김지혜님 안녕하세요

쉽게 설명해드리자면, he, they가 who가 되는 것이라면,

him, them이 whom 이 되는 것입니다.

He gave me this flower.

-> Who gave me this flower?

I gave this flower to him.

-> To whom did I give this flower?

감사합니다.