It takes him half an hour to practise playing basketball every day 改为同义句

He （ spends ）half an hour ( in )playing basketball every day为什么后面是in?似乎有点读不通(我很菜的，别见怪)若表示"在......上花费(时间、金钱等)",常用句型spend some money/ some time on sth.,介词on后接名词或代词。例如: Kitty spends two hours on her homework every day. Kitty每天花两个小时做家庭作业。若表示"花费(时间、金钱等)做某事",则常用句型spend some money / some time (in) doing sth.,此时第二个动词要用动词-ing形式,介词in可以省略。例如: They spent 4450 yuan buying the big colour TV set. 他们买那台大彩电花了4450元。