だれ・なに・どこ・いつ・いくら: who / what / where / when / how much

Question words that ask for the missing information in a sentence.

Put the question word where the answer would go, then add か (and keep word order). 誰=who, 何=what, どこ=where, いつ=when, いくら=how much. Particles stay after them: 誰が, どこに, 何を. No question mark is needed with か.