英语问题（您的提问不够清晰,请将问题说明清楚,网友才能为您解答）Whodoyouknowthatarefriendsthatjustfoolaround?Whatkindofsportsdoyouknowthatarerelatedtohorse-riding?句子结构不理解,doyouknow是

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英语问题（您的提问不够清晰,请将问题说明清楚,网友才能为您解答）
Who do you know that are friends that just fool around?
What kind of sports do you know that are related to horse-riding?
句子结构不理解,do you know是插入语的话,怎么有who 又有that?

Answer 1

这两个句子中的 do you know 都不是插入语,而是主句疑问句,而且都是对主句宾语提问.Who do you know that are friends that just fool around?中的 who 是问 know 的宾语（= Do you know whom that are friends that...