It's a modal perfect form, but it doesn't mean anything. People don't 'calm enough'.
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AlpheccaStarsHe would have had to be calm and quiet.I am definitely getting old. That simple addition just did not occur to me. A lesson to learners: an apparently minor slip can make your message incomprehensible to some.
sft MHere they used it as a verb, so it is OK without"be".No. The problem is not the verb, calm, but the word "enough."