MASCULINE FEMININE NEUTER SINGULAR NOM. certus certa certum GEN. certi certae certi DAT. certo certae certo ACC. certum certam certum ABL. certo certa certo PLURAL NOM. certi certae certa GEN. certorum certarum certorum DAT. certis certis certis ACC. certos certas certa ABL. certis certis certis