koi may have different meanings depending on context. When talking about people it may mean anybody/someone/anyone. when talking about things it may mean any/some. We are not done here,Look at few examples: Unka is mudde se koi sambhandh nahin hai. (he doesnt have any relation with this matter). (or he has NO relation with ....) koi nahin jaanta hai - NO ONE(koi nahin) knows. har koi jaanta hai - everyone knows. koi baat nahin - No matter/ doesnt matter. aisi koi baat nahin kahi gayi hai - There is NO SUCH thing(or topic or point) said. yahi koi 50 log - around 50 people. koi tulna nahin - no comparison. yah koi bhi kar sakta hai - anyone can do this. in informal conversation you can hear one liner 'koi nahin' - which means I disagree. Pattern that can be derived from above koi xyz nahin -no xyz koi nahin(for people) - no one har koi (for people) - everyone/all. This is all I can remember right now. I think this answer has more scope of improvement in terms of cases (or scope).

"Koi" = Anybody "Koi" tu mudad karey ! ( Anybody may help !) italki is your own Language platform , feel free to ask more Questions.

anybody