1.某人花费多长时间做某事:It takes sb. +一段时间 to do sth.(主语经常是it, 后接真正的主语不定式 )
如:It often takes me an hour to finish my homework.
It took him two days to solve the problem.
2.某人花多少钱买某物:Sb. spend +钱的数目on sth. (主语必须是人)
某人花多少时间做某事:Sb. spend +一段时间 in doing sth. (in 可省略)
Mary spent 50 dollars on the dress yesterday.
They spent a week (in) finding out the truth.
3. 用cost时,主语必须是物。
The book cost me ten yuan.
4. Pay 一般指付钱,主语必须是人。(pay for sth./ pay sb. +钱的数目 for sth.)即直接带人作宾语时,不跟介词; 带物作宾语时要跟介词for.
He couldn't pay for the meal because he had little money with him.
I paid the girl 20 yuan for the picture.
It takes sb +time \ money to do sth.sth cost money\ timesb spend money \ time ( in) doing sthsb spend money \ time on sthsb pay for
cost spend take
cost:sb. cost money
spent :sb spent money doing sth
take:it take money to do sth
pay sb. pay money for sth
charge sb for sth想某人要价