spend 的主语是人 短语 spend time/money （in） doing sth spend time/money on sth 如He spent five dollars (in) buying the book.he spend five dollar on the book.cost 的主语是物体 短语 sth cost sb money 如the book costs him five dollars.take 主要是短语 一般的主语是 it 有时也可以是物体 短语it/sth takes sb time/money to do sth it takes him five dollars to buy the book.记住这几点就行咯