Lesson 1: The Subjunctive — Formation and Purpose Clauses

Master all four tenses of the Latin subjunctive and learn to form purpose clauses with ut and ne.

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Why the Subjunctive Exists

Latin makes a grammatical distinction that English largely ignores: the difference between stating a fact and expressing something hypothetical, subordinate, or non-factual. The indicative mood states facts. The subjunctive carries everything else — purpose, result, reported speech, conditions, concession, and doubt.

You cannot read authentic classical Latin without the subjunctive. It appears in nearly every sentence of Caesar and Cicero. The good news: once you internalize the formation rules and the handful of clause types, subjunctives become pattern-recognition rather than guesswork.

1. Present Subjunctive Formation

The key insight: each conjugation uses a different vowel marker, and those vowels form a near-mnemonic sequence.

The Vowel Trick: "She Is Afraid" (or LLAMA minus one L)

Conjugation Marker Trick
1st (-āre) -ē- The only one that changes its stem vowel
2nd (-ēre) -eā- Adds -ā- to the -e- stem
3rd (-ere) -ā- Adds -ā- to the short stem
4th (-īre) -iā- Adds -ā- to the -i- stem

Mnemonic: "The 1st conjugation lady got everything changed; the rest just added -ā-."

Full Present Subjunctive Tables

1st conjugation — amō, amāre (love)

Person Active Passive
1sg amem amer
2sg amēs amēris
3sg amet amētur
1pl amēmus amēmur
2pl amētis amēminī
3pl ament amentur

2nd conjugation — moneō, monēre (warn)

Person Active Passive
1sg moneam monear
2sg moneās moneāris
3sg moneat moneātur
1pl moneāmus moneāmur
2pl moneātis moneāminī
3pl moneant moneantur

3rd conjugation — regō, regere (rule)

Person Active Passive
1sg regam regar
2sg regās regāris
3sg regat regātur
1pl regāmus regāmur
2pl regātis regāminī
3pl regant regantur

4th conjugation — audiō, audīre (hear)

Person Active Passive
1sg audiam audiar
2sg audiās audiāris
3sg audiat audiātur
1pl audiāmus audiāmur
2pl audiātis audiāminī
3pl audiant audiantur

Esse (to be) — present subjunctive

Person Form
1sg sim
2sg sīs
3sg sit
1pl sīmus
2pl sītis
3pl sint

2. Imperfect Subjunctive Formation

Rule: Present infinitive + active personal endings.

This is the easiest tense to form. Take the present infinitive (the form you look up in the dictionary), and add: -m, -s, -t, -mus, -tis, -nt.

Verb Infinitive 1sg 2sg 3sg 1pl 2pl 3pl
amō amāre amārem amārēs amāret amārēmus amārētis amārent
moneō monēre monērem monērēs monēret monērēmus monērētis monērent
regō regere regerem regerēs regeret regerēmus regerētis regerent
audiō audīre audīrem audīrēs audīret audīrēmus audīrētis audīrent
sum esse essem essēs esset essēmus essētis essent

3. Perfect and Pluperfect Subjunctive

Perfect Subjunctive Active

Rule: Perfect active stem + -eri- + active personal endings.

From amō: perfect stem = amāv-

Person Form
1sg amāverim
2sg amāverīs
3sg amāverit
1pl amāverīmus
2pl amāverītis
3pl amāverint

Esse perfect subjunctive: fuerim, fuerīs, fuerit, fuerīmus, fuerītis, fuerint.

Perfect Subjunctive Passive

Rule: Perfect passive participle (PPP) + present subjunctive of esse (sim/sīs/sit...).

amātus sim, amātus sīs, amātus sit...

Pluperfect Subjunctive Active

Rule: Perfect active stem + -issē- + personal endings.

Person Form
1sg amāvissem
2sg amāvissēs
3sg amāvisset
1pl amāvissēmus
2pl amāvissētis
3pl amāvissent

Pluperfect Subjunctive Passive

Rule: PPP + imperfect subjunctive of esse (essem/essēs...).

amātus essem, amātus essēs, amātus esset...

4. Sequence of Tenses

Latin grammar controls which subjunctive tense you use based on the tense of the main verb. This is called sequence of tenses.

Main Verb Tense Sequence Contemporaneous action Prior action
Present, Future, Future Perfect Primary Present subjunctive Perfect subjunctive
Imperfect, Perfect, Pluperfect Secondary Imperfect subjunctive Pluperfect subjunctive

How to apply:

  1. Identify the main verb and its tense.
  2. Determine primary or secondary sequence.
  3. Ask: does the subordinate action happen at the same time as the main verb, or before it?
  4. Choose the appropriate subjunctive tense.

5. Purpose Clauses

Definition: A purpose clause expresses the intention or goal behind the action of the main verb.

Structure:

  • Positive purpose: ut + subjunctive
  • Negative purpose: nē + subjunctive
  • Tense follows sequence of tenses.

Core rule: If the main verb is in primary sequence, use present subjunctive. If secondary, use imperfect subjunctive.

Worked Examples

Example 1 — Primary sequence, positive:

Venit ut videat. He comes in order to see. (main verb: venit present → primary → present subj.)

Example 2 — Secondary sequence, positive:

Vēnit ut vidēret. He came in order to see. (main verb: vēnit perfect → secondary → imperfect subj.)

Example 3 — Negative purpose:

Discessit nē caperētur. He left in order not to be captured. (Caesar, BG style; discessit perfect → secondary → imperfect subj. passive)

Example 4 — Caesar, BG 1.3:

Iter facere coeperunt ut... ex finibus suis exirent. They began to march in order to leave their territory. (secondary → imperfect subj.)

Example 5 — Cicero, Cat. 1.1:

Vīvimus ut rempūblicam cōnservēmus. We live in order to preserve the republic. (primary → present subj.)

Example 6 — Indirect command contrast:

Lēgātōs mīsit quī pācem peterent. He sent envoys to seek peace. (relative clause of purpose with quī + subj. — an alternative to ut)

Example 7 — Negative purpose in Caesar:

Pontem rescidit nē hostēs trānsīrent. He cut the bridge so that the enemy would not cross. (BG 1.13 style)

Example 8 — Primary, negative:

Tacet nē errōrem suum dētegat. He is silent lest he reveal his mistake. (primary sequence)

Example 9 — With reflexive:

Ad flūmen contendit ut sē reciperet. He hurried to the river to withdraw. (reflexive sē refers to subject of main verb)

Example 10 — Cicero, purpose after verb of motion:

Rōmam vēnit ut ōrātiōnem habēret. He came to Rome in order to deliver a speech.

6. Relative Clauses of Purpose

When the main verb implies sending or choosing someone, Latin often uses a relative clause of purpose instead of ut:

Mīsit lēgātōs quī pācem peterent. He sent envoys who were to seek peace / to seek peace.

The relative pronoun (quī, quae, quod) takes the subjunctive. This construction is very common in Caesar.

Practice Exercises

Exercise A — Identify purpose clauses

Mark each ut/nē clause as purpose (P) or something else (O):

  1. Sciō cur hoc faciat. — O (indirect question)
  2. Vēnit ut cīvēs monēret. — P
  3. Ita dīxit ut omnēs crēderent. — O (result clause)
  4. Nē caperētur, fūgit. — P (inverted purpose clause)
  5. Rogāvit nē discēderēmus. — O (indirect command)

Exercise B — Determine sequence and choose correct subjunctive

Complete each purpose clause with the correct tense:

  1. Venit ut eum ____ (vidēre). → videat (primary)
  2. Cucurrit ut eum ____ (vidēre). → vidēret (secondary)
  3. Mittit nūntium ut pācem ____ (petere). → petat
  4. Mīsit nūntium nē hostēs ____ (trānsīre). → trānsīrent

Exercise C — Transform to add a purpose clause

Add a purpose clause to each sentence using the cue in parentheses:

  1. Diū in agrō manet. (to protect the crops) → Diū in agrō manet ut frūmentum dēfendat.
  2. Ad urbem cucurrit. (not to be seen by enemies) → Ad urbem cucurrit nē ab hostibus vidērētur.

Summary Table

Clause type Conjunction Mood Tense rule
Purpose (positive) ut Subjunctive Sequence of tenses
Purpose (negative) nē Subjunctive Sequence of tenses
Relative purpose quī/quae/quod Subjunctive Sequence of tenses