Da + Infinitive: Purpose, Obligation, and Description

The construction "da + infinitive" is one of Italian's quiet workhorses — a tiny structure that does enormous semantic work and has no clean English equivalent. It marks what something is for (una tazza da tè — a teacup, meant for tea), what is left to be done (qualcosa da fare — something to be done), what is worth doing (un libro da leggere — a book worth reading), and what characterizes a person or thing (occhi da bambino — childlike eyes). Four functions, one preposition, one infinitive — and once you internalize the pattern, you will find yourself using it constantly.

The reason this construction trips up English speakers is that English distributes the same semantic work across several different structures: compounds (teacup, racehorse), infinitives of purpose (something to do), passive infinitives (work to be done), and adjectival modifiers (childlike eyes). Italian compresses all of these into a single pattern: noun + da + infinitive (or sometimes da + noun). Mastering this pattern is one of the cleanest tests of intermediate Italian.

1. The four uses at a glance

Before drilling each pattern, here is the master table.

The first three patterns share the structure noun + da + infinitive. The fourth uses da + noun with no infinitive. All four exploit the same preposition da in its function-marking role.

2. Use 1: Purpose / intended function

When da attaches a noun to an infinitive (or another noun), it marks what the first noun is for — its intended use, its function. This is the pattern behind almost every Italian compound noun for tools, equipment, and specialized objects.

Common examples

Why "da" and not "per"

This is the single most pernicious confusion. Per + infinitive also expresses purpose, but it attaches to a verb and describes the purpose of an action. Da + infinitive attaches to a noun and describes the function of a thing.

Saying "una macchina per scrivere" is not exactly wrong — it would be parsed as "a machine [used] in order to write," not as a fixed compound — but as a noun-phrase label for a typewriter, it sounds awkward and idiomatically off. The natural Italian compound is una macchina da scrivere.

3. Use 2: Obligation / left to be done

When da + infinitive attaches to a noun in an existential or possessive construction (esserci, avere), it expresses something that needs to be done, is left to do, or is to be Xed. This is the closest Italian comes to an English passive infinitive ("to be done").

Common patterns

• Avere + qualcosa + da + infinitive: "to have something to do"
• Esserci + qualcosa + da + infinitive: "there is something to do"
• Niente + da + infinitive: "nothing to do"
• Molto / poco + da + infinitive: "a lot / little to do"

Why this is "passive-like"

In English, a phrase like "a house to renovate" is structurally active (you're going to renovate the house) but semantically passive — the house is the patient of the renovation. Italian's da + infinitive makes this passive sense explicit: una casa da ristrutturare means "a house [waiting] to be renovated." The infinitive looks active in form but reads as passive in interpretation.

This is why grammar books sometimes call da + infinitive an infinitive of obligation or a gerundive infinitive. Whatever the label, the function is consistent: the noun is what needs something done to it, or the situation is what demands an action.

4. Use 3: Worth doing / recommended

A close cousin of the obligation use, this pattern expresses deserving, worth, recommendation. The infinitive describes an action the noun deserves or invites.

The line between obligation ("a book that needs reading") and recommendation ("a book worth reading") is sometimes context-dependent. Un libro da leggere covers both: the priest assigning catechism homework and the friend recommending a novel both use the same Italian phrase. Context disambiguates.

5. Use 4: Descriptive / characterizing

The fourth pattern doesn't use an infinitive — it uses da + noun to characterize another noun. This is da at its most idiomatic, marking kind of, characteristic of, befitting.

This use shades into simile — comparing the noun to a category. Occhi da bambino doesn't mean "eyes belonging to a child"; it means "eyes that look like a child's." When you want to mean "eyes belonging to a child," Italian uses di: gli occhi di un bambino. The two prepositions split:

• Da = characteristic of, befitting, like (typological)
• Di = belonging to, of (possessive)

The semantic difference is subtle but real. In context, both can be true at once — "il sorriso da padre" of someone who is a father carries both senses simultaneously.

6. Da vs per: the master diagnostic

The single most useful contrast in this whole topic. Da and per both express purpose, but they attach to different things and answer different questions.

A useful test: if the infinitive can be replaced by "in order to + verb," you want per. If the infinitive describes what something is for or needs to have done to it, you want da.

7. Fixed expressions with da + infinitive

Some constructions have crystallized into idioms that you should recognize and produce as wholes:

8. Da + infinitive in real contexts

A short tour of natural sentences across the four uses:

9. Italian vs English: where the two diverge

For an English speaker, the da + infinitive construction is foreign in two ways:

1. English distributes the work across multiple structures. What Italian compresses into "una tazza da tè" English splits into compounding (teacup), into infinitives of purpose (a cup to drink tea from), into adjectival phrases (a tea cup, a cup for tea). When converting English to Italian, look for the noun + da + infinitive pattern as a tight, single-unit replacement.
2. English has no equivalent of the obligation infinitive. Phrases like "a book to read, a house to renovate, nothing to declare" exist in English but feel marked, slightly old-fashioned, or formal. In Italian, un libro da leggere, una casa da ristrutturare, niente da dichiarare are everyday register.

The cure is exposure: read enough Italian and you'll start to feel when da is the right preposition without thinking.

10. Common mistakes

The most frequent transfer errors English speakers make.

11. Quick reference card

A compact decision tree for when to use da + infinitive:

The unifying logic: da attaches to a noun and tells you something about that noun. Per attaches to a verb and tells you something about that action. Internalize the split, and one of Italian's most economical constructions becomes one of your favorite tools.