2430. Monosyllables ending in a vowel or a single consonant have the
vowel long: as,
#dōs#, #sōl#; #ā# for #ab#; #ē# for #ex# or #ec-#, #pēs# for #*peds#;
ablative #quā#, #quī#; #quīn# for #*quīne#; locative #sei#, commonly
#sī#; #sīc# (708); dative and ablative plural #quīs# (688).
Exceptions.
2431. The vowel is short in:
2432. (_a._) Monosyllables ending in #b#, #d#, #m#, and #t#: as, #ab#,
#ad#, #dum#, #dat#.
2433. (_b._) The indefinite #qua#, N. and Ac.; the enclitics #-que#
(rarely #-quē#), #-ne#, #-ve#, #-ce#; and in the words #cor#, #fel#,
#mel#; #os#, _bone_; #ac#, #vir#, #is#, #pol#, #quis# (N.); #fac#,
#fer#, #per#, #ter#; #an#, #bis#, #in#, #cis#; #nec#, #vel#. N. #hīc# is
rarely short (664). For the quantity of #es#, see 747.