Relative Clauses: Complete Reference

This page is the one-stop reference for everything Italian relative clauses do. Other pages in this group cover individual relativizers in depth; this one shows them all together, side by side, so you can pick the right tool for any situation. By the end you should be able to write a sentence that uses che, cui, il quale, and dove correctly, and you should know which one to reach for in any given context — including the situations where Italian forces you to use a subjunctive inside the relative clause that English would not.

The four relativizers at a glance

Everything below elaborates this table.

1. Che — the workhorse

Che does two jobs: subject of the relative clause and direct object of the relative clause. It never changes form, it never takes a preposition, and it covers maybe 70% of the relative clauses you will ever produce.

A common English-speaker error is to drop che the way you can drop that in English (the book I bought). Italian does not allow this — the relative pronoun is always present.

2. Cui — the prepositional pronoun

Cui is what you use whenever the relative pronoun is the object of a preposition. It is invariable in form, and the preposition must appear before it (Italian does not allow preposition stranding — see section 8).

Cui = "whose"

When sandwiched between an article and a noun, cui translates English whose:

The article agrees with the possessed thing, not with the possessor — exactly as it does with possessive adjectives. Il cui romanzo uses il because romanzo is masculine singular; the gender of the author is irrelevant.

3. Il quale — formal and disambiguating

Il quale (and its inflected forms la quale, i quali, le quali) is the formal, fully-inflected alternative. It is used in two distinct situations: (a) in formal writing where it adds gravity, and (b) when che or cui would be ambiguous and you need to make crystal clear which noun the relative clause refers to.

After prepositions, il quale forms contracted articulated prepositions: del quale, al quale, dal quale, nel quale, sul quale. These are the formal-register equivalents of di cui, a cui, da cui, in cui, su cui.

4. Dove — locative

Dove ("where") substitutes for in cui or nel quale when the antecedent is a place. It cannot be used for time, and it cannot follow most prepositions (you say da dove but not normally con dove).

For time, use in cui or che, never dove:

5. Restrictive vs non-restrictive

Italian, like English, distinguishes restrictive relative clauses (which identify or limit the antecedent) from non-restrictive ones (which add extra information). The grammatical difference is shown by commas: restrictive has none, non-restrictive has them.

Restrictive (defining — no commas):

Non-restrictive (additive — with commas):

In non-restrictive clauses, il quale is especially common — its inflection makes the reference clearer when the clause is just providing additional information.

6. Subjunctive triggers in relative clauses

This is where Italian relative clauses differ sharply from English. Certain types of antecedents force the verb in the relative clause into the congiuntivo. Master these four triggers and you have most of the subjunctive-in-relatives system covered.

Indefinite antecedent

If the apartment is already known and identified, the indicative comes back:

Negative antecedent

Superlative antecedent

Unique / "the only" antecedent

7. Past participle agreement

In compound tenses with avere, when che is the direct object and the preceding-direct-object trigger applies, the participle may agree with the antecedent. In modern Italian, leaving the participle bare is the standard choice; agreement is felt as slightly literary or old-fashioned.

With clitics, agreement is obligatory:

8. Pied-piping: no preposition stranding

Italian does not allow you to leave a preposition at the end of a clause the way English routinely does. The preposition must come with the relative pronoun, immediately before it.

This is one of the cleanest categorical differences between the two languages. The English speaker's instinct is to push the preposition to the end of the clause; resist it.

9. Choosing between che, cui, il quale, dove

A practical decision tree:

1. Is the relative pronoun the subject or direct object? → use che.
2. Is the relative pronoun the object of a preposition? → use preposition + cui (informal/neutral) or preposition + il quale (formal).
3. Are you expressing "whose"? → article + cui + noun.
4. Is the antecedent a place and would the preposition be 'in' or 'at'? → use dove.
5. Is the antecedent ambiguous and you need to mark its gender/number? → switch to il quale.

Common mistakes

Key takeaways

Relative clauses in Italian rest on a four-pronoun system — che, cui, il quale, dove — that maps cleanly to grammatical function: subject/object → che; prepositional → cui or il quale; locative → dove; "whose" → article + cui + noun. Layered on top is the subjunctive system: indefinite, negative, superlative, and unique antecedents trigger the congiuntivo in the relative clause, a distinction English speakers often miss because their language no longer marks it. Three further rules complete the picture: commas distinguish restrictive from non-restrictive clauses; the relative pronoun cannot be dropped, ever; and prepositions cannot be stranded, ever. Internalize these moves and your Italian writing will lose one of the most common non-native fingerprints — choppy, English-style sentences without proper subordination. The four pronouns interact with register too: in spoken Italian and informal writing, che and cui dominate; in formal or academic prose, il quale appears more often, often to disambiguate a referent across a long sentence. Knowing which form to reach for in which register is part of what distinguishes confident B2-level writing from B1-level writing that is technically correct but tonally flat. Read enough Italian — newspapers, novels, academic articles — and the right choice will become automatic.