用spare或者 to spare来代替句子中括号的词.

题目

用spare或者 to spare来代替句子中括号的词.
There is an (extra) wheel in the back of the car.//spare
I always go on excursions in myu (free) time.//spare
"Have you any old clothes （that you do not want?）" he asked.//to spare
The guest slept in the room (we do not use).//to spare
("Do not kill me!") begged the prisoner.//to spare
//里面是偶添的,
是这样么?可是我还是不太明白什么时候用to spare.
我只知道形容词是修饰名词代词,什么的,碰到后面是名词,代词的我就用的spare,其他用的to spare.
可是究竟什么情况下用to spare呢?好像这些话都是一个句子.替换to spare的.

答案

首先,请楼主搞清spare 和to spare的词义:------------------------------------*to spare有节余：超过所需要的：We paid our bills and had money to spare.我们付帐后还有节余*spare 1.adj.多余的, 剩下的, 高而瘦...