could/might

[Hardwork]

1) Do we use could we for a polite request.I'm confused here becuase "could " is a past tense of can so how can we use it in present.

2) "might" is used to express a degree of dissatisfation or reaproach.What does this mean? Please explain me with egs.

[Mordant]

"Could" does make for a more polite request than "can" because it seems a bit more tentative.

Could you please help me with this problem, sir? - "Could" clearly does not refer to the past here. I am not asking if he was once able to help me with it. "Could" is also used to refer to current or future possibilities.

I am completely lost by what you mean in number 2.

Please start placing spaces after periods.