Rule 84: Circumstantial cum Clauses
The conjunction cum can introduce clauses that show the general circumstances surrounding an action. When it does so, we still can translate it as "when" (although "after" or "while" can sometimes work) and the verb in the clause is in the subjunctive mood, usually the imperfect or pluperfect. This video looks at the so-called circumstantial cum clause, and explores how this clause differs from a temporal cum clause, which takes its verb in the indicative mood.