Deponency and Tense
Some verbs are deponent universally, but other verbs are deponent only in certain tenses, or use deponent forms from different voices in different tenses. For example, the Greek verb ἀναβαίνω (anabaino) uses active forms in the imperfect active and aorist active, but in the future active it shows the middle form ἀναβήσομαι (anabesomai). The future active form might be predicted to be *ἀναβήσω (anabeso), but this form does not occur, because the verb is deponent in the future tense. The future forms that do occur have the same meaning and translation value that the active forms would have if they occurred.
Latin has a few semi-deponent verbs, which behave normally in the imperfect system, but are deponent in the perfect.
Read more about this topic: Deponent Verb
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