I have a niece in Germany married (for 15 years or so) to a German.  She tutors children in English and asks the following question:
 
"Do you ever use "needn't or mustn't" when you speak? Maybe it's British because it sure sounds weird to me. Kids have to learn this in 5th grade and to me it seems like unnecessary vocabulary..."
 
Both sound normal to me. But that might be because I lived and taught in England for several years.   
 
Jane Saral
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