Cicero's "Ad Atticum" 3.19.3 Letter to Atticus
Do you remember the PLUPERFECT SUBJUNCTIVE?
the whole 3rd principal part + SSE + personal ending
AMO, AMARE, AMAVI, AMATUS
How you translate a subjunctive, as always, depends on the kind of clause in which you find it. But often, like in a Purpose Clause, it is just translated as an indicative verb, so "had VERBed:.