to有时作介词,而有时不是介词.
to构成不定式时后接原形,作介词时后接ing形式——
be used to doing sth习惯于做某事
give one’s life to doing sth.献身于做某事
look forward to doing sth期待做某事
give one’s mind to doing sth.专心做某事
have a dislike to doing sth.厌恶做某事
have an eye to doing sth.注意做某事
have an objection to doing sth.反对（反感）做某事
pay attention to doing sth.注意做某事
set one’s mind to doing sth.决心做某事