spend,pay,cost与take四者都有"花费"之意，其区别为：
spend (过去式 spent,过去分词spent)
①Sb.spend (s) some time/money on sth. ;
某人在某事／某物上花费一些时间／金钱；
②Sb.spend (s)some time/money( in) doing sth.
某人花费一些时间／金钱做某事
pay (过去式 paid,过去分词 paid)
Sb.pay (s) some money for sth.
某人付钱买某物
cost (过去式 cost,过去分词 cost)
Sth.cost (s) (sb.)some money.
某物花费（某人）多少钱
take (过去式took,过去分词 taken)
It takes sb.some time to do sth.
做某事花费某人多少时间
