Anon; You are mixing terminologies. "Past subjunctive" is a formal grammatical term for the inflection of a verb. "Unreal past" is an informal description of the clause that says something that is untrue in the past.
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AnonymousThe verb in the 3rd conditional sentence that expresses "unreal past" has the form of the past subjunctive. Right? So, to express the "unreal condition" we use the past subjunctive form which is the past form of the verb, and the Past Perfect verb is no exception. Right?Well, that depends on how you wish to think of things.
Anonymouscan the 3rd conditional be called the past subjunctive INSTEAD of unreal past?No, but the verb tense in the if-clause can be called the past perfect subjunctive. ('Unreal past' is not really the name of a tense; it's a description of the usage.)