"Who can tell me what happened?" 这句话从语法上讲,正确么?

Who can tell me Who can tell me Who Can Tell Me who can tell me who can tell me, who can tell me? Can you tell me?Who? Who can tell me why? who can tell me?翻译 Who can tell me why? Who‘s SB?Who can tell me? Who is him,Can you tell me,please?tell me who can tell me what is love what is love Who can tell me Who can tell me 山楂 in English Can you tell me who she is? Who can tell me么意思? who can tell me.英语四道选择.