Declension table of ?sīvayiṣyat

Masculine	Singular	Dual	Plural
Nominative	sīvayiṣyan	sīvayiṣyantau	sīvayiṣyantaḥ
Vocative	sīvayiṣyan	sīvayiṣyantau	sīvayiṣyantaḥ
Accusative	sīvayiṣyantam	sīvayiṣyantau	sīvayiṣyataḥ
Instrumental	sīvayiṣyatā	sīvayiṣyadbhyām	sīvayiṣyadbhiḥ
Dative	sīvayiṣyate	sīvayiṣyadbhyām	sīvayiṣyadbhyaḥ
Ablative	sīvayiṣyataḥ	sīvayiṣyadbhyām	sīvayiṣyadbhyaḥ
Genitive	sīvayiṣyataḥ	sīvayiṣyatoḥ	sīvayiṣyatām
Locative	sīvayiṣyati	sīvayiṣyatoḥ	sīvayiṣyatsu

Compound sīvayiṣyat -

Adverb -sīvayiṣyantam