permission or possibility

He asked whether he might come

The king might do nothing without parliament's consent

a past or present possibility that is unfulfilled

I might well have been killed

If he were older he might understand

a purpose or intention in the past

I wrote it down so that I might not forget it

expectation or obligation

You might at least apologize

They might have offered to help

a polite or ironic question

Who might you be?