Declension table of ?tapasyiṣyat

Masculine	Singular	Dual	Plural
Nominative	tapasyiṣyan	tapasyiṣyantau	tapasyiṣyantaḥ
Vocative	tapasyiṣyan	tapasyiṣyantau	tapasyiṣyantaḥ
Accusative	tapasyiṣyantam	tapasyiṣyantau	tapasyiṣyataḥ
Instrumental	tapasyiṣyatā	tapasyiṣyadbhyām	tapasyiṣyadbhiḥ
Dative	tapasyiṣyate	tapasyiṣyadbhyām	tapasyiṣyadbhyaḥ
Ablative	tapasyiṣyataḥ	tapasyiṣyadbhyām	tapasyiṣyadbhyaḥ
Genitive	tapasyiṣyataḥ	tapasyiṣyatoḥ	tapasyiṣyatām
Locative	tapasyiṣyati	tapasyiṣyatoḥ	tapasyiṣyatsu

Compound tapasyiṣyat -

Adverb -tapasyiṣyantam