The perfect forms of deponent verbs, like those of regular verbs, are formed from the third principal part. But in the case of deponent verbs these are periphrastic; that is, each verb form is made up of two separate words, a participle and a form of sum, as in vēnātus sum from vēnor. Conjugating periphrastic verbs in Latin is trickier than conjugating one-word verbs, because both parts inflect. The form of sum is conjugated as usual, while the participle changes as necessary to agree with the subject in gender and number.
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