Allen & Greenough · Part First — Words and Forms › Forms of Conjugation

§198. Irregular Verbs

Sum is compounded without any change of inflection with the prepositions ab, ad, dē, 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

	INDICATIVE		SUBJUNCTIVE
	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	----	----

	IMPERATIVE
PRESENT prōdes, prōdeste		FUTURE prōdestō, prōdestōte
	INFINITIVE
PRESENT prōdesse		PERFECT 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

	INDICATIVE		SUBJUNCTIVE
	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	----	----
INFINITIVE
PRES. posse	PERF. potuisse

PARTICIPLE

PRES. potēns (adjective), powerful

J. H. Allen and J. B. Greenough, New Latin Grammar (Boston: Ginn, 1903). Text provided under a CC BY-SA license by Perseus Digital Library, http://www.perseus.tufts.edu, with funding from the National Endowment for the Humanities.