How to say what do you know about him? in Japanese
1)
あなたあなた(anata) (pn,adj-no) youはは(ha) (int) indicating a subject/yes/indeed/well/ha!/what?/huh?/sigh彼彼(kare) (ok) that , or something understood without naming it directly)/that person/over there/hey/eh?/thatに(prt) indicates such things as location of person or thing, location of short-term action, etc.ついてどういうno dictionary result, likely a conjigated verbことこと(koto) (prt) particle indicating a command/particle indicating mild enthusiasm/particle indicating a gentle interrogative/particle used to soften a judgment or conclusionをを(wo) (prt) indicates direct object of action/indicates subject of causative expression/indicates an area traversed/indicates time over which action takes place/indicates point of departure or separation of action/indicates object of desire, like, hate,知ってno dictionary result, likely a conjigated verbno dictionary result, likely a conjigated verbいい(i) (prt) strengthens a question, assertion, etc.ますます(masu) (aux-v) used to indicate respect for the listener/ used to indicate respect for those affected by the actionかか(ka) (prt) indicates question/indicates choice, doubt, etc.。。(。) Japanese period "."
