Imperfect Subjunctive: Formation

The Latin imperfect subjunctive is unusually friendly to form: for almost every ordinary active verb, take the present active infinitive—the second principal part—and add the active personal endings. Thus amāre gives amārem, and dūcere gives dūcerem. That visible infinitive is the best recognition clue, but the resulting form is finite: dūcerent means “they might lead / were leading” in an appropriate construction, not “to lead.” Passive forms and the passive-looking forms of deponents are treated separately in Present and Imperfect Passive Subjunctive.

The name imperfect describes a tense in Latin’s subjunctive system, not one fixed English translation. It commonly represents an action simultaneous with or later than a past governing verb; it also expresses a present contrary-to-fact situation. Formation comes first, clause function second, translation last.

The productive pattern

Start from the second principal part and replace nothing. Add -m, -s, -t, -mus, -tis, -nt directly to the full infinitive:

The full active paradigm of amō, amāre, amāvī, amātum is:

In the conventional pedagogical paradigm, the formational ē is long in the second singular, first plural, and second plural (amārēs, amārēmus, amārētis). It is short in the first singular, third singular, and third plural (amārem, amāret, amārent). All these are ordinary, register-neutral Classical forms. Poetry may exploit quantities, but it does not create a different basic paradigm.

Here tacērent comes transparently from tacēre + -nt. It is third-person plural, active, imperfect subjunctive. The indirect question explains the mood; the past rogāvit helps explain the tense.

English uses an infinitive, but Latin peterent is a finite imperfect subjunctive: petere + -nt. Translating first would hide both its plural subject and its relation to the past verb mīsit.

Why the infinitive appears inside a finite form

The classroom rule “infinitive plus endings” is a reliable production rule, not a claim that the form remains syntactically infinitive. Historically, the imperfect subjunctive contains an element related to -sē-; Latin sound changes produced the familiar -rē- shape in most verbs. For reading, the synchronic fact matters: the second principal part predicts the form.

This rule also explains why conjugation differences remain visible. Fourth-conjugation audīre keeps long ī in audīrem; third-conjugation dūcere gives dūcerem, not dūcīrem. Third-conjugation -iō verbs use their actual infinitive: facere → facerem, capere → caperem.

There are two infinitive-looking sequences here, but only facere is an infinitive. Dēbērēmus has first-person plural -mus, so it is imperfect subjunctive in an indirect question.

The result clause has possent. Although possum is irregular elsewhere, this form follows the exact infinitive mechanically: posse + -nt. Its function is past-contextual, but English naturally says “could,” not “might have been able.”

Apparent irregularity: sum and its compounds

The verb sum, esse, fuī does not produce esserem. In fact, it confirms the rule rather than breaking it: add the personal ending to the exact infinitive, esse + -m → essem. Its full paradigm is essem, essēs, esset, essēmus, essētis, essent. Compounds behave the same way: posse + -m → possem, adesse + -m → adessem, and abesse + -nt → abessent.

Historically, these forms preserve the inherited -ssem- shape, while intervocalic s became r in forms such as amārem. Synchronically, however, a learner needs no exception: use the infinitive actually listed in the principal parts and do not insert an extra -re-.

The second sentence shows why “imperfect” cannot simply mean past. Habērem and emerem describe a present unreal condition and consequence. The Latin tense helps encode remoteness from present fact; English uses “had” and “would buy.” This independent conditional use is register-neutral in prose and conversation represented in drama.

A disciplined parsing sequence

For audīrētis, proceed in this order:

1. Identify -tis as second-person plural.
2. Recognize audīre immediately before it, the second principal part of audiō.
3. Parse imperfect subjunctive active.
4. Inspect the clause: purpose, result, indirect question, subordinate clause in past sequence, wish, or unreal condition.
5. Only then choose “you were hearing,” “you might hear,” “for you to hear,” or another contextual English rendering.

The form acciperēs is morphologically imperfect, even though idiomatic English uses “would accept” for this later action viewed from a past point. Latin tense selection and English auxiliary choice do not map word for word. The broader principles belong on Sequence of Tenses; the visible form itself remains accipere + -s.

Register and textual variation

The imperfect subjunctive is core Classical grammar in every prose register. It is not inherently (formal) merely because English sometimes translates it with “might” or “were to.” In (literary) poetry, word order and omitted subjects can make the governing construction harder to see, but the formation is the same. Archaic Latin sometimes preserves formations and spellings outside the standard Classical system; those must be learned from their lexical context, not generated as alternative regular paradigms.

An imperial wish reported by Suetonius is often presented in this normalized, pedagogically macronized form:

The transmitted (literary) context has unmacronized haberet; the teaching form habēret makes its quantity visible. It is the ordinary third-person singular imperfect subjunctive of habeō.

Common Mistakes

1. Inventing a regular infinitive from the first principal part.

Vellem can mean “I would want” or simply “I wanted” in a dependent context. The first principal part volō does not license a new infinitive; the real second principal part velle supplies the whole base.

2. Treating the visible infinitive as a real infinitive.

The contrast is structural: fugere has no personal ending; fugerent has -nt. An ordinary indirect statement can indeed use accusative servōs plus infinitive fugere, but an indirect question introduced by cūr requires a finite subjunctive.

3. Using the present stem while discarding the infinitive ending.

4. Adding an extra -re- to the infinitive of sum.

Key Takeaways

• Use the second principal part: amāre + -m → amārem.
• Recognize -rem, -rēs, -ret, -rēmus, -rētis, -rent as the active pattern.
• Apply the same rule to exact infinitives such as esse, posse, and velle: essem, possem, vellem.
• Parse the Latin form before translating. “Imperfect” does not guarantee an English past tense.