Pluperfect Subjunctive (Active)
The pluperfect subjunctive is only used in a couple of subordinate clauses at GCSE: Indirect Questions and cum Clauses. It is translated just like the indicative pluperfect tense, i.e. using the auxillary verb had.
|cum Clause||portavissem||I had carried|
|Indirect Question||portavissem||I had carried|
The pluperfect subjunctive uses the perfect infinitive as the stem, e.g. portavisse-, and the standard active personal endings: -m, -s, -t, -mus, -tis, -nt.