I PAY IT DOWN 为什么会加一个DOWN ,这个是一天听到老外说的

I PAY IT DOWN 为什么会加一个DOWN ,这个是一天听到老外说的 英语翻译i am ready to pay for the order..but you have not go down on your price to $265.when you make it...i will pay pay 20 percent down for it.这里的20 percent down是什么用法?pay后面不是必须加钱数吗? pay 20 percent down for it. 这里的20 percent down是什么用法? As far as your tuition goes,I'll pay it.为什么用goes?tuition goes? it 放在pay for的前面还是后面?如：I pay for it.还是 I pay it for? I have lost the library's book,and I must pay for it .为什么must和pay for 之间不加TO呢?俩个动词在一起了.. 翻译 pay back pay up pay off pay down write it down it 为什么在down前 —Is there a pay phone ____ the neighborhood?—Yes,it's ____ Center Street ____ the right.A.in,down,on B.on,on,is C.in,on,is D.on,down,on为什么选A? I have to pay much for it 同义句 I___ __to pay much for it how much do i have to（ ）（pay for）it?为什么不用paid for,不是have+过去分词吗 He lent me the money on condition that I pay it back next month.为什么不用paid? I Wish It Would Rain Down 歌词 英语翻译I would like to pay for these items but I have 2 issues:1) This second item that I have to pay for is not the item I selected during the bidding.It was a black short sleeve botton down polo shirt with the polo logo on the top right hand s i wonder what it was (let he down) 为什么错了 ,答案是that let him downi wonder what it was (let he down) 为什么错了 ,答案是that let him down 为什么有what ,that 这是什么结构 I am willing to pay all,please don't let me down. i pay it ___ credit card 是by 还是with