Declension table of ?pūrvastha

Neuter	Singular	Dual	Plural
Nominative	pūrvastham	pūrvasthe	pūrvasthāni
Vocative	pūrvastha	pūrvasthe	pūrvasthāni
Accusative	pūrvastham	pūrvasthe	pūrvasthāni
Instrumental	pūrvasthena	pūrvasthābhyām	pūrvasthaiḥ
Dative	pūrvasthāya	pūrvasthābhyām	pūrvasthebhyaḥ
Ablative	pūrvasthāt	pūrvasthābhyām	pūrvasthebhyaḥ
Genitive	pūrvasthasya	pūrvasthayoḥ	pūrvasthānām
Locative	pūrvasthe	pūrvasthayoḥ	pūrvastheṣu

Compound pūrvastha -

Adverb -pūrvastham -pūrvasthāt