What is a perfect passive participle?
perfect passive participle (plural perfect passive participles) (grammar) A participle, prominent in some languages (e.g. Latin, Greek) but less common in English, describing something that happened to a noun (the subject) in the past.
How to do the perfect passive in Latin?
To form the perfect passive, pluperfect passive and future perfect passive tense change the '-m' ending of the supine to '-s' to form the past participle. Remember that a past participle must agree with the word it modifies in gender, number and case and it declines like 'bonus, -a, -um' .