Does this mean "I forbid you - you're not allowed" or is it a compaint as in "come on!! you've been grumpy this whole time!! You cannot go on being grumpy the whole evening!"? Or could it be both?
Either, I suppose, but the latter is way more likely. How would you forbid someone from feeling something? :)
Well you can forbid them to come if they act a certain way: "you're not allowed to (come if you) feel (and act) grumpy"...
Anyway my doubt was if the second could apply too, so thanks for your answer :)
I think in that case I'd be explicit and say that, just like in English. :)
I was imagining a strict, rich 'gammaldags' mother telling their naughty child that they had to be on their best behaviour and not be grumpy for the entire party
Why they are not allowed to be grumpy the entire party wasn't accepted
Why can't I use angry?
"angry" is stronger than just "grumpy".
Why isn't "you are not allowed to be grumpy the entire party" not accepted?
That actually is accepted. If you were marked wrong for exactly that, you suffered a bug.