what is difference between "누구" and "누가"? 用 韓語 要怎麼說？

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누구 for "who is"
그분 누구예요? (who is that person?)
누구랑 갔어요? (with who you went there?)

누가 for "who is".
누가 제일 예뻐? (which one is the most beautiful?)

누가 for "who does"
누가 그래? (who said?)
누가 나를 좋아해? (who does like me?)
누가 tv를 봤어요? (who did watch tv?)

누가 is from 누구 + 가
*이 / 가 put more emphasis to the subject rather than 은 / 는