The -ISC Verbs in Italian
Some Italian -ire verbs (third-conjugation verbs) follow a special pattern in the present tense called the “-ISC” conjugation. These verbs—such as finire, capire, and pulire—insert -isc- into the stem in four forms:
- io
- tu
- lui/lei
- loro
The noi and voi forms remain completely regular.
The good news? This subgroup is small, consistent, and easy to recognize. Once you learn the pattern, you’ll start noticing -isc verbs everywhere.
The Three Verb Groups in Italian
Before we dive into “-isc” verbs, here’s a quick reminder of the three main Italian verb families:
1st Conjugation – ARE verbs
cucinare (to cook), mangiare, studiare, guardare
2nd Conjugation – ERE verbs
scrivere (to write), leggere, vedere, vincere
3rd Conjugation – IRE verbs
dormire (to sleep), aprire, partire, finire
Most -ire verbs follow a regular pattern. A smaller group uses the -isc pattern.
| Person | Conjugation | English |
|---|---|---|
| io | dormo | I sleep |
| tu | dormi | you sleep |
| lui/lei | dorme | he/she sleeps |
| noi | dormiamo | we sleep |
| voi | dormite | you sleep |
| loro | dormono | they sleep |
This is the regular third-conjugation pattern.
Irregular -ISC Conjugation
Now compare it to capire:
| Person | Conjugation | English |
|---|---|---|
| io | capisco | I understand |
| tu | capisci | you understand |
| lui/lei | capisce | he/she understands |
| noi | capiamo | we understand |
| voi | capite | you understand |
| loro | capiscono | they understand |
Pronunciation Rule for -ISC Verbs
| Form | Example | Pronunciation |
|---|---|---|
| io | capisco | “sk” as in skateboard |
| tu | capisci | “sh” as in shoot |
| lui/lei | capisce | “sh” as in shoot |
| noi | capiamo | “k” |
| voi | capite | “k” |
| loro | capiscono | “sk” as in skateboard |
➡️ -isc + i/e → “sh”
➡️ -isc + o/a → “sk”
This is why capisci sounds like “ca-pee-shee,” while capisco sounds like “ca-pee-sko.”
Most Common -ISC Verbs in Italian
Below is a list of the most frequently used “-isc” verbs. These appear constantly in everyday conversation.
Preferire — to prefer
preferisco, preferisci, preferisce, preferiamo, preferite, preferiscono
Finire — to finish
finisco, finisci, finisce, finiamo, finite, finiscono
Pulire — to clean
pulisco, pulisci, pulisce, puliamo, pulite, puliscono
Spedire — to ship/send
spedisco, spedisci, spedisce, spediamo, spedite, spediscono
Costruire — to build
costruisco, costruisci, costruisce, costruiamo, costruite, costruiscono
Chiarire — to make clear
chiarisco, chiarisci, chiarisce, chiariamo, chiarite, chiariscono
Digerire — to digest
digerisco, digerisci, digerisce, digeriamo, digerite, digeriscono
Contribuire — to contribute
contribuisco, contribuisci, contribuisce, contribuiamo, contribuite, contribuiscono
Fiorire — to bloom
fiorisco, fiorisci, fiorisce, fioriamo, fiorite, fioriscono
Guarire — to heal/recover
guarisco, guarisci, guarisce, guariamo, guarite, guariscono
Inserire — to insert
inserisco, inserisci, inserisce, inseriamo, inserite, inseriscono
Reagire — to react
reagisco, reagisci, reagisce, reagiamo, reagite, reagiscono
Restituire — to return (something)
restituisco, restituisci, restituisce, restituiamo, restituite, restituiscono
Unire — to unite/join
unisco, unisci, unisce, uniamo, unite, uniscono
How to Know if an -IRE Verb Uses -ISC (aka the 5th-letter trick)
Here’s the golden question:
Is there a rule?
Unfortunately, there’s no absolute rule, but there is a strong pattern:
Trend:
If the fifth-to-last letter in the infinitive is a vowel, the verb usually takes -isc.
Examples:
- finire → finisco
- pulire → pulisco
- spedire → spedisco
- proibire → proibisco
If it’s a consonant, it usually stays regular:
- aprire → apro (regular)
- dormire → dormo (regular)
- offrire → offro (regular)
- seguire → seguo (regular)
Is this rule perfect?
No. But it works most of the time and is a helpful shortcut for learners.
Important:
The -ISC pattern appears only in the present forms (presente, imperative, and present subjunctive).
It does not affect the other tenses:
- Imperfetto → finivo, finivi… (no -isc)
- Passato prossimo → ho finito (no -isc)
- Futuro → finirò (no -isc)
- Condizionale → finirei (no -isc)
In all non-present tenses, -isc verbs behave just like regular -ire verbs.
Conclusion
The“-ISC” verbs might look intimidating at first, but they follow a very predictable pattern:
- Add -isc- in four present-tense forms
- Remember the pronunciation shift between “sk” and “sh”
- Use the 5th-letter trick explained above as a quick guide
Master a handful of the most common -isc verbs, and you’ll suddenly start hearing and recognizing them everywhere!
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