We can use modal verbs to talk about possibility or to express uncertainty, and ‘might’ is the most common modal verb for such cases.
Statements with ‘might’ can refer to past, present, or future possibilities.
To refer to past possibility, use:
Might + have + past participle
I can’t find my pen. I might have dropped it earlier.
We are lost. We might have taken a wrong turn at the river.
To refer to present possibility, use:
Might + the base form of the verb
Look at Jack! He might be in a hurry to meet with Catherine.
The clouds cover the top of the mountain. It might be windy there.
To refer to future possibility, use:
Might + the base form of the verb + future time marker
It’s cold outside. It might snow later on.
Joe might not come to our party next weekend.