Esse
 
 
The auxiliary esse to be has suppletive forms, cf.:
Present 
Indicative
Imperfect 
Indicative
Future 
Indicative
Perfect 
Indicative
sum
es
est
sumus
estis
sunt
eram
eras
erat
eramus
eratis
erant
ero
eris
erit
erimus
eritis
erunt
fui
fuisti
fuit
fuimus
fuistis
fuerunt
Pluperfect 
Indicative
Future Perfect
Indicative
Present 
Subjunctive
Present Subjunctive
(suppletive older forms)
fueram
fueras
fuerat
fueramus
fueratis
fuerant
fuero
fueris
fuerit
fuerimus
fueritis
fuerint
sim
sis
sit
simus
sitis
sint
fuam,
fuas
fuat
--
--
fuant.
Imperfect
Subjunctive
Perfect 
Subjunctive
Pluperfect
Subjunctive
Present 
Infinitive
essem
esses
esset
essemus
essetis
essent
fuerim
fueris
fuerit
fuerimus
fueritis
fuerint
fuissem
fuisses
fuisset
fuissemus
fuissetis
fuissent
esse
Perfect 
Infinitive
fuisse
Present 
Imperative
Future 
Imperative
Present 
Participle
Future 
Infinitive
--
es!
--
--
este!
--
--
esto
esto
--
estote
sunto
ens, entis futurus, a, um esse
fore (older form)
Future Participle
Basic forms
futurus, 3
sum, fui, futurus, esse
 
 
List of Derivatives:
 
absum, abfui, abesse be away, be absent
adsum, adfui, adesse be present
desum, defui, deesse be wanting, lack
insum, --, inesse be there, be in
intersum, interfui, interesse be in the midst, be present
obsum, obfui, obesse be a nuisance to, tell against
possum, potui, posse be able, can
The verb posse is derived from the adjective potis (pot-) powerful, mighty and the stems of esse; the forms developed by assimilatian and simplifications, cf.:
possum < pot|sum, 
potui <*pot|fui
posse < *pot|esse.
praesum, praefui, praeesse be at the head of; be present
prosum, profui, prodesse be useful
The verb prosum is formed with the prefix pro-, which appears in its older form prod- before all forms of esse, beginning with a vowel, cf.
pres. ind. podes, podest, podestis;
impf. ind. poderam, poderas etc.;
fut. ind. podero, poderis etc.
subsum, --, subesse be underneath
supersum, superfui, superesse be left over, be in excess, survive


Irregular Verbs
Descriptive Latin Grammar

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