In short

The verbs you need most - andare, fare, venire, dire, stare, dare, sapere - are the ones that break the rules. But they break them in a small number of shared ways, so learn them in families, not one by one. Almost all of them keep the regular noi and voi forms, so only four cells per verb are really new.

The rule

An irregular verb is irregular in its stem, almost never in its endings. Vado, faccio and vengo still end in -o like parlo; andiamo, facciamo and veniamo still end in -iamo. What changes is what sits in front of the ending. That is why these verbs look frightening and are actually cheap to learn.

• Step 1 - Assume the endings from Present tense: regular verbs. The six endings are the ones you already know. Do not invent new ones.
• Step 2 - Check noi and voi first. In most irregular verbs these two are built on the plain infinitive stem and are completely predictable: andare -> andiamo, andate; venire -> veniamo, venite. Get them for free and stop worrying about them.
• Step 3 - Learn the four odd cells. The irregularity is concentrated in io, tu, lui/lei and loro - the forms where the stress falls on the stem. Learners call this the boot or L-shape: the changed forms are the top three plus the bottom one.
• Step 4 - Sort the verb into a family. Almost every common irregular belongs to one of the three groups below.

Family 1 - the -go verbs

A group of verbs inserts a g in exactly two cells: io and loro. Everything else behaves: vengo, vieni, viene, veniamo, venite, vengono. The members you need at A1 are venire (vengo), tenere (tengo), rimanere (rimango) and salire (salgo). Later you will meet scegliere (scelgo), togliere (tolgo) and spegnere (spengo) - same trick.

The g is never in noi or voi. Venghiamo does not exist.

Family 2 - the short verbs: andare, fare, dare, stare, sapere

These five are the oldest and most worn-down verbs in the language, and they have rubbed against each other until they rhyme. Look at tu, lui/lei and loro across all five - the pattern is identical: -ai, a bare vowel, -anno.

fare also hides a longer Latin stem, fac-, which surfaces in faccio and facciamo. dire is not one of the five, but it works the same way: its stem dic- runs through almost every form (dico, dici, dice, diciamo, dicono). Both lose the long stem at voi, which is why voi is the shockingly short fate and dite - not facete, not dicete.

Family 3 - stem-changing verbs

Here the stem vowel changes, but only when it is stressed - so, again, in the boot and not at noi/voi:

• uscire: u becomes e -> esco, esci, esce, but usciamo, uscite, then escono.
• venire, tenere: e becomes ie at tu and lui/lei -> vieni, viene; tieni, tiene. (These verbs are in two families at once: -go at io/loro, ie in the middle.)
• morire: o becomes uo -> muoio, muori, muore, but moriamo, morite, then muoiono.

The logic is the same as the -isc- verbs you met in step 6: stressed stem -> something happens; unstressed stem (noi, voi) -> nothing happens. finire -> finisco but finiamo is not irregular at all - it is just that same rhythm rule, and those verbs stay fully regular.

Forms & patterns

The five high-frequency irregulars, side by side. Read the tu, lui/lei and loro rows across - they rhyme:

The -go family - the g appears at io and loro only:

dire and uscire - the hidden stem and the vowel switch:

Where the irregularity actually sits - the shape of the job, for any irregular verb:

Examples

Common mistakes

• noi venghiamo -> noi veniamo - the g of vengo lives in io and loro only. noi and voi are built on the plain infinitive: veniamo, venite.
• voi dicete / voi facete -> voi dite / voi fate - the two shortest voi forms in the language. There is no way around them: memorise the pair together.
• noi esciamo -> noi usciamo - the vowel only changes when it is stressed. noi and voi keep the u of the infinitive.
• lui da un regalo -> lui dà un regalo - without the accent, da is the preposition “from”. The verb takes a grave accent: dà.
• tu vengi -> tu vieni - tu is not built from the io form. vengo and vieni are different stems, and only loro copies io.

Tips

• Five verbs, one rhyme. vai - fai - dai - stai - sai, then vanno - fanno - danno - stanno - sanno. Say the two chains out loud until they are one word each; that is 10 of the hardest forms in Italian, done.
• The g is a bookend. In every -go verb the g shows up at the top (io) and the bottom (loro) and nowhere in between. If a g appears at noi, it is wrong.
• noi is your safety net. Stuck on a form? The noi form is nearly always regular, and it hands you the true stem: andiamo -> the verb is really and-; diciamo -> the verb is really dic-.
• sapere means to know a fact or to know how to do something (So nuotare - I can swim). Knowing a person or a place is conoscere, which is perfectly regular.