of a Latin verb,--so called because they contain the different stems, from
which the full conjugation of the verb may be derived.

* * * * *

CONJUGATION OF SUM.

100. The irregular verb sum is so important for the conjugation of all
other verbs that its inflection is given at the outset.

PRINCIPAL PARTS.
PRES. IND. PRES. INF. PERF. IND. FUT. PARTIC.[29]
sum esse fuī futūrus


INDICATIVE MOOD.

PRESENT TENSE.
SINGULAR. PLURAL.
sum, _I am_, sumus, _we are_,
es, _thou art_, estis, _you are_,
est, _he is_; sunt, _they are_.

IMPERFECT.
eram, _I was_, erāmus, _we were_,
erās, _thou wast_, erātis, _you were_,
erat, _he was_; erant, _they were_.

FUTURE.
erō, _I shall be_, erimus, _we shall be_,