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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

Singular Plural Singular Plural
PRESENT prōsum prōsumus prōsim prōsīmus
prōdes prōdestis prōsīs prōsītis
prōdest prōsunt prōsit prōsint
IMPERFECT prōderam prōderāmus prōdessem prōdessēmus
FUTURE prōderō prōderimus ---- ----
PERFECT prōfuī prōfuimus prōfuerim prōfuerimus
PLUPERFECT prōfueram prōfuerāmus prōfuissem prōfuissēmus
FUT. PERF. prōfuerō prōfuerimus ---- ----

PRESENT prōdes, prōdeste FUTURE prōdestō, prōdestōte
PRESENT prōdesse PERFECT prōfuisse
FUTURE prōfutūrus esse
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

Singular Plural Singular Plural
PRESENT possum possumus possim possīmus
potes potestis possīs possītis
potest possunt possit possint
IMPERFECT poteram poterāmus possem possēmus
FUTURE poterō poterimus ---- ----
PERFECT potuī potuimus potuerim potuerimus
PLUPERFECT potueram potuerāmus potuissem potuissēmus
FUT. PERF. potuerō potuerimus ---- ----
PRES. posse PERF. potuisse


  1. PRES. potēns (adjective), powerful

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.

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