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Allen and Greenough/ New Latin Grammar

IRREGULAR VERBS

198. Sum is compounded without any change of inflection with the prepositions ab, ad, , in, inter, ob, prae, prō (earlier form prōd ), sub, super.

a. In the compound prōsum (help), prō retains its original d before e:

PRINCIPAL PARTS: prōsum, prōdesse, prōfuī, prōfutūrus

INDICATIVESUBJUNCTIVE
SingularPluralSingularPlural
PRESENTprōsumprōsumusprōsimprōsīmus
prōdesprōdestisprōsīsprōsītis
prōdestprōsuntprōsitprōsint
IMPERFECTprōderamprōderāmusprōdessemprōdessēmus
FUTUREprōderōprōderimus--------
PERFECTprōfuīprōfuimusprōfuerimprōfuerimus
PLUPERFECTprōfueramprōfuerāmusprōfuissemprōfuissēmus
FUT. PERF.prōfuerōprōfuerimus--------
IMPERATIVE
PRESENT prōdes , prōdesteFUTURE prōdestō , prōdestōte
INFINITIVE
PRESENT prōdessePERFECT prōfuisse
FUTURE prōfutūrus esse
PARTICIPLE
FUTURE prōfutūrus

b. Sum is also compounded with the adjective potis, or pote, able , making the verb possum (be able, can). Possum is inflected as follows:—1

PRINCIPAL PARTS: possum, posse, potuī 2

INDICATIVESUBJUNCTIVE
SingularPluralSingularPlural
PRESENTpossumpossumuspossimpossīmus
potespotestispossīspossītis
potestpossuntpossitpossint
IMPERFECTpoterampoterāmuspossempossēmus
FUTUREpoterōpoterimus--------
PERFECTpotuīpotuimuspotuerimpotuerimus
PLUPERFECTpotuerampotuerāmuspotuissempotuissēmus
FUT. PERF.potuerōpotuerimus--------
INFINITIVE
PRES. possePERF. potuisse

PARTICIPLE

PRES. potēns (adjective), powerful

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Notes
1
The forms potis sum , pote sum , etc. occur in early writers. Other early forms are potesse ; possiem , -ēs , -et ; poterint , potisit (for possit ); potestur and possitur (used with a passive infinitive, cf. § 205 . a ).
2
Potuī is from an obsolete † potēre .