for whether can always use “doing” instead of “to do” or “do”by changing sentences' structure
there is a sentence :
It will make your finding a job easier If you have a doctor's degree
if written in my way，it would be :
it will make you find a job easier......
based on it，Im trying to make some sentences by my present understanding of it:
these things are important for your avoiding this risk.
I'm used to his smoking all day.
if you want your speaking English fluently，you 'd better not take it seriously while speaking it.
thats all，sorry for troubling you guys in advance～