what's the difference between you will want to do and you will do
I often hear someone say you will want to do something rather than you may do something or you will do something, can you explain the difference and give me an example? Thank you very much!

Question

what's the difference between you will want to do  and you will do
I often hear someone say you will want to do something rather than you may do something or you will do something, can you explain the difference and give me an example? Thank you very much!

Answer

If I tell you that I have just seen a terrific movie, I might then add 'you will want to see it" - meaning that I am encouraging you to see it, because I think you will enjoy it too.
"You may do' is used to give permission.  You may do whatever you want once the exam is over (although many, many English speakers use 'can' here instead of may).
If I tell you that you will do something  this can either be me telling you that you must do something - "you WILL pay back the money, or else", or just stating something that I know will happen in the future - for example, 'when you land in Sydney, you will notice it is much warmer than London".

Answer

When you do something you want,time goes faster.While something you will,time gose slowly.