How to use the negative form of the verb may – may not?

Use may not to express prohibition.

For example, a phrase like this: You may not use your phone during the exam.
Solidify this grammar point right now
(you will be asked to create an account if you do not have one)

Learn more simple rules

Phrase the Cat inviting to practise English Phrase the Cat waving

At you can study grammar points and practise their application right away.