pay for前主语可以是sth比如（some money）吗?pay for一定指付钱吗?可以以物易物吗?

pay for前主语可以是sth比如（some money）吗?pay for一定指付钱吗?可以以物易物吗? sb.pay(s)+some money for sth.帮我造句 为什么有时是pay sth而有时是pay for sth 关于it 做形式主语句子的几个问题（1）为什么有的时候是It be adj.for sb.to do sth.有时候却用It be adj.of sb.to do sth.差别在哪里?比如：It is very difficult for me to do it.和 It was very kind of him to pay the bill. pay for sth和pay sb for sth pay sth for money对吗? 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……）？ offer money for sth,pay sb money for sth, pay sth for 10yuan purchase sth for 10 yuan It's +形容词+(for sb.)+to do sth 为什么要用to do sthto do sth 做主语,应该该为是doing sth为什么要用to do sth pay sb.for doing sth.是什么 意思? sb.pay some money for sth.意思 sb pay money for sth=? it is/was adj.for sb to do sth.真正的主语是to do sth,sb是此句的宾语,又是to do s...it is/was adj.for sb to do sth.真正的主语是to do sth,sb是此句的宾语,又是to do sth的逻辑主语,it还是形式主语,sb和is/was没什么 It's+adj.+for sb.+to do sth.是形式主语的一个句型,那么有没有It's+adj.+of sb.+其他,的句型呢?如题 The book is well worth what I paid for it .请大家帮忙分析一下这个句子的结构,为什么pay for前面要用what?可以具体分析一下结构吗？比如 主语 谓语 从句是什么从句 如果是定语从句what修饰什么呢？我 是不是只有pay money for sth?有没有pay pens for sth? 英语pay backpay back sb for sth 还是 pay back sth for sb