pay的基本用法：
(1)pay (sb.) money for sth. 付錢（給某人）買……。例：I have to pay them 20 pounds for this room each month. 我每個(gè)月要付20英磅的房租。
(2)pay for sth. 付……的錢。例：I have to pay for the book lost.我不得不賠丟失的`書款。
(3)pay for sb. 替某人付錢。例：Don?蒺t worry!I'll pay for you.別擔(dān)心，我會(huì)給你付錢的。
(4)pay sb. 付錢給某人。例：They pay us every month.他們每月給我們報(bào)酬。
(5)pay money back 還錢。例：May I borrow 12 yuan from you? I'll pay it back next week.你能借給我12塊錢嗎？下周還你。
(6)pay off one's money 還清錢。