@ghfpok,
What a horrible post.
https://en.wikipedia.org/wiki/Grammatical_conjugation
Declensions may apply to nouns, pronouns, adjectives, adverbs, and articles to indicate number (e.g., singular, dual, plural), case (e.g., nominative case, accusative case, genitive case, dative case), gender (e.g., masculine, neuter, feminine), and a number of other grammatical categories.
There, that wasn't so hard now, was it? Took me about 3 seconds.