Emphasis for "to be"

[Eagle]

Hello

I know when adding emphasis, it is possible to use do/did +infinitive in affirmative sentences. For example:
I did see him.
I do go to the school.

Can I use emphasis with the verb "to be"? and can I emphasise comands, using "be", like this: Be quiet.

Well, thanks in advance

[Mister Micawber]

.
Yes, and it is very common:

Do be quiet-- I am trying to hear the TV!
.
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Native English teacher at Mister Micawber's