cost不能用人作主语。解释一下

cost不能用人作主语。解释一下？

cost的主语通常是事或物(包括形式主语it)，不能是人;spend的主语只能是人，不能是事或物;take的主语可以是事或物(包括形式主语it)也可以是人。如：The computer cost (me) $2 000.这部电脑花了(我) 2 000美元。It costs (me) $1 000 a year to run a car.使用一辆车每年要花(我)1 000美元。I have spent all day looking for you.我花了1整天找你。It took me an hour to write the letter.我写这封信花了1个小时。The letter took me an hour (to write). (译文同上)I took an hour to write the letter. (译文同上)注：若cost不是表示“花费”，而是表示客观上地或被动地“耗费”，则也可用人作主语。如：Smokers cost the government a lot of money every year.抽烟的人每年要耗费政府不少钱。注：TAKE COST SPEND 的用法区别：这三个均可表示“花费”，但在用法和搭配等有很大区别。现分述如下：一、从所涉及的主语来看cost的主语通常是事或物(包括形式主语it)，不能是人;spend的主语只能是人，不能是事或物;take的主语可以是事或物(包括形式主语it)也可以是人。如：The computer cost (me) $2 000.这部电脑花了(我) 2 000美元。It costs (me) $1 000 a year to run a car.使用一辆车每年要花(我)1 000美元。I have spent all day looking for you.我花了1整天找你。It took me an hour to write the letter.我写这封信花了1个小时。The letter took me an hour (to write). (译文同上)I took an hour to write the letter. (译文同上)注：若cost不是表示“花费”，而是表示客观上地或被动地“耗费”，则也可用人作主语。如：Smokers cost the government a lot of money every year.抽烟的人每年要耗费政府不少钱。2.从所涉及的宾语来看cost的宾语通常是钱，take的宾语通常是时间，而spend的宾语则可以是时间或钱。如：How much did it cost to build the bridge?建这座桥花了多少钱?It took her two hours to walk to the station.走路去车站花了她两小时。He spends much time (money) on books.他花了很多时间读(钱买)书。注：cost有时也用于时间，但通常只用于笼统时间(一般不用于具体明确的时间)。如：Making experiments like this costs much time and labour.做这样的实验要花很多时间和劳力。按传统语法，take的宾语通常是时间，但在现代英语中，用钱作其宾语的现象已很普遍。如：It takes a lot of money to buy a house.买一座房子要花一大笔钱。3.从所采用的句型结构来看(1)三者的通常句型为：sth costs (sb) money某物花某人多少钱it costs (sb) money to do sth做某事花某人多少钱sb spends time (money) on sth某人在某一方面花多少钱sb spends time (money) in [on] doing sth某人在做某事方面花多少钱it takes sb time (money) to do sth = it takes time (money) for sb to do sth做某事花某人多少时间或钱sth takes sb time (money) to do某事花某人多少时间或钱去做sb takes time (moeny) to do某人花多少时间或钱去做某事(2)用于以上意义时，cost不能用于被动语态，take通常不用于被动语态，而spend则可以用于被动语态。误：Thirty dollars was cost by the coat.误：Two hours was taken to do the work.正：Two hours was spent on the work.做这工作花了两个小时。