You cannot explain aspect or voice or tense-- there is not enough context. It could be simple or perfect aspect, active or passive voice, simple past, or just an adjective. All you can say is that it is the -ed form of the verb.
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Justafreak... they most also certainly positioned..- the sentence is barely understandable, to be honest. Please correct and finish it - then it will be easier to help you.
Justafreak..it appears not to have been in his interest:- not to have been is a perfective a
JustafreakIn my grammarbook it is said that every verb-phrase consisting of several verbs, the first will always be finite and the rest non-finite.-