如果不定式修饰time， place， way，可以省略介词：
He has no place to live.
This is the best way to work out this problem.
如果不定式所修饰名词是不定式动作承受者，不定式可用主动式也可用被动式：
Have you got anything to send?
Have you got anything to be sent?
②说明所修饰名词的内容：
We have made a plan to finish the work.
③被修饰名词是不定式逻辑主语：
He is the first to get here.
3、难点解析
（1）接不定式或动名词在意思上有区别的动词：
mean to do想要(做某事)propose to do打算(做某事)
mean doing意味(做某事)propose doing建议(做某事)
forget to do忘记(要做的事)remember to do记得(要做某事)
forget doing忘记(已做的事)remember doing记得(已做过的事)
regret to do(对将要做的事)遗憾go on to do继而(做另一件事)
regret doing(对已做过的事)后悔go on doing继续(做原来的事)
stop to do停下来去做另一件事
stop doing停止正在做的事
（2）下列动词短语中的to是介词，后面应接动名词或名词：
object to，resort to，react to，contribute to，look forward to，be accustomed to，be committed to.be exposed to，be subjected to，be devoted to，be dedicated to，be opposed to，
be reconciled to，be contrary to