use of could/might in present context

[Hardwork]

In present context could and might are used as less postive versions of can and may. What does this mean.

[Mister Micawber]

It means that they are more tentative, but it is not true of 'might'.

I can do that for you = 'I am confident that I am able to do it'.
I could do that for you = 'I can do that for you IF you will permit me' or 'I THINK I can do that for you'.

I might/may see you tomorrow-- In spite of the efforts of many grammarians to perceive a difference because they think there must be one, the only difference is which of the two words the individual speaker habitually chooses.
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Native English teacher at Mister Micawber's