Ka, Ki, Ke: The Word for Belonging
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Hindi possessives change form to agree with the gender and number of the thing possessed, not the possessor, a detail that often surprises English speaking learners at first. Uska ghar, his or her house, uses ka because ghar is masculine. If the possessed item were feminine instead, kitab, book, the same sentence would use ki: uski kitab, his or her book.
This agreement pattern applies consistently across का (ka), की (ki) and के (ke) depending on gender and number. Learners should practise possessives with a range of nouns of different genders, rather than fixing the form to the possessor. Once the logic clicks, ka, ki and ke become one of the more satisfying, systematic parts of Hindi grammar.
A useful exercise is describing several different possessions belonging to the same person, noticing how ka, ki and ke shift depending only on what is owned, never on who owns it. Repeating this exercise with a mix of masculine, feminine and plural nouns helps the underlying logic settle in more securely than studying the rule in isolation.