Simone
应该是是spend time on sth.或者spend time in doing sth.spend的主语必须是人，常用于以下结构：(1) spend time ／money on sth. 在歼罩羡……上花费时间(金钱)。例：I spent two hours on this maths problem. 这道数学题花了我两个小闷纤时。(2) spend time ／ money (in) doing sth. 花费时间(金钱)做某事。例：氏拍They spent two years (in) building this bridge. 造这座桥花了他们两年时间。(3)spend money for sth. 花钱买……。例：His money was spent for books. 他的钱用来买书了。cost的主语是物或某种活动，还可以表示”值”，常见用法如下：(1)sth. costs (sb.) ＋金钱,某物花了(某人)多少钱。例：A new computer costs a lot of money. 买一台新电脑要花一大笔钱。(2) (doing) sth. costs (sb.) ＋时间,某物(做某事)花了(某人)多少时间。例：Remembering these new words cost him a lot of time. 他花了大量时间才记住了这些单词。
