[929.] (1 b.) The following verbs in -ere have a reduplicated perfect stem ([858]), and the perfect participle, when used, is -sus ([912]).
[930.] (a.) With the present stem in -o|e- ([829]).
| cadō, fall | cadere | cecidī | -cāsus |
Compounds have i for a in the present system: as, oc-cidō, oc-cidere, oc-cidī ([860]), oc-cāsus. Rarely e in the present and perfect systems (Enn., Lucr., Varr.): as, ac-cedere, ac-cedisset ([109]). For the perfect of re-cidō, see [861].
| caedō, fell, cut | caedere | cecīdī | caesus |
Compounds have ī for ae: as, ac-cīdō, ac-cīdere, ac-cīdī ([860]), ac-cīsus.
| parcō, spare | parcere | pepercī | —— |
pepercī, &c. (regularly in Cic., Caes., Hor., Ov., Mart.; Nep. once; also Plaut. twice, Ter. once). Old parsī, &c. (Plaut. 8, Cato, Ter., Nov., Nep., once each); once parcuit (Naev.). Compounds: com-perce (Plaut.), con-parsit (Ter.), in-perce, im-percitō, re-percis (Plaut.), re-parcent (Lucr.).
| pendō, weigh, pay | pendere | pependī | pēnsus |
[931.] (b.) With the present stem in a nasalized root followed by -o|e- ([831]).