Declension table of ?methana

Neuter	Singular	Dual	Plural
Nominative	methanam	methane	methanāni
Vocative	methana	methane	methanāni
Accusative	methanam	methane	methanāni
Instrumental	methanena	methanābhyām	methanaiḥ
Dative	methanāya	methanābhyām	methanebhyaḥ
Ablative	methanāt	methanābhyām	methanebhyaḥ
Genitive	methanasya	methanayoḥ	methanānām
Locative	methane	methanayoḥ	methaneṣu

Compound methana -

Adverb -methanam -methanāt