pay的过去分词是paid。pay的基本意思是“付给”“付出”,指某人买东西或做某事所花费的金钱。引申可表示为“给予”。pay既可用作及物动词,也可用作不及物动词，还可接双宾语。
pay的例句
1. Interest is paid monthly. Three months' notice is required for withdrawals.
利息按月支付。提款须提前3个月通知银行。
2. Sandra was determined to become a doctor and her persistence paid off.
桑德拉决心成为医生，她的坚持取得了成功。
3. He paid for and was assigned a cabin in first class.
他付完钱后被安排到了头等舱。
4. He is cagey about what he was paid for the business.
他对自己在这桩买卖中所得的报酬不愿多提。
5. Every worker will be entitled to four weeks' paid holiday a year.
每位工人每年都能享受4周的带薪休假。