Declension table of ?amastu

Neuter	Singular	Dual	Plural
Nominative	amastu	amastunī	amastūni
Vocative	amastu	amastunī	amastūni
Accusative	amastu	amastunī	amastūni
Instrumental	amastunā	amastubhyām	amastubhiḥ
Dative	amastune	amastubhyām	amastubhyaḥ
Ablative	amastunaḥ	amastubhyām	amastubhyaḥ
Genitive	amastunaḥ	amastunoḥ	amastūnām
Locative	amastuni	amastunoḥ	amastuṣu

Compound amastu -

Adverb -amastu