to do还是to doing

 to有时是不定式符号，有时是介词，所以英语有时用to do，有时用to doing。对于许多同学来说，to do容易理解，但 to doing 则很容易搞错。从中学英语所接触的知识来看，to doing的用法主要仅于某些固定搭配，如：

  adapt to doing sth 适应做某事

  admit to doing sth 承认做了某事

  apply to doing sth适用于做某事

  object to doing sth 反对做某事

  see to doing sth 负责做某事

  stick to doing sth 坚持做某事

  take to doing sth 喜欢上做某事

  apply oneself to doing sth 专心于做某事

  devote…to doing sth把……献给做某事

  be opposed to doing sth 反对做某事

  reduce sb to doing sth 使某人沦为做某事

  key to doing sth 做某事的关键

  limit to doing sth 做某事的限度

  pay attention to doing sth 注意做某事

  set one’s mind to doing sth 决心做某事

  be used to doing sth 习惯于做某事

  get down to doing sth开始做某事

  look forward to doing sth 盼望做某事

  in addition to doing sth 除做某事之外

  The key to solving the problem is to meet the demand made by the customers. 解决这个问题的关键就是满足顾客的要求。

  Be sure to pay attention to protecting the environment and be considerate while traveling. 外出旅游时务必注意保护环境，为他人着想。

  We are looking forward to taking part in the opening ceremony of the art to be held next week. 我们盼望能参加下星期举行的艺术节开幕式。