630. Adjectives ‘of two endings’ with stems in #-i-# are declined as
follows:
+--------+-------------------------------------------+
| Example| M. and F. brevis, Ne. breve, _short_ |
| Stem | brevi-. |
+--------+------------------+------------------------+
| | Singular. | Plural. |
| +------------------+------------------------+
| | MASC. NEUT. | MASC. NEUT. |
| | AND FEM. | AND FEM. |
| +------------------+------------------------+
| _Nom._ | brevis breve | brevēs brevia |
| _Gen._ | brevis brevis | brevium brevium |
| _Dat._ | brevī brevī | brevibus brevibus |
| _Acc._ | brevem breve | brevīs, -ēs brevia |
| _Abl._ | brevī brevī | brevibus brevibus |
+--------+------------------+------------------------+
631. The ablative is sometimes #-e# when these adjectives are used
substantively or in verse (558). The genitive plural is rarely #-um# for
#-ium# (563).