take spend cost 的用法都可以表示“花费”,但用法却不尽相同.
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) 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.
注意：cost的过去式及过去分词都是cost,并且不能用于被动句.
take后面常跟双宾语,常见用法有以下几种：
(1) It takes sb.＋时间＋to do sth.做某事花了某人多少时间.例：It took them three years to build this road.他们用了三年时间修完了这条路.
(2)doing sth.takes sb.＋时间,做某事花了某人多少时间.例：Repairing this car took him the whole afternoon.他花了一下午修车.
