Sir, you must be selected as Beary Academy President. You Deserve it.
You probably mean "should" rather than "must", though both are grammatical. Also, you may mean "elected" instead of "selected" or maybe neither. I'm guessing you want this: Sir, you should be (elected) president of Beary Academy.
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You probably mean "should" rather than "must", though both are grammatical. Also, you may mean "elected" instead of "selected" or maybe neither. I'm guessing you want this:
Sir, you should be (elected) president of Beary Academy. You deserve it.
CJ