英语中,如果固定搭配后面有to,to是不是介词?如果不完全是,请举例子!

1.动词+介词to+动名词
(1) admit to doing sth 承认做了某事
(2) apply to doing sth 适用于做某事
(3) object to doing sth 反对做某事
(4) see to doing sth 负责做某事
(5) stick to doing sth 坚持做某事
(6) take to doing sth 喜欢上做某事,逐渐习惯做某事
2.动词+宾语+介词to+动名词
(1) apply oneself to doing sth 专心致力于做某事
(2) devote sth to doing sth 把时间(钱,精力等)献给做某事
(3) devote oneself to doing sth 把时间(钱,精力等)献给做某事
(4) limit sth to doing sth 把…限制在做某事的范围内
(5) reduce sb to doing sth 使某人沦为做某事
3.动词+名词+介词to+动名词
(1) give one's life to doing sth 献身于做某事
(2) give one's mind to doing sth 专心做某事
(3) have a dislike to doing sth 厌恶做某事
(4) have an eye to doing sth 注意做某事
(5) have an objection to doing sth 反对(反感)做某事
(6) pay attention to doing sth 注意做某事
(7) set one's mind to doing sth 决心做某事
4.be+形容词+介词to+动名词
(1) be equal to doing sth 等于做某事,能胜任做某事
(2) be used to doing sth 习惯于做某事
(3) be opposed to doing sth 反对做某事
(4) be reduced to doing sth使某人沦为做某事
(5) be devoted to doing sth 把时间(钱,精力等)献给做某事
(6) be limited to doing sth把…限制在做某事的范围内
5.其他结构+介词to+动名词
(1) get down to doing sth开始做某事,认真处理某事
(2) look forward to doing sth 盼望做某事
(2) What do you say to doing sth?你认为做某事如何?
……
摘自 英语语法网 yygramma

是的，否有规律可寻