Conditionals: Complete Reference

Italian conditional sentences form a tightly coordinated system: an if-clause (the protasi) sets a condition, and a main clause (the apodosi) states what follows. Italian is unusually strict about the tense pairings allowed in this system — far stricter than English or even Spanish — and getting the pairings wrong is one of the most recognizable markers of foreign speech. This page brings together everything: the three canonical types, mixed types, the colloquial workaround, formal conjunctions, and the errors that even advanced learners keep making.

The core principle is simple: the tense in the se-clause and the tense in the main clause are tied together. Choose one and the other is essentially fixed. Once you internalize the three canonical pairings, you can speak about real, hypothetical, and counterfactual situations with confidence.

Section 1: The three canonical types

Every Italian conditional you produce should fit one of these three patterns unless you have a specific reason to depart from them.

Section 2: Examples for each type

Type 1 — Real conditions

The condition is treated as factual or genuinely possible. Both clauses use the indicative.

Note that Italian, unlike English, allows se + futuro in the if-clause when both events are in the future — this is a distinctive Italian preference: "Se avrai tempo, passa a trovarmi" (If you have time later, drop by).

Type 2 — Hypothetical conditions

The speaker frames the condition as imaginary, unlikely, or contrary to current reality. Italian uses congiuntivo imperfetto in the se-clause and condizionale presente in the main clause.

Type 3 — Counterfactual past

Looking back at events that did not happen and saying what would have happened if they had. The se-clause uses congiuntivo trapassato, the main clause condizionale passato.

Section 3: Mixed types

Real conversation isn't always neatly aligned. Two patterns occur often.

Past condition, present/future result — a counterfactual past that still affects the present:

The structure is se + congiuntivo trapassato → condizionale presente (past unreal condition + present unreal consequence).

Present condition, past result — much rarer, but possible: "If you were really my friend (= as you are now), you would have helped me yesterday."

Section 4: The colloquial substitution

In informal speech, Italians frequently replace Type 3 entirely with imperfetto indicativo + imperfetto indicativo:

A second colloquial variant uses imperfetto + condizionale presente for what would standardly be a Type 2:

This is more frowned upon than the all-imperfetto form and should be avoided actively.

Section 5: Alternative conjunctions

Beyond se, Italian has a rich set of conjunctions that introduce conditions. All of them require the subjunctive in the clause they introduce — this is non-negotiable.

Note especially a meno che — in standard Italian it takes a pleonastic non (an expletive negation that does not actually negate):

The choice between subjunctive tenses (presente vs imperfetto vs trapassato) inside these clauses follows the same logic as Type 1/2/3 — pick the tense that matches the temporal frame of the condition.

Section 6: Tense matching — what works and what doesn't

This is the section to memorize.

Standard pairings (always safe):

Pairings that are wrong (and recognized as foreign-sounding):

Section 7: Decision tree

When you want to build a conditional sentence, ask these questions in order:

1. Is the condition real, possible, or treated as a fact? → Type 1 (indicative + indicative).
2. Is the condition imaginary, unlikely, or contrary to current reality, but still about the present or future? → Type 2 (congiuntivo imperfetto + condizionale presente).
3. Is the condition about the past, contrary to what actually happened? → Type 3 (congiuntivo trapassato + condizionale passato).
4. Does the past condition have a present/future consequence? → Mixed (congiuntivo trapassato + condizionale presente).
5. Are you in a formal register, or do you need a non-se conjunction (unless, provided, in case)? → Choose the appropriate conjunction (a meno che non, purché, qualora, nel caso) and use the subjunctive.
6. Is the situation casual conversation about a past unreal event and you want to sound colloquial? → You can use imperfetto + imperfetto, but recognize this as (informal).

Section 8: Common mistakes

Section 9: Comparison with English

English speakers carry over three habits that produce wrong Italian:

1. Using "would" in the if-clause. English itself prohibits "If I would have time, I would come" in standard usage, but many learners produce Se avrei tempo, verrei. Block this absolutely. The conditional belongs only in the apodosis.

2. Treating "if" as one word. English if is one tool; Italian se is the most common but not the only one. Conditional clauses introduced by unless, provided, in case, should, assuming in English map to different conjunctions in Italian, all of which take the subjunctive: a meno che non, purché, nel caso, qualora, ammesso che.

3. Underusing the future in if-clauses. English does not allow If you will have time, call me; Italian does and even prefers it: Se avrai tempo, chiamami. This Italian-specific pattern signals "if at some future moment X holds, then..."

Key takeaways

• Three canonical types, three fixed pairings: real (indicative + indicative), hypothetical (congiuntivo imperfetto + condizionale presente), counterfactual (congiuntivo trapassato + condizionale passato).
• Mixed types exist for past conditions with present consequences — both clauses still match a recognized pattern.
• The conditional mood never appears in the se-clause.
• Alternative conjunctions (a meno che non, qualora, nel caso, purché, etc.) all take the subjunctive.
• The colloquial imperfetto + imperfetto pattern is widespread in speech but firmly informal — recognize it, save it for casual moments, and avoid it in writing.