Latin Fourth Conjugation Paradigm

Principal parts for scire, to know:

scio, scire, scivi, scitus.

Infinitives

Present Perfect Future
Active Voice scire scivisse sciturus esse
Passive Voice sciri scitus esse scitum iri

Participles

Present Perfect Future
Active Voice sciens ----- sciturus
Passive Voice ----- scitus sciendus

Indicative Mood

Active Voice

Present Tense Imperfect Tense Future Tense
Singular Plural
1 scio scimus
2 scis scitis
3 scit sciunt
Singular Plural
1 sciebam sciebamus
2 sciebas sciebatis
3 sciebat sciebant
Singular Plural
1 sciam sciemus
2 scies scietis
3 sciet scient
Perfect Tense Pluperfect Tense Future Perfect Tense
Singular Plural
1 scivi scivimus
2 scivisti scivistis
3 scivit sciverunt
Singular Plural
1 sciveram sciveramus
2 sciveras sciveratis
3 sciverat sciverant
Singular Plural
1 scivero sciverimus
2 sciveris sciveritis
3 sciverit sciverint

Passive Voice

Present Tense Imperfect Tense Future Tense
Singular Plural
1 scior scimur
2 sciris scimini
3 scitur sciuntur
Singular Plural
1 sciebar sciebamur
2 sciebaris sciebamini
3 sciebatur sciebantur
Singular Plural
1 sciar sciemur
2 scieris sciemini
3 scietur scientur

The perfect passives of scire are formed from the passive participle and the present, past or future tense of esse.

Perfect passive: scitus sum
Pluperfect passive: scitus eram
Future perfect passive: scitus ero

The ending -unt in the perfect active (3 pl) and the ending -is in the present, past and future passive (2 sing) are sometimes contracted to -e.

Subjunctive Mood

Active Voice

Present Tense Imperfect Tense
Singular Plural
1 sciam sciamus
2 scias sciatis
3 sciat sciant
Singular Plural
1 scirem sciremus
2 scires sciretis
3 sciret scirent
Perfect Tense Pluperfect Tense
Singular Plural
1 sciverim sciverimus
2 sciveris sciveritis
3 sciverit sciverint
Singular Plural
1 scivissem scivissemus
2 scivisses scivissetis
3 scivisset scivissent

Passive Voice

Present Tense Imperfect Tense
Singular Plural
1 sciar sciamur
2 sciaris sciamini
3 sciatur sciantur
Singular Plural
1 scirer sciremur
2 scireris sciremini
3 sciretur scirentur

The perfect passive subjunctives of scire are formed from the passive participle and the present or past subjunctive of esse.

Perfect passive subjunctive: scitus sim
Pluperfect passive subjunctive: scitus essem

The ending -is in the present and past passive subjunctive (2 sing) is sometimes contracted to -e.

Imperative Mood

Active Voice

Present Tense Future Tense
Singular Plural
2 sci scite
3 ----- -----
Singular Plural
2 scito scitote
3 scito sciunto

Passive Voice

Present Tense Future Tense
Singular Plural
2 scire scimini
3 ----- -----
Singular Plural
2 scitor -----
3 scitor sciuntor

Gerund and Supine

Genitive Dative Accusative Ablative
Gerund sciendi sciendo sciendum sciendo
Supine ----- ----- scitum scitu

Mail comments to Eric Conrad (econrad@math.ohio-state.edu).
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Last updated: Thu Jan 22 11:08:30 EST 1998. Typo correction: subjunctive `sciatis' was listed incorrectly as `scietis'. (Thanks to Marcella for pointing me to it!)