferred to stay silent rather than lie.
L'architetto costruì la villa in soli otto mesi.
The architect built the villa in just eight months.
Common mistakes
❌ Io dormi otto ore.
Incorrect — without the second i, this is the tu form of the presente, not the io of the passato remoto.
✅ Io dormii otto ore.
Correct — double i marks the io passato remoto.
❌ Lui dormí tutta la notte.
Incorrect — wrong accent. The -ire passato remoto takes grave ì, not acute í.
✅ Lui dormì tutta la notte.
Correct — grave accent on the final i.
❌ Io capisci la lezione.
Incorrect — passato remoto of capire does not take the -isc- infix. And -isci would be the tu present anyway.
✅ Io capii la lezione.
Correct — capii, regular -ire passato remoto without -isc-.
❌ Noi sentimo un rumore.
Incorrect — the noi form has double m.
✅ Noi sentimmo un rumore.
Correct — sentimmo, like dormimmo, finimmo, capimmo.
❌ Loro finiscerono il lavoro.
Incorrect — -isc- does not appear in any past tense. The loro form is finirono, not *finiscerono.
✅ Loro finirono il lavoro.
Correct — finirono, regular -ire passato remoto.
❌ Lei aprí la finestra.
Incorrect — wrong accent direction. Italian uses grave on stressed final i.
✅ Lei aprì la finestra.
Correct — aprì with grave ì.
Key takeaways
The regular -ire passato remoto is the most predictable corner of the system:
Endings: -ii, -isti, -ì, -immo, -iste, -irono. Add them to the stem (infinitive minus -ire) and you're done.
Three orthographic facts: double i in io (dormii), grave ì in lui (dormì), double m in noi (dormimmo).
The -isc- infix vanishes. Capire, finire, preferire all become capii, finii, preferii — no trace of -isc- anywhere in the paradigm.
Almost every -ire verb you'll meet follows this pattern. The exceptions are the irregulars venire (venni — see double-consonant stems) and a small set of -ire verbs that take the -si pattern like morire (morii is the regular form, but compare with stronger irregulars). Once -ire is solid, you have two-thirds of the regular passato remoto in your pocket — only -ere remains, and that one is mostly a story about irregularities.
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Open the Italian course →Related Topics
- Passato Remoto: Regular -are VerbsB1 — The single most regular passato remoto class — the one place in this notoriously irregular tense where you can rely on a stable pattern, plus the obligatory accent, the double-m trap, and the stress placement that gives away non-natives.
- Passato Remoto: Regular -ere VerbsB1 — How to conjugate the small minority of -ere verbs that are actually regular in the passato remoto — and the two competing ending sets that both count as correct.
- Passato Remoto: Essere and AvereB1 — The two foundational verbs in the passato remoto — fui and ebbi — their wildly irregular forms, and why mastering them unlocks the trapassato remoto and centuries of Italian literature.
- Passato Remoto: The -si Pattern (Strong Perfects)B1 — The single most productive irregular pattern in the Italian passato remoto — one rule that conjugates dozens of high-frequency -ere verbs from prendere to scrivere to leggere.
- Il Passato Remoto: OverviewB1 — Italian's literary and Southern past tense — when it's productive, when it's archaic, why every Italian needs to recognize it even if half the country never says it, and a preview of the irregularity that makes it the hardest tense in the language.
- Presente: Regular -ire Verbs (Pure Subgroup)A1 — How to conjugate the 'pure' subgroup of -ire verbs in the present indicative — a small but high-frequency closed list of verbs that follow the basic -ire endings without the -isco infix.