[636]. (2.) The following have -ī in the ablative, but -um of consonant stems in the genitive plural, and no nominative or accusative neuter plural: inops ([535]), without means, vigil ([536]), wide-awake, memor ([537]), remembering, dēgener, degenerate, ūber ([537]), prolific, has Ab. -ī, twice -e, Ne. Pl. once -a (Acc.). Compounds of pēs, as, bipēs ([532]), two-legged, have a late and rare Ne. Pl. N. and Ac. -ia.
[THE NUMERAL ADJECTIVE.]
[637]. Of the cardinals, ūnus, duo, trēs, and the hundreds except centum are declined. The other cardinals are not declined.
[638]. ūnus, one, is declined as follows:
| Singular. | Plural. | |||||
|---|---|---|---|---|---|---|
| Masc. | Fem. | Neut. | Masc. | Fem. | Neut. | |
| Nom. | ūnus | ūna | ūnum | ūnī | ūnae | ūna |
| Gen. | ūnīus | ūnīus | ūnīus | ūnōrum | ūnārum | ūnōrum |
| Dat. | ūnī | ūnī | ūnī | ūnīs | ūnīs | ūnīs |
| Acc. | ūnum | ūnam | ūnum | ūnōs | ūnās | ūna |
| Abl. | ūnō | ūnā | ūnō | ūnīs | ūnīs | ūnīs |
| Voc. | ūne | |||||
In verse, the genitive singular is often ūnius.
[639]. duo, two, and trēs, three, are declined as follows:
| Masc. | Fem. | Neut. | Masc. & Fem. | Neut. | |
|---|---|---|---|---|---|
| Nom. | duo | duae | duo | trēs | tria |
| Gen. | duōrum | duārum | duōrum | trium | trium |
| Dat. | duōbus | duābus | duōbus | tribus | tribus |
| Acc. | duo or duōs | duās | duo | trēs or trīs | tria |
| Abl. | duōbus | duābus | duōbus | tribus | tribus |
[640]. In dramatic verse, du͡o, &c., is common. In the genitive plural, duo sometimes has duū̆m ([462]). ambō, both, is declined like duo, but has -ō in the nominative and accusative, and only ambōrum and ambārum in the genitive plural. For the forms duo, ambō, see [415]; duōbus, duābus, [464], [442].
[641]. Hundreds are declined like the plural of bonus ([613]): as, ducentī, ducentae, ducenta, two hundred, G. ducentōrum or ducentū̆m ([462]), &c.