I have looked for some references regarding how to say "where else", "who else", and "what else" but I still can't find one that's dependable enough. Furthermore, it seems like there are quite a lot of ways to express "where else", "who else", "what else".
Here are some example sentences I found on the internet which contain "where else", "who else", and "what else" when translated. I'm sorry that instead of coming with statements, I come with examples. It's because I couldn't find a source that states how to form "where/who/what else. Idk if these sentences are correct though :
Next, from the sentences above, it seems like when you place 还/别的/其他 or any other words that mean "else" and any question words like 什么，谁，and 哪里 together, you can already form "question word (like where/who/what) + else". I don't know if my assumption is correct though. Please kindly tell me if my assumption is incorrect.
If forming "question word + else" really goes the way I assume it, why is there double else "还&其他" in the 8th sentence? Is it okay to place two "else"s here?
Then, why do some of them contain "有" or "在" and some others not? Is it necessary to add "有/在" when one wants to express "(where/who/what else)? If yes, what do both characters mean/indicate here? And will there be any difference if you choose one over the other?