The -si pattern is the single most powerful rule in the Italian passato remoto. Master it once and you have just conjugated prendere, scrivere, leggere, mettere, chiedere, chiudere, decidere, ridere, rispondere, correre — and roughly fifty other -ere verbs that show up constantly in spoken and written Italian. Almost every irregular -ere verb in the language belongs to this family.
Despite the name "irregular," the pattern itself is highly regular: there is a single template, and you simply learn which stem each verb takes. The rhythm of the conjugation — three irregular slots, three regular slots — is the same in every verb.
The 1-3-6 rhythm
Like avere (ebbi, avesti, ebbe), every -si verb splits its conjugation into two halves. The io, lui, and loro forms (positions 1, 3, 6 in the standard listing) take an irregular stem and the special endings -si, -se, -sero. The tu, noi, and voi forms (positions 2, 4, 5) take the regular stem and the regular -ere endings -esti, -emmo, -este.
| Person | Stem | Ending |
|---|---|---|
| io | irregular (modified) | -si |
| tu | regular (from infinitive) | -esti |
| lui / lei / Lei | irregular (modified) | -se |
| noi | regular (from infinitive) | -emmo |
| voi | regular (from infinitive) | -este |
| loro | irregular (modified) | -sero |
Prendere — the model verb
Prendere (to take) is the canonical example. Its irregular stem is pres- (the original -nd- of the infinitive collapses, and the stem-final consonant fuses with the -s of the ending into a single -s-). Its regular stem is prend-, the same stem you use in the present and the imperfetto.
| Person | Conjugation | Stem used |
|---|---|---|
| io | presi | pres- (irregular) |
| tu | prendesti | prend- (regular) |
| lui / lei / Lei | prese | pres- (irregular) |
| noi | prendemmo | prend- (regular) |
| voi | prendeste | prend- (regular) |
| loro | presero | pres- (irregular) |
Presi il primo treno per Roma e arrivai prima di mezzogiorno.
I took the first train to Rome and arrived before noon.
Lui prese il libro dallo scaffale, lo aprì e cominciò a leggere.
He took the book from the shelf, opened it, and started reading.
Prendemmo una decisione difficile, ma non avevamo scelta.
We made a hard decision, but we had no choice.
I ragazzi presero la bicicletta e sparirono per tutto il pomeriggio.
The kids took their bikes and disappeared for the whole afternoon.
The major verbs in the -si family
Below is the working list. Notice how the irregular stem is always a modified version of the infinitive stem — usually the final consonant of the stem fuses with -s-, sometimes with a vowel change as well.
| Infinitive | Meaning | io (irregular) | tu (regular) | lui (irregular) |
|---|---|---|---|---|
| prendere | to take | presi | prendesti | prese |
| scrivere | to write | scrissi | scrivesti | scrisse |
| leggere | to read | lessi | leggesti | lesse |
| mettere | to put | misi | mettesti | mise |
| chiedere | to ask | chiesi | chiedesti | chiese |
| chiudere | to close | chiusi | chiudesti | chiuse |
| decidere | to decide | decisi | decidesti | decise |
| ridere | to laugh | risi | ridesti | rise |
| rispondere | to answer | risposi | rispondesti | rispose |
| correre | to run | corsi | corresti | corse |
| vedere | to see | vidi | vedesti | vide |
| perdere | to lose | persi | perdesti | perse |
| nascere | to be born | nacqui | nascesti | nacque |
| vivere | to live | vissi | vivesti | visse |
| spegnere | to turn off | spensi | spegnesti | spense |
Note the special cases at the bottom. Vedere has a vowel change (vidi, not visi). *Nascere breaks the pattern more forcefully with nacqui — its irregular stem comes from Latin natus sum. Spegnere drops the -gn- in the irregular stem and replaces it with -ns-. These oddities are worth memorizing as set forms.
A look at "misi" — not "messi"
A particularly tricky case is mettere. The io form is misi, with the vowel i — not *messi as you might expect from "metto / metti / mette." This is one of the few -si verbs where the vowel of the irregular stem differs from the vowel of the regular stem.
| Person | presente | passato remoto |
|---|---|---|
| io | metto | misi |
| tu | metti | mettesti |
| lui / lei | mette | mise |
| noi | mettiamo | mettemmo |
| voi | mettete | metteste |
| loro | mettono | misero |
Misi la chiave nella tasca destra e non la trovai più.
I put the key in my right pocket and never found it again.
Lei mise un disco sul giradischi e la stanza si riempì di musica.
She put a record on the turntable and the room filled with music.
The same vowel shift happens in vedere → vidi and vivere → vissi — the irregular stem takes i, the regular stem keeps e. There is no way to predict which verbs will do this; you memorize them as you encounter them.
Real -si verbs in real contexts
Below are sentences in the kind of register where you would actually meet these forms — historical narrative, biography, reportage, literary fiction. This is where the passato remoto lives.
Dante scrisse la Divina Commedia nei suoi anni d'esilio.
Dante wrote the Divine Comedy during his years in exile.
Lessi il romanzo in tre giorni, senza riuscire a fermarmi.
I read the novel in three days, unable to stop.
Mi chiese cosa pensavo di lui, ma non seppi rispondere.
He asked me what I thought of him, but I didn't know how to answer.
Chiusi gli occhi e contai fino a dieci.
I closed my eyes and counted to ten.
Decidemmo all'unanimità di non firmare il contratto.
We decided unanimously not to sign the contract.
Risero tutti tranne il professore.
Everyone laughed except the professor.
Il senatore non rispose alle accuse.
The senator did not respond to the accusations.
Corremmo fino alla stazione, ma il treno era già partito.
We ran to the station, but the train had already left.
Lo vidi per l'ultima volta in un bar di Trastevere.
I saw him for the last time in a bar in Trastevere.
Persi il portafoglio sul tram della linea 14.
I lost my wallet on the line-14 tram.
The pattern unifies dozens of compound verbs
Every prefix-bearing relative of these verbs follows the same pattern. If you know prendere → presi, then you also know:
| Compound | io form | Meaning |
|---|---|---|
| riprendere | ripresi | I took back / resumed |
| comprendere | compresi | I understood |
| sorprendere | sorpresi | I surprised |
| apprendere | appresi | I learned |
| intraprendere | intrapresi | I undertook |
The same applies to descrivere (descrissi), iscrivere (iscrissi), trascrivere (trascrissi) — all built on the scrivere → scrissi pattern. Italian's prefix-stripping consistency means one base verb teaches you a whole derivational family.
Comprese subito il senso delle mie parole.
He understood the meaning of my words at once.
Trascrissero la conversazione parola per parola.
They transcribed the conversation word for word.
When the -si form would clash with the stem
A few -ere verbs that look like they should join this family don't, because the resulting -si form would be phonologically awkward. Credere, vendere, temere, ricevere all stay regular: cresi, vensi, temsi, ricesi would be unpronounceable Italian. So those verbs default to the -ei / -etti pattern.
Likewise, rompere is irregular but not in this family — it goes the double-consonant route (ruppi, ruppe, ruppero) because the -mp- cluster wants doubling rather than -si fusion.
Common mistakes
❌ Io prendetti il treno.
Incorrect — prendere is irregular. The io form is presi, not the would-be-regular *prendetti.
✅ Io presi il treno.
Correct — presi follows the -si pattern.
❌ Lui scriveva il libro in due mesi.
Incorrect tense — describes a single completed event in the past, requires passato remoto, not imperfetto.
✅ Lui scrisse il libro in due mesi.
Correct — completed action with explicit duration.
❌ Loro chiudettero la porta.
Incorrect — chiudere is irregular. The loro form is chiusero, not the would-be-regular *chiudettero.
✅ Loro chiusero la porta.
Correct — chiusero, third-person plural of chiudere following the -si pattern.
❌ Io messi la chiave sul tavolo.
Incorrect — the io form of mettere is misi, with i, not *messi.
✅ Io misi la chiave sul tavolo.
Correct — misi.
❌ Tu presi il libro.
Incorrect — tu uses the regular stem prend-, not the irregular pres-. The form is prendesti.
✅ Tu prendesti il libro.
Correct — irregular stem appears only in io, lui, loro.
❌ Loro lessoro il giornale.
Incorrect — the loro ending is -sero, not *-soro. The form is lessero.
✅ Loro lessero il giornale.
Correct — lessero, with double s and -ero ending.
❌ Noi presimmo la decisione.
Incorrect — noi uses the regular stem and ending: prendemmo, not *presimmo.
✅ Noi prendemmo la decisione.
Correct — regular noi form despite the surrounding irregularity.
Key takeaways
The -si pattern is your single biggest leverage in mastering the irregular passato remoto. Three points to keep:
The 1-3-6 rhythm: io, lui, loro use the irregular stem with -si, -se, -sero. Tu, noi, voi use the regular stem with the regular -ere endings (-esti, -emmo, -este).
The endings are constant: -si, -se, -sero never change. What you memorize per verb is just the modified stem — pres-, scriss-, less-, mis-, chies-, chius-.
Compounds inherit the pattern: comprendere, sorprendere, descrivere, trascrivere, all behave like their base verbs. Learn the simple verbs and the rest fall into place.
The -si family covers the majority of irregular -ere verbs. The remaining minority — avere, bere, cadere, sapere, volere, tenere, venire, stare, dare, rompere — follow the double-consonant pattern, which uses the same 1-3-6 rhythm with a different ending strategy. Together, these two patterns plus essere account for nearly every irregular passato remoto in modern Italian.
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Open the Italian course →Related Topics
- 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: Double-Consonant Stems (bere, cadere, avere)B1 — The second great irregular family of the passato remoto — verbs whose io, lui, and loro forms double their stem-final consonant: ebbi, bevvi, caddi, seppi, volli, venni, stetti.
- 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: 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 -ire VerbsB1 — How to conjugate regular -ire verbs in the passato remoto — including the double-i orthographic curiosity and why -isco verbs drop their infix here.
- 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.