pay for
1． give money for付钱
I have paid for these pens．我已付过这些钢笔的钱了。
You pay for it at the time you order it．你订购时就得付款。
2．have trouble because of因…而付出代价
When Bob could not get a good job，he realized he had to pay for all the years of fooling around instead of working hard in school．当鲍勃找不到理想的工作时，他意识到了这些年来他游手好闲，在学校不用心读书，因而得付出代价。
If you don't work now， you'll pay for it later when you fail your exams．你现在不好好学，到考试不及格时就得为此而付出代价。