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Allen and Greenough/ New Latin Grammar

VERBS IN -iō OF THE THIRD CONJUGATION

188. Verbs of the Third Conjugation in -iō have certain forms of the present stem like the fourth conjugation. They lose the i of the stem before a consonant and also before ĭ , ī , and ĕ (except in the future, the participle, the gerund, and the gerundive).1 Verbs of this class are conjugated as follows:—

PRINCIPAL PARTS: Active, capiō, capĕre, cēpī, captum; Passive, capior, capī, captus sum.

PRESENT STEM capie- (cape-) PERFECT STEM cēp-SUPINE STEM capt-
ACTIVE VOICEPASSIVE VOICE
INDICATIVESUBJUNCTIVEINDICATIVESUBJUNCTIVE
PRESENTPRESENT
cap, I takecapiamcap iorcapiar
capis, you takecapiās caperis (-re) capiāris (-re)
capit, he takescapiatcapiturcapiātur
capimuscapiāmuscapimurcapiāmur
capitiscapiātiscapiminīcapiāminī
capiuntcapiantcapiunturcapiantur
IMPERFECTIMPERFECT
capiēbamcaperemcapiēbarcaperer
FUTUREFUTURE
capiamcapiar
capiēs capiēris (-re)
capiet, etc.capiētur, etc.
PERFECTPERFECT
cēpīcēperimcaptus sum captus sim
PLUPERFECTPLUPERFECT
cēperamcēpissemcaptus eramcaptus essem
FUTURE PERFECTFUTURE PERFECT
cēperōcaptus erō
Active VoicePassive Voice
IMPERATIVE
PRESENTPRESENT
SingularPluralSingularPlural
capecapitecaperecapimini
FUTUREFUTURE
capitōcapitōtecapitor------
capitōcapiuntocapitor capiuntor
INFINITIVE
PRESENTcaperecapī
PERFECTcēpissecaptus esse
FUTUREcaptūrus essecaptum īrī
PARTICIPLES
PRESENTcapiēns, -ientisPERFECTcaptus, -a, -um
FUTUREcaptūrus, -a, -umGERUNDIVEcapiendus, -a, -um
GERUNDSUPINE
 capiendī, -dō, -dum, -dōcaptum, -tū

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Notes
1
This is a practical working rule. The actual explanation of the forms of such verbs is not fully understood.