pay 和pay for 的异同?

pay 和pay for 的异同? pay for 和pay back的区别? pay for 和pay of的区别 pay ……for 和pay for的区别 pay for sb和pay sb的区别 purchase for 和pay for 的区别? pay,pay for,pay back,pay off,pay back for的用法 pay off与pay for的区别 pay and pay for的用法 pay attention to pay attention with pay attention for请问有什么异同? 为什么是pay for it 不是pay it for 呢,put it on 就可以,还有pay for 和pay 的区别是什么 pay back 和 pay off的用法? pay for pay...for和pay for的区别说明原因!有什么区别就行了! pay for sth和pay sb for sth 英语翻译用 pay for 和 pay...for...翻译 pay for sb; pay to sb; pay sb 区别尤其是pay to sb和pay sb有区别吗 pay sth.和 pay for sth.有什么区别是不是不可以说 pay the pen,只能 pay ＋可以充当钱的东西（帐单，小费……）？