I KNOW IT'S A LONG COMMENT BUT PLEASE READ IT. IT MIGHT HELP SOME OF YA'LL OUT. DIFFERENCE BETWEEN YA, ZA,LA E.T.C : 'Ya' &' La' are used if the "ngeli" of the word being talked about is li- ya. Za is used if the "ngeli " of the word talked about is i-zi or * u-zi*. They all mean the same thing- it's like [--'s] in English but can not be used on the same word because all words are categorized in a different "ngeli". For example, you can say "gari LA Juma ni kubwa" ( Juma's car is big) in singular but " magari YA Juma ni kubwa (Juma's cars are big) in plural. Another example is you can use the ngeli of li-ya for the word 'gari'( car) but can not use the same ngeli if talking about living things like people or animals. I hope you know what "ngeli" is cause I don't know how to translate it in English & I hope this helps you. I'm from Kenya so you can take my word for this. I just came here to earn xp not learn. I'm sure of my statement.