take :主语是物,it takes sb.( some time ) (to do .) cost 主语也是物 it costs sb.(some money) .. pay for 主语是人sb.pay (money )for sth.买,付了多少钱的意思, spend 主语是人 sb.spend .(in) doing sth.或on sth,
spend的主语必须是人, 常用于以下结构:(1) spend time /money on sth. 在……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时。(2) spend time / money (in) doing sth. 花费时间(金钱)做某事。例:They spent two years (in) ...