s in many forms directly to the stem,
instead of employing a connecting vowel, as fer-s (2d Sing. of fer-o),
instead of fer-i-s. They are but the relics of what was once in Latin a
large class of Verbs.

125. The Inflection of sum has already been given. Its various compounds
are inflected in the same way. They are--

absum abesse afui _am absent_
_Pres. Partic_. absens (absentis), _absent_.
adsum adesse adfui _am present_
desum deesse defui _am lacking_
insum inesse infui _am in_
intersum interesse interfui _am among_
praesum praeesse praefui _am in charge of_
_Pres. Partic_. praesens (praesentis), _present_
obsum obesse obfui _hinder_
prosum prodesse profui _am of advantage_
subsum subesse subfui _am underneath_
supersum superesse superfui _am left_

NOTE.--Prosum is compounded of prod (earlier form of pro) and sum; the d
disappears before consonants, as prosumus; but prodestis.

126. Possum. In its Present System possum is a compound of pot- (for pote,
able) and sum; potui is from an obsolete potere.

PRINCIPAL PARTS.
possum, posse, potui, _to be
able_.

INDICATIVE MOOD.
SINGULAR. PLURAL.
_Pres._ possum, potes, potest; possumus, potestis, possunt.
_Imp._ poteram; poteramus.
_Fut._ potero; poterimus.
_Perf._ potui; potuimus.
_Plup._ potueram; potueramus.
_Fut. P._ potuero; potuerimus.

SUBJUNCTIVE.
SINGULAR. PLURAL.
_Pres._ possim, possis, possit; possimus, possitis, possint.
_Imp._ possem; possemus.
_Perf._ potuerim; potuerimus.
_Plup._ potuissem; potuissemus.

INFINITIVE. PARTICIPLE.
_Pres._ posse. _Pres._ potens (_as an adjective_).
_Perf._ potuisse.

127. Do, _I give_.

PRINCIPAL PARTS.
do, dare, dedi, da