何か・誰か・どこか
something, someone, somewhere
Question word + か
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Add か to a question word and it becomes an indefinite "some-" word:
- 何か (なにか): something
- 誰か: someone
- どこか: somewhere
- いつか: someday
何か飲みますか is "would you like something to drink?", a yes/no question, where 何を飲みますか is "what will you drink?", asking for the drink itself.
が and を usually drop after these words (何か食べる, not 何かを食べる, though both occur); other particles stay: どこかへ行く, 誰かに聞く.
The answer to a 何か question is はい or いいえ first, then the detail: はい、お茶をお願いします.
Examples
何か飲みますか。
Would you like something to drink?
誰か来ましたか。
Did someone come?
週末、どこかへ行きましたか。
Did you go anywhere at the weekend?
いつか日本に住みたいです。
I'd like to live in Japan someday.
冷蔵庫に何かありますか。
Is there anything in the fridge?