Declension table of ?tavasya

Neuter	Singular	Dual	Plural
Nominative	tavasyam	tavasye	tavasyāni
Vocative	tavasya	tavasye	tavasyāni
Accusative	tavasyam	tavasye	tavasyāni
Instrumental	tavasyena	tavasyābhyām	tavasyaiḥ
Dative	tavasyāya	tavasyābhyām	tavasyebhyaḥ
Ablative	tavasyāt	tavasyābhyām	tavasyebhyaḥ
Genitive	tavasyasya	tavasyayoḥ	tavasyānām
Locative	tavasye	tavasyayoḥ	tavasyeṣu

Compound tavasya -

Adverb -tavasyam -tavasyāt