must not, may not, or cannot?

These are used in different situations, for example:

1. A fugitive takes refuge in a friend's house. The friend is very sympathetic and would never turn him in to authorities. However, he fears that, with every house being searched, his friend will be found. He says to him: "You must not stay here (you'll be found if you do)."

2. A fugitive seeks refuge in a person's house.

sophianz1) You must not stay here.

~ You must leave. ~ You have to leave.

sophianz2) You may not stay here.

~ You must not stay here.
~ You are not permitted to stay here.

sophianz3) You cannot stay here.

~ You must not stay here.
~ You may not stay here.
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Thank you, Anonymous.

Thank you for your reply, CalifJim.

I understand as follows. Am I right?
"May not" and "cannot" are very similar. But "must not" is not that similar to "may not" and "cannot".

Anonymous"May not" and "cannot" are very similar.

In the context of giving or receiving permission, yes. In that case "may not" is more formal. These are about the same:

May I borrow this book from you?
Can I borrow this book from you?

AnonymousBut "must not" is not that similar to "may not" and "cannot".

Thank you again, CalifJim.

According to my understanding the may not and must not, these are two different words, when someone is speaking on may not this word can restrict as well as all depending I whether you qualify to do the required task and must not restrict someone from doing the task as that person is unqualified to do the task

E. D