Latin Reference — Vol. X: The Unreal

The last frontier of the main sequence. The indicative (Vols IV–VIII) states what is; the subjunctive imagines what isn't — yet, or ever: wishes, purposes, fears, commands, might-have-beens. Vol. VI heard it first, bending vowels on the Bath tablets (liquat, veniat); this volume is the system behind the bending. Everyone reading this has, in fact, been using the Latin subjunctive their whole lives — proof at the first aside.

Good news up front: only four tenses (there is no future subjunctive — the future is uncertain enough already), and two of the four are built from forms you can already say.

Present subjunctive — the vowel swap

Each conjugation swaps its signature vowel for a different one. The classic mnemonic for the new vowels, in conjugation order (ē, eā, ā, iā):

wE bEAt A lIAr.

Notice the deep pattern: the first conjugation — the ā-family — is the only place ā doesn't mean subjunctive, because ā is its ordinary vowel; it swaps to ē instead. Everywhere else, an unexpected ā is the smell of a wish. That is exactly what Vol. VI taught by ear: venit → veniat, facit → faciat.

And the trap foreshadowed in Vol. VIII springs shut: regam is both "I shall rule" (future) and "may I rule" (subjunctive). Identical forms; context referees. Latin apparently agreed that the first person future is half a wish anyway.

Sum: sim, sīs, sit, sīmus, sītis, sint.

Imperfect subjunctive — the free one

Take the infinitive and add the personal endings. That's the whole rule:

The easiest formation in the language — regere → regerem, audīre → audīrem, esse → essem — and it works for every verb without exception, including the irregulars. Hear the infinitive inside it and it can never be mistaken for anything else.

Perfect and pluperfect subjunctive

Both live on the perfect stem (Vol. VIII):

The pluperfect repeats the imperfect's trick one storey up: amāvisse (to have loved, Vol. IX) + -m. Two of the four tenses are therefore "an infinitive with endings on" — the subjunctive is half made of parts you already own. (The perfect subjunctive resembles Vol. VIII's future perfect nearly everywhere; only the first person singular — -erim vs -erō — tells them apart on sight. Context, again, referees.)

Wishes and commands — the subjunctive standing alone

The mood's home ground, and the source of its most famous survivals:

Aside — you already read the subjunctive daily. R.I.P. expands to requiēscat in pāce — may he/she rest in peace — a third-person wish-subjunctive: -at where requiēscit would state. Its pagan ancestor is carved on Romano-British stones as S T T L: sit tibi terra levis — may the earth be light upon you — with sit the subjunctive of sum. Two thousand years of gravestones, and the mood has never once changed: the dead are wished well, never merely described. Vol. V called a tombstone a letter in the dative; add now that its verb is a wish.

Purpose — ut and nē

Latin expresses in order to with ut (+ subjunctive), and in order that…not with nē:

Venit ut templum videat. — He comes to see the temple — literally, "that he may see." Mūrum faciunt nē hostēs veniant. — They build a wall so the enemy won't come.

The logic is pure subjunctive: a purpose is a wished-for outcome, unreal at the moment of acting. Rome built a rather long example of the second sentence across northern Britain.

Indirect commands — Claudia Severa, fully parsed

Vol. V quoted the Vindolanda birthday letter and asked for patience. Patience expires now:

rogō … ut veniās — I ask that you come.

Rogō launches it; ut + present subjunctive veniās carries it. Asking, ordering, begging, advising (rogō, imperō, petō, moneō) all take this shape — because a request, like a purpose, lives in the not-yet. The earliest surviving Latin in a woman's hand runs on this construction, which seems a fair endorsement of its usefulness.

Vol. IX's boundary stone stands confirmed: reported facts take accusative-and-infinitive; reported wants take ut + subjunctive.

Indirect questions

A question folded inside another sentence goes subjunctive:

The question word (quid, ubi, cūr, quis) stays; the verb bends. Sciō quid fēcerīs — the perfect subjunctive as the tense of I know what you did, which is also, pleasingly, the register of every curse tablet's opening suspicion.

Cum-clauses

Cum with the subjunctive means when, since, or although — context chooses:

Cum Rōmānī vēnissent, Britannī in collibus manēbant. — When (or since) the Romans had come, the Britons stayed in the hills.

Pluperfect subjunctive vēnissent: the coming complete before the staying. (Cum + ablative is still the preposition with, Vol. I — position and the verb's mood tell you which cum has arrived.)

Conditions — the might-have-been

The subjunctive's most human job. Real conditions take the indicative (Vol. VIII's sī vīderis, dabis); unreal ones go subjunctive, and the tense sets the flavour of regret:

Two clauses, both subjunctive, tenses matched. The pluperfect pattern is the grammar of every retrospective sigh in the language.

Aside — the Spanish inheritance, again. The subjunctive is the part of Latin most alive today: every Spanish que venga, French qu'il vienne, Italian che venga is this volume still running. And one crossing of wires worth knowing: the Spanish -ra subjunctive (si hubieras venido…) descends from the Latin pluperfect indicative (amāveram, Vol. VIII) — a tense that jumped moods on the way down the centuries. Anyone who has sweated Spanish subjunctive drills has been doing advanced Latin without credit.

Sequence of tenses — the one-line version

Main verb in a present/future tense → present or perfect subjunctive in the clause. Main verb in a past tense → imperfect or pluperfect. That pairing (rogat ut veniās but rogāvit ut venīrēs) is the whole discipline in miniature; the fine print can wait for real texts to make it matter.

Worked sentences

The drill

Three graded passes. One: vowel-swap drill — take any Vol. IV present indicative and bend it (videt → videat, capit → capiat), saying both aloud; the drill of the curse tablets, now understood. Two: the free forms — infinitive + endings, ten verbs, imperfect then pluperfect (mittere → mitterem; mīsisse → mīsissem). Three: the regret machine — build three sī… vīssem/-issem sentences about your own week; if one of them is about a missing ring, the library will consider its work done. The main sequence now runs 0 to X, and every mood, tense and case in Romano-British stone, lead and ink is on the shelf behind you.