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.