Declension table of ?yathākartavya

Masculine	Singular	Dual	Plural
Nominative	yathākartavyaḥ	yathākartavyau	yathākartavyāḥ
Vocative	yathākartavya	yathākartavyau	yathākartavyāḥ
Accusative	yathākartavyam	yathākartavyau	yathākartavyān
Instrumental	yathākartavyena	yathākartavyābhyām	yathākartavyaiḥ yathākartavyebhiḥ
Dative	yathākartavyāya	yathākartavyābhyām	yathākartavyebhyaḥ
Ablative	yathākartavyāt	yathākartavyābhyām	yathākartavyebhyaḥ
Genitive	yathākartavyasya	yathākartavyayoḥ	yathākartavyānām
Locative	yathākartavye	yathākartavyayoḥ	yathākartavyeṣu

Compound yathākartavya -

Adverb -yathākartavyam -yathākartavyāt