Purpose infinitive (per + infinitive) — "in order to" / "to"

Purpose infinitive (per + infinitive) in Italian

What does "per + infinitive" mean?

"Per + infinitive" is the usual way in Italian to express purpose — the reason why someone does something. It corresponds to English "to" or "in order to." Use it when you want to say the goal or intention of an action.

Examples:
- Studio per imparare l'italiano. — I study to learn Italian. ("in order to learn")
- Sono venuto per parlarti. — I came to talk to you.

When do I use "per + infinitive"?

Main rule: use "per + infinitive" when the subject of the main verb and the (understood) subject of the infinitive are the same.

- If the same person does both actions: use per + infinitive.
- Esco per comprare il pane. — I go out to buy bread. (I go out and I buy.)

- If the subjects are different, you cannot normally use "per + infinitive" by itself. Use alternatives (see below).
- Wrong: Ho lasciato la finestra aperta per il gatto entrare.
- Correct: Ho lasciato la finestra aperta per far entrare il gatto. / Ho lasciato la finestra aperta perché il gatto potesse entrare.

Also useful notes:
- You can use "per + infinitive" in spoken and written Italian. It is common and natural.
- To express negative purpose, use "per non + infinitive" (see examples).

How do I form "per + infinitive"?

Simple formation:
- per + infinitive (infinito presente): per + (parlare, mangiare, dormire, partire)
- Per studiare bisogna organizzarsi. — To study you need to organize yourself.

Negative:
- per non + infinitive
- Ho spento la radio per non svegliare i bambini. — I turned off the radio so as not to wake the children.

Pronouns with the infinitive:
- Object and reflexive pronouns attach to the infinitive (enclitic forms).
- Sono venuto per aiutarti. — I came to help you.
- Mi sono fermato per riposarmi. — I stopped to rest.
- Grazie per avermelo detto. — Thanks for having told me (lit. "for having told it to me").

Past infinitive (infinito passato):
- per + avere/essere + past participle appears in Italian, but it often expresses cause/reason ("for having done X") rather than purpose.
- Per aver mentito, è stato punito. — He was punished for having lied.
Note: "per + infinito passato" is frequently causal. If you intend "in order to have done X" (a more complex idea), Italian usually expresses that differently.

Examples: many natural examples to show different uses

Same subject (purpose) — per + infinitive
- Studio per superare l'esame. — I study to pass the exam.
- Lavoro per mantenere la mia famiglia. — I work to support my family.
- Sono andato in biblioteca per cercare informazioni. — I went to the library to look for information.
- Restiamo qui per aspettare l'autobus. — We stay here to wait for the bus.

Negative purpose — per non + infinitive
- Ha parlato piano per non svegliare il bambino. — He spoke quietly so as not to wake the baby.
- Ho chiuso la finestra per non far entrare il freddo. — I closed the window so as not to let the cold in.

Pronouns and reflexive verbs (pronoun attaches to the infinitive)
- Vengo per aiutarti. — I'm coming to help you.
- Ti ho chiamato per dirtelo di persona. — I called you to tell you in person.
- Mi sono fermato per lavarmi le mani. — I stopped to wash my hands.
- Grazie per avermelo detto. — Thanks for having told me it.

Different subject — use per far + infinitive or affinché / perché + subjunctive
- Ho lasciato la finestra aperta per far entrare il gatto. — I left the window open to let the cat in. ("far" = causative verb: makes the structure grammatical when the subject of the action is different)
- Ho lasciato la finestra aperta perché il gatto potesse entrare. — I left the window open so that the cat could enter. ("perché" + subjunctive or "affinché" + subjunctive are alternatives)

Movement verbs: "per" vs "a" with infinitive
Both are possible in many contexts; nuance and register differ.
- Vado al mercato per comprare frutta. — I go to the market to buy fruit.
- Vado al mercato a comprare frutta. — I go to the market (to) buy fruit. (very common in spoken Italian)
Note: "andare a + infinitive" is extremely common with movement verbs and is often the natural spoken alternative. "Per" is slightly more explicit about purpose and is fully correct.

Per + past infinitive (usually expresses cause/reason)
- Per aver parlato così, è stato rimproverato. — For having spoken like that, he was reprimanded.
- Per essere arrivato in ritardo, ha perso l'inizio della riunione. — Because he arrived late, he missed the start of the meeting.
(These examples show a causal meaning: "because of having done X".)

Common mistakes and how to avoid them

1) Using "per + infinitive" when the subjects are different
- Wrong: Ho lasciato la finestra aperta per il gatto entrare.
- Why wrong: the infinitive "entrare" has the cat as subject, while "ho lasciato" has "I" as subject.
- Correct options:
- Ho lasciato la finestra aperta per far entrare il gatto. (use the causative "far" + infinitive)
- Ho lasciato la finestra aperta perché/affinché il gatto potesse entrare. (use conjunction + subjunctive)

2) Confusing "per" with "a" after motion verbs
- Both can work, but register and nuance change.
- Vado a comprare il pane. (very natural, spoken)
- Vado al mercato per comprare il pane. (clear purpose; fully correct)
Tip: If in doubt, "per + infinitive" is a safe, explicit way to show purpose.

3) Incorrect pronoun placement
- Wrong: *Per lo vedere.
- Correct: Per vederlo. / Per averlo visto.
Always attach object pronouns to the infinitive (vederlo, aiutarci, dirtelo).

4) Using "per + passato prossimo" expecting a purpose meaning
- Remember: "per + infinito passato" usually indicates cause (for having done...), not "in order to have done..." If you need to express a goal that refers to completing something beforehand, rephrase.

Alternatives and when to use them

- affinché + subjunctive (formal) — Use when subjects differ and you want a clear purpose clause.
- Ti chiamo affinché tu sappia la verità. — I call you so that you may know the truth.

- perché + subjunctive/indicative — Can express cause or purpose. Use subjunctive if the clause expresses purpose and the subject is different.
- L'ho fatto perché tu potessi partire tranquillo. — I did it so that you could leave peacefully.
- L'ho fatto perché ero stanco. — I did it because I was tired. (here it's cause, indicative)

- per far + infinitive — Use when the action you cause is done by someone/something else (different subject).
- Ho chiamato per far venire un medico. — I called to have a doctor come.

- a + infinitive — Especially after verbs of motion (andare, venire, entrare) as a spoken alternative.
- Andiamo a vedere il film. (We are going to see the movie.)

Quick reference — short rules and patterns

- Pattern: per + infinitive = "to / in order to" (purpose), when the subject is the same.
- Per + infinitive: Studio per imparare.
- Per non + infinitive: Ho chiuso la porta per non far entrare il vento.
- Per + avere/essere + past participle: usually causal ("for having ...").
- If subjects differ: use per far + infinitive or affinché/perché + subjunctive.
- Pronouns attach to the infinitive: per vederlo, per aiutarci, per dirtelo.

Glossary

- Infinitive (infinito): the base form of the verb (parlare, dormire, scrivere).
- Subjunctive (congiuntivo): a mood used in dependent clauses after certain conjunctions/verbs (used for wishes, doubts, purpose clauses when subjects differ).
- Subject: the person or thing performing the action.
- Causative "far": a verb used to say "to make/let someone do something" (ex: far entrare = to let/make enter).
- Infinito passato (past infinitive): avere/essere + past participle, often used with "per" to mean "for having done..." (cause).

If you want, I can give a shorter cheat-sheet for quick study or a focused list of common verbs that often take "per + infinitive."