It’s always easy to understand the general trend of Sanskrit declensions of nouns based on their ending, which usually depicts whether it’s a masculine, feminine or a have a neuter gender. Once you understand that, you can quickly deduce the declensions on your own given that you know the flow for a particular ending.
Here, we provide the declensions according to various cases for the noun देव
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| Case | Singular | Dual | Plural |
| I (Subject) | देवः (Devaḥ) | देवौ (Devau) | देवाः (Devāḥ) |
| II (To, Object) | देवम् (Devam) | देवौ (Devau) | देवान् (Devān) |
| III (With, By) | देवेण (Deveṇa) | देवाभ्याम् (Devābhyām) | देवैः (Devaiḥ) |
| IV (For) | देवाय (Devāya) | देवाभ्याम् (Devābhyām) | देवेभ्यः (Devebhyaḥ) |
| V (From, Than) | देवात् (Devāt) | देवाभ्याम् (Devābhyām) | देवेभ्यः (Devebhyaḥ) |
| VI (Of) | देवस्य (Devasya) | देवयोः (Devayoḥ) | देवानाम् (Devānām) |
| VII (In, On) | देवे (Deve) | देवयोः (Devayoḥ) | देवेषु (Deveṣu) |
| Vocative | हे देव (He Deva) | हे देवौ (He Devau) | हे देवाः (Devāḥ) |
