Using in a Sentence

You mustn't lose your temper with him.
You mustn't smoke here.
You mustn't worry too much about this.
I have two copies, and will send you one; but you mustn't show it to anybody.
You mustn't leave litter lying around.
That must make you about five years old.
He must have changed clothes during the night.
You must be mistaken.
She must be very uneasy about you.
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