Declension table of pratna

Neuter	Singular	Dual	Plural
Nominative	pratnam	pratne	pratnāni
Vocative	pratna	pratne	pratnāni
Accusative	pratnam	pratne	pratnāni
Instrumental	pratnena	pratnābhyām	pratnaiḥ
Dative	pratnāya	pratnābhyām	pratnebhyaḥ
Ablative	pratnāt	pratnābhyām	pratnebhyaḥ
Genitive	pratnasya	pratnayoḥ	pratnānām
Locative	pratne	pratnayoḥ	pratneṣu

Compound pratna -

Adverb -pratnam -pratnāt