We use might / might no + Verb (Infinitive without to) to say that perhaps you will or won’t do something. (Small possibility)
- Might / might not is the same for all persons.
- Might not is not usually contracted.
E.g. We might have English classes tomorrow. = Perhaps we will have English classes tomorrow.
E.g. He might not come with us, I think. = Perhaps he won’t come with us.
- May / May not
You can also use may / may not instead of might / might not for possibility. (Formal permissions).
E.g. We may have Spanish classes today. = We might have Spanish classes today.
E.g. I may not go to the cinema with you. = I might not go to the cinema with you.