prohibition

[fadysandy]

The baby is asleep, so you mustn't make a noise.
I've read this sentence in a book. Although it isn't a rule or a law, we have used mustn't. Is it OK?

 

[bhaisahab]

The baby is asleep, so you mustn't make a noise.
I've read this sentence in a book. Although it isn't a rule or a law, we have used mustn't. Is it OK?

It's OK.

 

[fadysandy]

Can we consider it strong advice?

 

[bhaisahab]

Can we consider it strong advice?

More of a command, really.