Could
Could + verb (in all grammatical persons) can express a possibility to do something or act somehow or the past time of can. The meaning usually depends on the context.
Positive sentence
I could come at six.
She could swim when she was five.
Negative sentence
We could not (couldn’t) do our homework as there was a power outage.
We certainly could not go there.
Question
Could they use your telephone?
Could he help me tomorrow?
Might
Might + verb (in all grammatical persons) usually expresses a slight probability.
He might know about it. (Perhaps he knows about it.)
They might come tomorrow. (Maybe they will come tomorrow.)
Be careful! It is dark over there. You might trip and fall.
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