Verb Stacking: The Two-Step Flowchart (Zero, A, or Di)
“I want to leave”, “I decided to go”, “I started to understand” — when two verbs meet, a quick two-step check tells you whether to use che, a, di, or nothing at all.
Step 1 — check the subjects
Before anything else, ask: is the same person doing both actions?
Different subjects? With verbs like volere, pensare and sperare, break the sentence open. Conjugate the first verb, add che, and conjugate the second verb — usually in the subjunctive when it expresses a wish, doubt or opinion.
Same subject? Take the shortcut. Don't conjugate the second verb; keep it as an infinitive and move on to Step 2.
- Voglio che tu parta.I want you to leave. (I want, you leave — two subjects)
- Voglio partire.I want to leave. (I want, I leave — same subject)
- Penso che loro siano a casa.I think they're at home.
- Penso di essere in ritardo.I think I'm late.
Step 2 — pick your bridge (same subject only)
The first verb decides how it glues onto the infinitive. The three most common options are nothing, a, or di (a few verbs use others, like stare per partire).
| Bridge | Used after | Example |
|---|---|---|
| zero | modals (volere, potere, dovere, sapere), è + adjective, bisogna, preferire | voglio mangiare · è facile svegliarsi |
| a | movement, starting/continuing, learning, succeeding | vado a dormire · inizio a capire |
| di | thinking, deciding, trying, stopping, feelings | decido di partire · smetto di fumare |
Zero — modals and “it's + adjective”
Modal verbs and impersonal expressions like è facile and bisogna take the infinitive directly, just like English “I can swim”. Sensory and causative verbs (vedere, sentire, fare, lasciare) do too.
- Devo studiare stasera.I have to study tonight.
- So nuotare.I know how to swim.
- È facile svegliarsi presto d'estate.It's easy to wake up early in summer.
- Bisogna prenotare.You need to book.
- Ti sento cantare.I hear you singing.
a — movement, launching and learning
Use a when the first verb moves you toward the action, starts or continues it, teaches it, or succeeds at it.
- Andiamo a mangiare.Let's go eat.
- Vengo a trovarti domani.I'll come see you tomorrow.
- Ho iniziato a capire.I've started to understand.
- Continua a piovere.It keeps raining.
- Sto imparando a guidare.I'm learning to drive.
- Non riesco a dormire.I can't (manage to) sleep.
di — thoughts, decisions and finishing
Most verbs of thinking, hoping, remembering, deciding and trying take di, as do verbs of stopping, and avere/essere + noun or adjective of feeling. There are exceptions (provare a, pensare a), so learn the common ones.
- Ho deciso di partire.I decided to leave.
- Cerco di capire.I'm trying to understand.
- Spero di vederti presto.I hope to see you soon.
- Ricordati di chiamare la nonna.Remember to call grandma.
- Ho smesso di fumare.I stopped smoking.
- Ho voglia di uscire.I feel like going out.
- Sono felice di essere qui.I'm happy to be here.
The big opposites: iniziare a vs finire di
Starting pushes you toward the action, so it takes a. Stopping pulls you away from it, so it takes di. Learn them as pairs.
| Start / keep going (a) | Stop / finish (di) |
|---|---|
| iniziare a / cominciare a | finire di |
| continuare a | smettere di |
| mettersi a | terminare di |
Trap: “easy to read” with da
When “easy/hard/good to + verb” describes a noun, Italian switches to da — the same purpose bridge as acqua da bere (water to drink).
- È facile leggere questo libro.It's easy to read this book. (zero — general statement)
- Questo libro è facile da leggere.This book is easy to read. (da — describes the book)
- Ho tanto lavoro da fare.I have a lot of work to do.
Common mistakes
Different subjects — open the sentence with che and use the subjunctive.
Modal verbs take the infinitive directly.
Decisions take di.
Starting takes a; stopping takes di.
When the adjective describes the noun, add da.
Test yourself
0 / 4 answered1. Domani devo ___ presto.
2. Finalmente ho iniziato ___ il congiuntivo!
3. Abbiamo deciso ___ in Sicilia.
4. Mia madre vuole che io ___ medico.