spend，pay，cost与take四者都意为 "spend"，其区别为：
spend (spent, 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 (paid, paid)
sb.pay (s) some money for sth.
某人付钱买某物
cost (cost, cost)
sth.cost (s) (sb.)some money.
某物花费（某人）多少钱
take (took, taken)
it takes sb.some time to do sth.
做某事花费某人多少时间