PERFECT ACTIVE
-4th principal part of the verb + sum, es, est, sumus, estis, sunt
PLUPERFECT ACTIVE
--4th principal part of the verb + eram, eras, erat, eramus, eratis, errant
FUTURE PERFECT ACTIVE
--4th principal part of the verb + ero, eris, erit, erimus, eritis, erint
PARTICIPLES ("fruor")
Present=stem + -ans, -ens, -iens
____ing
Perfect=4th p.p.
having ____ed
Future=4th p.p + -ur- (comes right in front of -us)
about to ____