3.2 Second conjugation

Overview of Second Conjugation

Second conjugation verbs are identified by their long -ē- stem vowel and their -ēre infinitive ending. This is one of the most common verb groups in Latin, including high-frequency verbs like moneō (I warn), videō (I see), and habeō (I have). Once you recognize the -ē- pattern, you can conjugate these verbs across every tense in the present and perfect systems.

Characteristics of Second Conjugation

Stem vowel -ē-

The long -ē- is what sets second conjugation apart. It appears in the present stem before personal endings and stays consistent through most forms. If you see that long -ē- running through a verb's forms, you're almost certainly dealing with a second conjugation verb.

Present infinitive ending -ēre

The infinitive ending -ēre (with a long ē) is the quickest way to identify second conjugation. Compare across conjugations:

• 1st conjugation: -āre (amāre, to love)
• 2nd conjugation: -ēre (monēre, to warn)
• 3rd conjugation: -ere (with a short e) (dūcere, to lead)
• 4th conjugation: -īre (audīre, to hear)

Pay close attention to vowel length here. The difference between 2nd conjugation -ēre and 3rd conjugation -ere is just that long vs. short ē, but it changes how the entire verb conjugates.

Principal Parts

Every Latin verb has four principal parts, and you need all four to conjugate it fully. For a regular second conjugation verb like moneō, they are:

moneō, monēre, monuī, monitus

First principal part: present active indicative (1st person singular)

Ends in -eō (moneō, "I warn"; videō, "I see"). This gives you the present stem, which you use for all present system tenses (present, imperfect, future).

Third principal part: perfect active indicative (1st person singular)

Regular second conjugation verbs often form the perfect in -uī (monuī, "I warned"). But many common verbs are irregular here:

• videō → vīdī (I saw)
• maneō → mānsī (I remained)
• iubeō → iussī (I ordered)

You get the perfect stem by dropping the final -ī from this form (monu-, vīd-, māns-). That stem is the basis for all perfect system tenses.

Fourth principal part: perfect passive participle

Regular verbs typically end in -itus (monitus, "having been warned"). Irregular forms include vīsus (seen), mānsus (having remained), and iussus (having been ordered). This participle combines with forms of sum to create the passive perfect system.

Present Tense Forms

Present active indicative

Add personal endings to the present stem. Here's the full paradigm for moneō:

Notice that the -ē- shortens before certain endings (monet, monent). This is a regular phonetic change, not an irregularity.

Present passive indicative

Swap in passive personal endings:

These translate as "I am warned," "you are warned," etc.

Present active subjunctive

The key trick: change the stem vowel -ē- to -ea-, then add regular personal endings. The mnemonic for subjunctive vowel changes across conjugations is "shE wEArs A tIAra": for second conjugation, that gives you -ea-.

• moneam, moneās, moneat, moneāmus, moneātis, moneant

Present passive subjunctive

Same -ea- stem change, but with passive endings:

• monear, moneāris, moneātur, moneāmur, moneāminī, moneantur

Imperfect Tense Forms

Imperfect active indicative

Insert the tense sign -bā- between the present stem and personal endings:

Translates as ongoing or repeated past action: "I was warning," "I used to warn."

Imperfect passive indicative

Same -bā- tense sign with passive endings:

• monēbar, monēbāris, monēbātur, monēbāmur, monēbāminī, monēbantur

Imperfect active subjunctive

Here's a handy shortcut: take the present active infinitive (monēre) and add personal endings directly to it.

• monērem, monērēs, monēret, monērēmus, monērētis, monērent

This trick works for all conjugations and makes the imperfect subjunctive one of the easiest forms to build.

Imperfect passive subjunctive

Same formation, but with passive endings:

• monērer, monērēris, monērētur, monērēmur, monērēminī, monērentur

Future Tense Forms

Future active indicative

Second conjugation forms the future with the tense sign -bi-/-bu-/-be- (just like first conjugation):

This is different from 3rd and 4th conjugation, which use -am, -ēs, -et... for the future. Don't mix them up.

Future passive indicative

Passive endings on the same future stem:

• monēbor, monēberis, monēbitur, monēbimur, monēbiminī, monēbuntur

Perfect System Forms

All perfect system forms work the same way regardless of conjugation. Once you have the perfect stem, the endings are identical for every Latin verb.

Perfect active indicative

Take the perfect stem (monu-) and add perfect endings:

Pluperfect active indicative

Perfect stem + -era- + personal endings:

• monueram, monuerās, monuerat, monuerāmus, monuerātis, monuerant

Translates as "I had warned," expressing an action completed before another past event.

Future perfect active indicative

Perfect stem + -eri- + personal endings (1st person singular uses -erō):

• monuerō, monueris, monuerit, monuerimus, monueritis, monuerint

Translates as "I will have warned."

Imperative Mood

Present active imperative

These are your direct commands:

• Singular: just the present stem → monē ("warn!")
• Plural: present stem + -te → monēte ("warn!" to multiple people)

For negative commands, use nōlī (sg.) or nōlīte (pl.) + the infinitive: nōlī monēre ("don't warn!").

Future active imperative

Less common, mostly found in legal or formal language:

• Singular: monētō ("you shall warn")
• Plural: monētōte ("you all shall warn")
• 3rd person: monentō ("they shall warn")

Common Second Conjugation Verbs

Some high-frequency verbs to memorize with their principal parts:

• habeō, habēre, habuī, habitus (to have)
• videō, vidēre, vīdī, vīsus (to see)
• moneō, monēre, monuī, monitus (to warn)
• doceō, docēre, docuī, doctus (to teach)
• teneō, tenēre, tenuī, tentus (to hold)
• timeō, timēre, timuī (to fear; no 4th principal part)

Deponent verbs

Some second conjugation verbs look passive but carry active meaning. These are deponent verbs. They only have passive forms, yet you translate them actively:

• polliceor, pollicērī, pollicitus sum (to promise)
• vereor, verērī, veritus sum (to fear)

Their principal parts end in -eor, -ērī, -itus sum.

Semi-deponent verbs

These verbs are active in the present system but switch to passive forms in the perfect system:

• audeō, audēre, ausus sum (to dare)
• gaudeō, gaudēre, gāvīsus sum (to rejoice)

So you'd say audeō ("I dare," active form) but ausus sum ("I dared," passive form with active meaning).

Second Conjugation vs. First Conjugation

Irregular Second Conjugation Verbs

Several of the most common second conjugation verbs have irregular perfect stems and participles. These simply need to be memorized:

The present system of these verbs is completely regular. It's only the perfect stem and participle that are unpredictable.

Translation Strategies

Identifying second conjugation verbs

1. Check the infinitive. If it ends in -ēre (long ē), it's second conjugation.
2. Look for the -ē- stem vowel running through present system forms.
3. In a dictionary, the entry will list the infinitive as the second principal part. That's your confirmation.

Context clues for tense and mood

• Temporal adverbs (nunc, tum, crās) help confirm which tense you're reading.
• Subjunctive triggers like ut, nē, cum (meaning "when/since/although"), and indirect questions signal that you should expect subjunctive forms.
• In complex sentences, check the sequence of tenses: a primary main verb takes primary subjunctive tenses in subordinate clauses, and a secondary (past) main verb takes secondary subjunctive tenses.