The Conditional With θα

English builds would out of a special auxiliary. Greek builds it out of two things you already own: the future particle θα and an ordinary past tense. That is the whole conditional — there is no new set of endings to learn on this page, only a new combination, and a piece of logic that explains why a past tense is the natural way to say something is not true.

Same θα — look at the verb behind it

θα never changes and never means anything by itself. What it does depends entirely on the tense of the verb it sits in front of, and that is the single fact this subgroup rests on:

The last row is the honest complication, and it is better met now than later. Because θα plus a past tense also does duty as a guess — Θα ήταν αργά "it must have been late" — the string θα ήταν can be either "it would be" or "it must have been". Nothing in the form separates them; a hypothetical frame pulls one way, present evidence the other. That second life belongs to θα for probability and inference, which owns it in full.

Why a past tense means "unreal"

At first this looks arbitrary: why should "I would write" be built on "I was writing"? It is not arbitrary at all, and English gives the game away. Look at what English does inside an if-clause: "If I had time…", "If I were rich…" — those are past tenses used about the present, and every English speaker produces them without thinking. The past tense here is not about time. It is about distance: stepping the verb back one notch signals that the situation is being held at arm's length, not asserted as real.

Greek runs the same trick, and runs it on both halves of the sentence rather than just the if-clause. The condition steps back into the past (αν είχα) and so does the result (θα ερχόμουν), with θα added to mark that the result is a consequence rather than a report. Once you see the past tense as a distance marker, the whole system becomes predictable: one step back (imperfect) for a present or general hypothesis, two steps back (pluperfect) for something that is over and cannot be changed.

The two members at work

θα + imperfect covers everything imaginary that is still open in principle — the present, the general, the merely wished-for. θα + pluperfect covers what is finished and did not happen. Each has its own page (the present conditional, the past conditional); here is the contrast in a pair of everyday sentences.

How the halves pair up

A full conditional sentence has a condition (the αν-clause) and a result. The two are chosen together, and there are three standard pairings:

Two things fall out of that table. First, θα lives in the result clause only: the αν-clause is bare, however far into the imaginary it goes. Second, the sentence-level machinery — mixed pairs, the other conditional conjunctions, word order between the halves — is a topic in its own right and is treated on conditional sentences and unreal conditionals. This page stays with the verb forms.

No αν needed: the unspoken condition

A conditional does not require an if-clause at all. Very often the condition is left implicit — carried by a phrase like στη θέση σου ("in your place"), χωρίς αυτό ("without that"), με άλλες συνθήκες ("in other circumstances"), or by nothing but the situation. The verb form alone is enough to signal that you are talking about a world that is not the actual one.

This is also where politeness comes from: a request phrased as a hypothesis (Θα ήθελα…, Θα μπορούσατε…;) is less pushy than one phrased as a fact, precisely because the conditional refuses to assert anything. That whole register belongs to the conditional for politeness.

The same two forms also carry wishes. A wish still open takes μακάρι να + present or perfective (Μακάρι να έρθει!); a wish about what is not so steps back exactly as a conditional does (Μακάρι να ήμουν εκεί, Μακάρι να μην το είχα πει). Those are on wishes with μακάρι and counterfactual wishes and regret. The modal verbs that share this machinery are on πρέπει, μπορώ and θέλω να.

The third job: the future-in-the-past

Here is a use of θα + imperfect that has nothing to do with hypotheses, and that learners rarely meet in textbooks. When you report, from a past standpoint, something that was still ahead at that moment, Greek uses the same shape — exactly English's "he said he would come".

One honest qualification, because English speakers over-apply this. Greek does not force the backshift the way English does: Μου είπε ότι θα έρθει ("he told me he'll come") is perfectly ordinary, and is what you will hear when the arrival still lies ahead at the moment of speaking. The imperfect version views the promise from inside the past — which is why it so often carries the flavour "…and it never happened". The general rules for tense inside a reported clause are on tense in reported speech.

Common Mistakes

1. Putting θα in the αν-clause. Colloquial English allows "if I would have time", and speakers of several other European languages have a would in the if-clause too. Greek does not: the condition is bare and only the result carries θα.

2. Using αν και for "if". The two words together are a different conjunction: αν και means "although". Adding it to a conditional produces a sentence that says the opposite of what you meant.

3. Slipping an adverb between θα and the verb. English happily says "would definitely come" and "would always help". In Greek nothing may stand between θα and its verb except the weak object pronouns; the adverb goes in front of θα or after the verb.

4. Answering an open condition with a conditional. When the condition may well come true and the result is a plain commitment, the result clause takes the future. Reaching for θα + imperfect turns your promise into something you are quietly ruling out. (One exception: a deliberately hedged result. Αν θέλεις, θα μπορούσαμε να πάμε σινεμά and Θα ήθελα να σας ρωτήσω κάτι, αν έχετε χρόνο are both normal — there the conditional is doing politeness, not unreality.)

Key Takeaways

• Greek has no conditional endings: the conditional is θα + a past tense, and the tense you pick decides which conditional you get.
• θα + imperfect = "would do" (θα έγραφα); θα + pluperfect = "would have done" (θα είχα γράψει); θα + present/perfective is still the plain future.
• The past tense is a distance marker, not a time marker — the same logic behind English "if I were rich"; one step back for the present-unreal, two for the past-unreal.
• In a conditional αν-sentence, θα appears in the result clause and the condition stays bare (Αν είχα χρόνο, θα ερχόμουν) — the αν that means "whether" is a different word and takes θα freely.
• No αν is needed: στη θέση σου, με άλλες συνθήκες, or nothing at all can carry the condition — and this is also where the polite Θα ήθελα / Θα μπορούσατε come from.
• The same θα + imperfect is also the future-in-the-past (Μου είπε ότι θα ερχόταν) — though, unlike English, Greek does not require the backshift: Μου είπε ότι θα έρθει is equally normal — and, in other frames, an inference (Θα ήταν αργά). Context, not form, tells them apart.