Declension table of ?amastu

Masculine	Singular	Dual	Plural
Nominative	amastuḥ	amastū	amastavaḥ
Vocative	amasto	amastū	amastavaḥ
Accusative	amastum	amastū	amastūn
Instrumental	amastunā	amastubhyām	amastubhiḥ
Dative	amastave	amastubhyām	amastubhyaḥ
Ablative	amastoḥ	amastubhyām	amastubhyaḥ
Genitive	amastoḥ	amastvoḥ	amastūnām
Locative	amastau	amastvoḥ	amastuṣu

Compound amastu -

Adverb -amastu