Convert into Imperitif : tu es calme

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You might point out to your teacher or whoever set this that it a poorly set  task - you can tell someone to be calm, stay calm, calm down or whatever,  but there is no such thing as the imperative of ‘you are calm’ !

Hi Maarten, what would be the indicative (non-imperative) version of "be calm!" ?

P.S.: As you can tell, I love discussing grammar ;)

@Chris,

Not Maarten's answer, but this interests me also.

How about the present infinitive Se calmer   --  To calm oneself   (Calm yourself)