A counterfactual condition imagines an alternative to something you already know to be false: if I'd had the money, I would have bought it — but you didn't have the money, and you didn't buy it. English marks this with a past-perfect if-clause and would have in the result. Turkish marks it with a single stacked suffix, -sAydI, in the if-clause and the past aorist -Irdi (or future-in-the-past -AcAktI) in the result. The two halves are a matched set: see -sAydI and you expect -Irdi. Master that frame and you can talk about every road you didn't take.
How -sAydI is built
The form is transparent once you see the layers. Take the conditional -sA, then add the copular past -(y)DI on top of it:
stem + -sA + -(y)DI → -sAydI
So gel- "come" gives gel + se + ydi = gelseydi "if he had come." The buffer -y- appears because the conditional -se ends in a vowel and the past -DI would otherwise collide with it. Personal endings sit at the very end: gelse*ydim, gelseydin, gelseydi, gelseydik*.
| Person | gelmek (come) | almak (take/buy) | bilmek (know) |
|---|---|---|---|
| 1sg | gelseydim | alsaydım | bilseydim |
| 2sg | gelseydin | alsaydın | bilseydin |
| 3sg | gelseydi | alsaydı | bilseydi |
| 1pl | gelseydik | alsaydık | bilseydik |
| 2pl | gelseydiniz | alsaydınız | bilseydiniz |
| 3pl | gelselerdi / gelseydiler | alsalardı / alsaydılar | bilselerdi / bilseydiler |
The plural can place the -lAr before the past (gelseler-di) or after (gelseydi-ler); both are heard, with gelseydiler the more colloquial.
The matched result: -Irdi (past aorist)
The result clause of a counterfactual is the past aorist — the aorist plus the copular past, -Ir + -DI = -Irdi. This is Turkish's dedicated "would have" machinery; it is the same form that means "used to" in other contexts, but in a counterfactual frame it reads as the unreal consequence.
Param olsaydı o evi alırdım.
If I'd had the money, I would have bought that house.
Beni dinleseydin bu hâle düşmezdin.
If you'd listened to me, you wouldn't have ended up like this.
Trafik olmasaydı çoktan varmıştık.
If there'd been no traffic, we'd have arrived long ago.
Read the second example as a two-part frame: dinleseydin (-sAydI) in the if-clause, düşmezdin (negative past aorist -mAzdI) in the result. The negative of -Irdi is -mAzdI: gelmezdim "I wouldn't have come." This map onto English if you had…, you would (not) have… is one of the cleanest correspondences in the whole grammar.
Bunu önceden bilseydim hiç gelmezdim.
Had I known this beforehand, I'd never have come.
Daha erken çıksaydık otobüsü kaçırmazdık.
If we'd left earlier, we wouldn't have missed the bus.
-AcAktI for "was going to"
When the unreal consequence is a plan rather than a general result, the apodosis can take the future-in-the-past -AcAktI instead of -Irdi: "would have been going to / was going to."
Davet etseydin kesinlikle gelecektim.
If you'd invited me, I would definitely have come.
Uçak rötar yapmasaydı şimdiye evde olacaktık.
If the plane hadn't been delayed, we'd be home by now.
The difference from -Irdi is subtle: -Irdi states a consequence as a fact-that-would-have-held, while -AcAktI frames it as a plan-that-would-have-unfolded. Both are correct counterfactual results; -Irdi is the default. For the formation of these past-shifted tenses, see the past of compound tenses.
keşke + -sAydI: regret and wishes
Pair keşke "if only / I wish" with -sAydI and you get the standard way to voice regret about the past. There is no result clause — the wish stands alone.
Keşke o soruyu hiç sormasaydım.
I wish I'd never asked that question.
Keşke gençken biraz daha çok seyahat etseydim.
I wish I'd traveled a bit more when I was young.
Keşke ona o son sözleri söylemeseydin.
I wish you hadn't said those last words to her.
Note the negative wish: sormasaydım (negative -mA- + -sA + -ydI) = "if only I hadn't asked." The contrast with present/future wishes is instructive: keşke gelse "if only he'd come (now/soon)" points at an open, still-possible world, while keşke gelseydi "if only he had come" points at a closed, already-lost one. The same keşke selects the time of the wish purely through -sA vs -sAydI. More on this on the keşke optative page.
A note on "present counterfactuals"
-sAydI also covers present counterfactuals — imagining a different now — when the result is a present-feeling state. Burada olsaydı çok mutlu olurdum can read as "if he were here (now), I'd be very happy." Turkish does not force a separate past-perfect; the same unreal frame stretches over an imagined present and an imagined past, and context disambiguates.
Yerinde olsaydım bu teklifi reddederdim.
If I were in your place, I'd turn down this offer.
Orthography of -sAydI
- The pieces: conditional -sa / -se (two-way harmony) + buffer -y-
- past -dı / -di / -du / -dü (four-way harmony, devoicing to -tı/-ti/-tu/-tü after voiceless consonants does not apply here because the conditional ends in the vowel a/e).
- Result: only four written shapes — -saydı, -seydi, -saydık/-saydım… harmonizing the -DI vowel: alsaydım, gelseydim, okusaydım, gülseydim.
- The result clause aorist-past: -ırdı / -irdi / -urdu / -ürdü and negative -mazdı / -mezdi: alırdım, gelirdim, görmezdim, almazdım.
- eğer may open the counterfactual but never replaces -sAydI.
Common mistakes
❌ Param olsa o evi alırdım.
Incorrect for a real missed past chance — open hypothetical -sA where a counterfactual is meant.
✅ Param olsaydı o evi alırdım.
If I'd had the money, I would have bought that house.
Bare olsa leaves the door open ("if I had money"); the closed past needs olsaydı.
❌ Beni dinleseydin bu hâle düşmedin.
Incorrect — plain past -DI in the result instead of the past aorist.
✅ Beni dinleseydin bu hâle düşmezdin.
If you'd listened to me, you wouldn't have ended up like this.
The result of a counterfactual is the past aorist (düşmezdin), not the plain past (düşmedin, which means "you didn't fall").
❌ Gelirsen çok sevinirdim.
Incorrect for a past missed visit — real-condition gelirsen mixed into a counterfactual.
✅ Gelseydin çok sevinirdim.
If you had come, I would have been delighted.
Don't fold a real-condition form (gelirse(n)) into a counterfactual; the if-clause must be -sAydI (gelseydin).
❌ Keşke gelseydi olur (extra olur after a standalone wish).
Incorrect — keşke wishes take no result clause or extra verb.
✅ Keşke gelseydi.
If only he had come.
Key takeaways
- A counterfactual = -sAydI in the if-clause + past aorist -Irdi (or -AcAktI) in the result.
- -sAydI = conditional -sA
- copular past -(y)DI; gelseydi "if he had come."
- The negative result is -mAzdI: gelmezdim "I wouldn't have come."
- keşke + -sAydI = past regret with no result clause; keşke + -sA keeps the wish open.
- Never let a real-condition form (gelirse) or a bare hypothetical (gelse) stand in for the closed-past -sAydI.
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- Real Conditions: -(y)sA on TensesB2 — Factual, open conditions formed by clipping -(y)sA onto a finished tense — gelirse, geliyorsa, geldiyse, gelecekse — with the result clause in the aorist or future.
- Wishes: keşke and the ConditionalB1 — Wishes use keşke 'if only / I wish' with the conditional or past-conditional — Keşke gelseydin 'I wish you had come', Keşke param olsa 'I wish I had money' — where keşke + -sAydI is the counterfactual 'wish X had…' and keşke + -sA is a present/future wish.
- Past of Tenses: -Iyordu, -Irdi, -AcAktI, -mIştIB1 — Turkish builds its imperfect, habitual-past, future-in-past and pluperfect simply by stacking the copular past -(y)DI onto a primary tense: geliyordu 'he was coming', gelirdi 'he used to come', gelecekti 'he was going to come', gelmişti 'he had come'.
- The Conditional SystemB1 — How Turkish encodes the reality of a condition by where the suffix -sA attaches — bare stem for hypotheticals, a full tense for real conditions, and -sAydI for counterfactuals.