1、比较法。例如，把表示“花费”的take, spend, pay, cost这四个词语放在一起比较，便知道它们各自的习惯搭配句型是有区别的：

1) It takes somebody some time to do something.

2) Somebody spends some money or time on (in doing) something.

3) Somebody pays some money for something.

4) Something costs some money.