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
it
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～

Question

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
it 
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～

Answer

thank you so much！

Answer

"These things are important for your avoiding this risk."
"I'm used to his smoking all day." 
These are good English, in correct grammar, though a little formal.You will often, in modern informal English, see and hear the possessive ("your", "his") replaced by an accusative ("you", him").  
"If you want to speak English fluently, you'd better not take it seriously." This would be a workable alternative to what you have. 
"It will make your finding a job easier If you have a doctor's degree." Again, this is completely correct (if a little formal). 
I'm afraid your version, "it will make you find a job easier" is more tricky. You could use "It will help you find a job more easily. "  http://www.whichenglish.com/Better-English-Grammar/usage/easier-or-more-easily.html   I hope this helps :)