§167. Verb-Endings
A long vowel is shortened before the personal endings -m (-r), -t, -nt (-ntur): as, ame-t (for older amē-t), habe-t (for habē-t), mone-nt, mone-ntur.
J. H. Allen and J. B. Greenough, New Latin Grammar (Boston: Ginn, 1903). Text provided under a CC BY-SA license by Perseus Digital Library, http://www.perseus.tufts.edu, with funding from the National Endowment for the Humanities.