Declension table of ?tvacasya

Neuter	Singular	Dual	Plural
Nominative	tvacasyam	tvacasye	tvacasyāni
Vocative	tvacasya	tvacasye	tvacasyāni
Accusative	tvacasyam	tvacasye	tvacasyāni
Instrumental	tvacasyena	tvacasyābhyām	tvacasyaiḥ
Dative	tvacasyāya	tvacasyābhyām	tvacasyebhyaḥ
Ablative	tvacasyāt	tvacasyābhyām	tvacasyebhyaḥ
Genitive	tvacasyasya	tvacasyayoḥ	tvacasyānām
Locative	tvacasye	tvacasyayoḥ	tvacasyeṣu

Compound tvacasya -

Adverb -tvacasyam -tvacasyāt