The verbs in the third conjugation have second principal parts that end in -ere.

The present passive infinitive form of third conjugation verbs end in -ī.

There are two different types of third conjugation verbs, ones that end in -ō in the first principal part and ones that end in -iō.

 

mittō, mittere, mīsī, misus (to send)

present passive infinitive: mittī (to be sent)

(Active)Present ImperfectFuturePerfectPluperfectFuture Perfect
Sing. 1stmittōmittēbammittammīsīmīserammīserō
Sing. 2ndmittismittēbāsmittēsmīsistīmīserāsmīseris
Sing. 3rdmittitmittēbatmittetmīsitmīseratmīserit
Plu. 1stmittimusmittēbāmusmittēmusmīsimusmīserāmusmīserimus
Plu. 2ndmittitismittēbātismittētismīsistismīserātismīseritis
Plu. 3rdmittuntmittēbantmittentmīsēruntmīserantmīserint
(Passive)Present ImperfectFuture
Sing. 1stmittormittēbarmittar
Sing. 2ndmitterismittēbārismittēris
Sing. 3rdmittiturmittēbāturmittētur
Plu. 1stmittimurmittēbāmurmittēmur
Plu. 2ndmittiminīmittēbāminīmittēminī
Plu. 3rdmittunturmittēbanturmittentur

capiō, capere, cēpī, captus (to capture)

perfect passive infinitive: capī (to be captured)

(Active)Present ImperfectFuturePerfectPluperfectFuture Perfect
Sing. 1stcapiōcapiēbamcapiamcēpīcēperamcēperō
Sing. 2ndcapiscapiēbāscapiēscēpistīcēperāscēperis
Sing. 3rdcapitcapiēbatcapietcēpitcēperatcēperit
Plu. 1stcapimuscapiēbāmuscapiēmuscēpimuscēperāmuscēperimus
Plu. 2ndcapitiscapiēbātiscapiētiscēpistiscēperātiscēperitis
Plu. 3rdcapiuntcapiēbantcapientcēpēruntcēperantcēperint
(Passive)Present ImperfectFuture
Sing. 1stcapiorcapiēbarcapiar
Sing. 2ndcaperiscapiēbāriscapiēris
Sing. 3rdcapiturcapiēbāturcapiētur
Plu. 1stcapimurcapiēbāmurcapiēmur
Plu. 2ndcapiminīcapiēbāminīcapiēminī
Plu. 3rdcapiunturcapiēbanturcapientur