pay的基本用法：
(1)pay (sb.) money for sth. 付錢(qián)（給某人）買(mǎi)……。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(qián)。例：I have to pay for the book lost.我不得不賠丟失的書(shū)款。
(3)pay for sb. 替某人付錢(qián)。例：Don?蒺t worry!I'll pay for you.別擔(dān)心，我會(huì)給你付錢(qián)的。
(4)pay sb. 付錢(qián)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(qián)。例：May I borrow 12 yuan from you? I'll pay it back next week.你能借給我12塊錢(qián)嗎？下周還你。
(6)pay off one's money 還清錢(qián)。