841. The suffix of the present subjunctive of #sum#, _am_, is #-ī-#,
which becomes #-i-# before #-m#, #-t#, and #-nt#: #si-m#, #sī-s#,
#si-t#, #sī-mus#, #sī-tis#, #si-nt# (35, 2, 3). So also in the singular
and in the third person plural, #dui-m#, &c. (756), and #edi-m#, &c.
(769), and in all the persons, #veli-m#, &c. (#nōli-m#, &c., #māli-m#,
&c.). An old suffix is #-iē-# (#-ie-#), in #sie-m#, #siē-s#, #sie-t#,
and #sie-nt#.
842. (1.) The present subjunctive stem of verbs in #-ere#, #-ēre#, and
#-īre#, ends in #-ā-#, which becomes #-a-# in some of the persons; this
suffix replaces the variable vowel of the indicative: as,
#rega-m#, #regā-s#, #rega-t#, #regā-mus#, #regā-tis#, #rega-nt#;
#capia-m#, #capiā-s#, &c.; #monea-m#, #moneā-s#, &c.; #audia-m#,
#audiā-s#, &c. #ea-m#, #quea-m#, #fera-m#, and the old #fua-m# (750),
also have the formative subjunctive vowel.
843. (2.) The present subjunctive stem of verbs in #-āre# ends in #-ē-#,
which becomes #-e-# in some of the persons: as,
#laude-m#, #laudē-s#, #laude-t#, #laudē-mus#, #laudē-tis#, #laude-nt#.
#dō#, _give_, also has #de-m#, #dē-s#, &c.
[Erratum:
842 ... #monea-m#, #moneā-s#, &c.;
. missing]