B.P.鲍恩:spend on 与 spend in有什么区别?

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spend on 与 spend in有什么区别?spend on sth.
spend in doing 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) 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。

  pay的基本用法是:

  (1) pay (sb.) money for sth. 付钱(给某人)买……。例:I have to pay them 20 pounds for this room each month. 我每个月要付20英磅的房租。

  (2)pay for sth. 付……的钱。例:

  I have to pay for the book lost. 我不得不赔丢失的书款。

  (3)pay for sb. 替某人付钱。例:

  Don’t worry! I'll pay for you. 别担心,我会给你付钱的。

  (4)pay sb. 付钱给某人。例:

  They pay us every month.他们每月给我们报酬。

  (5)pay money back 还钱。例:

  May I borrow 12 yuan from you? I'll pay it back next week. 你能借给我12块钱吗?下周还你。

  (6)pay off one's money还清钱。   She spent much time in playing the piano.