I do not know the rule of must and may. Please tell me the rule of how to use may and must in sentences.
"Must" is much stronger than "may".
You can use "must" to indicate an obligation: You must pass your driving test before you can drive a car on public roads.
You can use "may" to indicate permission: You may smoke in here.
You can also use "must" when you make a firm conclusion based on evidence: Jack says he was in library at the time, but Mabel says she saw him in the dining room; one of them must be lying.
"May" is then used to indicate that you're not sure if your conclusion is right, but it's possible: Jack may have murdered Lord Arlingworthy; he had the opportunity, but on the other hand he had no motive.
Thanks for this description.
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