pay的過去式例句：
1. Interest is paid monthly. Three months' notice is required for withdrawals.
利息按月支付。提款須提前3個月通知銀行。
2. Sandra was determined to become a doctor and her persistence paid off.
桑德拉決心成為醫生，她的堅持取得了成功。
3. He paid for and was assigned a cabin in first class.
他付完錢后被安排到了頭等艙。
4. He is cagey about what he was paid for the business.
他對自己在這樁買賣中所得的報酬不愿多提。