Modal verbs are verbs that are typically used in combination with another verb in the infinitive.
A modal verb follows the same conjugation for all personal pronouns.
May – Might – is used to signify a possibility
I might go skateboarding.
We may join you tomorrow.
They might be late.
Can – Could – is used to signify the ability or the possibility
I can read.
He can speak three languages.
We could go out tomorrow.
She could not find her purse.