The present tense is used far more frequently in Latin than it is in English (at least in literary prose) as a lively representation of the past; this is called the HISTORICAL PRESENT:
DUM clauses: "while" uses the INDICATIVE:
Dum haec in colloquio geruntur, Caesari nuntiatum est . (Caesar Bellum Gallcum I. 46.1)
Conjunctions which are used to indicate 'contemporaneous action' in Latin are: dum, donec ('while, so long as, until), quoad ('up to the time that'), quamdiu ('as long as') and cum ('when')
Vita, dum superest, bene est.
Fuit haec gens fortis, dum Lycurgi leges vigebant.
Exspectabo dum venit.
DUMMODO clauses: 'dummodo proviso' 'provided that' uses the SUBJUNCTIVE:
Oderint dum metuant. (Accius, quoted in Cicero de officiis I. 28.97)
John Paul Adams, CSUN