Spend的主语常为“人”,常见搭配有:“sb. spend 时间/金钱 on sth.”或者“sb. spend 时间/金钱 in doing sth.”如: 1)I spend about ¥150 on books every month. 我每个月花大约150元买书。 2)He spends about 30 minutes in practicing basketball every day. 他每天花大约30分钟练习篮球。 Pay的主语也常为“人”,常与for搭配:“sb. pay (sb.)金钱for sth.”如: 3)I paid him ¥300 for the bike. 我付给他300元,买下了这辆自行车。 而cost的主语常为“事物”,常见用法为:“sth. cost sb. 金钱”。如: 4)That book cost me ¥28. 那本书花了我28元。 注意领悟下面两句中cost的含义: 5)The mistake cost him his job. 这个错误使他失去了工作。 6)Careless driving cost him his life. 开车时粗心大意使他丧生。 Take常用于“It takes sb. some time to do sth.”句型中,如: 7)It takes me 20 minutes to go to school by subway every day. 我每天要花20分钟乘地铁上学。 另外,这4个动词的过去式和过去分词都是不规则变化形式:spend/spent/ spent;pay/paid/paid;cost/cost/cost;take/took/taken,需用心记忆。