The –io verbs

(The circunflected accents are used to mark long vowels.)
 
 
There are 15 verbs with short thematic vowel –i- which in their conjugational pattern are intermediary between the verbs of the III and IV conjugations; grammatically they are classified to the III conjugation because they always change the short –i- to –e- before r and thus form infinitives in –ere (like legere and the other verbs of the III conjugation). These verbs are:
  1. allicio, allexi, allectus, allicere to attract, to entice
  2. aspicio, aspexi, aspectus, aspicere to look on / at, to behold
  3. capio, cepi, captus, capere to seize, to capture
  4. cupio, cupivi, cupitus, cupere to long for, to covet
  5. facio, feci, factus, facere to do
  6. fodio, fodi, fossus, fodere to dig (out)
  7. fugio, fugi, fugiturus, fugere to flee, to run away
  8. gradior, gressus sum, gradi to walk, to go, to advance
  9. jacio, jeci, jactus, jacere to throw
  10. morior, mortuus sum, mori to die
  11. pario, peperi, partus, parere to give birth to
  12. patior, passus sum, pati to suffer, to undergo
  13. quatio, --, quassus, quatere to shake
  14. rapio, rapui, raptus, rapere to drag off, to snatch
  15. sapio, sapii, --, sapere to have sense, to understand, to taste of
An example verb:
 
Capere
Indicative
 
Subjunctive
Active Voice
Passive Voice
Active Voice
Passive Voice
Present Sg. 1.
2.
3.
capio
capis
capit
capior
caperis
capitur
capiam
capias
capiat
capiar
capiaris
capiatur
Pl. 1.
2.
3.
capimus
capitis
capiunt
capimur
capimini
capiuntur
capiâmus
capiâtis
capiant
capiamur
capiamini
capiantur
Imperfect Sg. 1.
2.
3.
capiêbam
capiêbas
capiêbat
capiêbar
capiebâris
capiebâtur
caperem
caperes
caperet
caperer
caperêris
caperêtur
Pl. 1.
2.
3.
capiebâmus
capiebâtis
capiêbant
capiebâmur
capiebamini
capiebantur
caperêmus
caperêtis
caperent
caperêmur
caperemini
caperentur
Future Sg. 1.
2.
3.
capiam
capies
capiet
capiar
capiêris
capiêtur
--
--
--
--
--
--
Pl. 1.
2.
3.
capiêmus
capiêtis
capient
capiêmur
capiemini
capientur
--
--
--
--
--
--
Perfect     cepi … captus sum … ceperim … captus sim …
Pluperfect     ceperam … captus eram … cepissem … captus essem …
Fut. Perfect     cepero … captus ero …
--
--
 
Imperative
Infinitive
Present Sg. 2. cape capere capere capi
Pl. 2. capite capimini
Future Sg. 2.
3.
capito
capito
capitor
capitor
captûrus esse captum iri
Pl. 2.
3.
capitôte
capiunto
--
capiunto
Perfect    
--
--
capisse captus esse
 
Participle
Gerund
Present capiens, -entis
--
capiendi, o, um, o
Future captûrus, 3 capiendus, 3
Supine
Perfect
--
captus, 3
captum, u


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