A Latin Grammar for Schools and Colleges

by George Martin Lane

[2451.] Final syllables in is and us have the vowel short; those in as, es, and os, have the vowel long: as,

([a.]) N. lapis, fīnis; G. lapidis, fīnis; magis. Indic. Pres. regis ([826]); Fut. eris ([851], [826]), eritis, locābis ([853], [826]), locābitis.

([b.]) N. dominus; currus; N. and Ac. tempus; prius; rēgibus; īmus; regimus.

([c.]) aetās; Pl. Ac. mēnsās ([424]). Indic. Pres. locās ([840]); Imp. erās ([848]); regēbās ([847]); Plup. rēxerās ([880]); Subj. Pres. regās, vestiās, doceās ([842]).

([d.]) N. hērēs; sēdēs; nūbēs; Cerēs; fidēs; Pl. N. and Ac. rēgēs ([424]); Indic. Pres. docēs ([840]); Fut. regēs ([852]); Subj. Pres. siēs ([841]); locēs ([843]); Imp. essēs ([850]); regerēs ([849]); Plup. rēxissēs ([881]).

([e.]) N. custōs; arbōs; Pl. Ac. ventōs ([424]).

Exceptions in is.

[2452.] (a.) Final is has ī in all plural cases: as,

N. and Ac. omnīs; D. and Ab. viīs, locīs ([108, a]), vōbīs. Also in the nominatives singular Quirīs and Samnīs, usually in sanguī̆s ([486]), and twice in pulvī̆s.

[2453.] (b.) Final is has ī in the second person singular of verbs in -īre, in māvīs, in compounds of sīs, and in all present subjunctives singular: as, duīs, edīs, velīs, mālīs, nōlīs. For -rī̆s of the perfect subjunctive and the future perfect, see [877], [878], [883], [884].