Declension table of ?yāvayiṣyat

Masculine	Singular	Dual	Plural
Nominative	yāvayiṣyan	yāvayiṣyantau	yāvayiṣyantaḥ
Vocative	yāvayiṣyan	yāvayiṣyantau	yāvayiṣyantaḥ
Accusative	yāvayiṣyantam	yāvayiṣyantau	yāvayiṣyataḥ
Instrumental	yāvayiṣyatā	yāvayiṣyadbhyām	yāvayiṣyadbhiḥ
Dative	yāvayiṣyate	yāvayiṣyadbhyām	yāvayiṣyadbhyaḥ
Ablative	yāvayiṣyataḥ	yāvayiṣyadbhyām	yāvayiṣyadbhyaḥ
Genitive	yāvayiṣyataḥ	yāvayiṣyatoḥ	yāvayiṣyatām
Locative	yāvayiṣyati	yāvayiṣyatoḥ	yāvayiṣyatsu

Compound yāvayiṣyat -

Adverb -yāvayiṣyantam