It depends on the type of dance. In Ballet they're are endless rules and things you have to do. For other forms, they may be less specific.
ya
Safety
make sure they show all the right moves and score just them
Modern dance is diversed from Classical Ballet where the dancers/choreographers try to break the rules and strict of Classical...i.e., in Classical the dancers tend to dance on turn out most of the time and seems to concentrate to work on their legs , whereas in Modern is dance in turn-in feet and use the spines and focus on relaxation of upper body. Contemporary is the dance style that combined or influenced by other dance style but still based on relaxation and freedom of movement rather than rigid as in classical ballet.
It really depends on the ballet teacher, and their rules. They may have strict dress code rules, or they may be relaxed about it. Just ask your ballet teacher what you're required to wear.
the peoples must dance
no bad langue
Don't you mean, "In what language was the systemised rules for Ballet written; for the Royal Academy of Dance in 1661?"
ya
The Unwritten Rules - 2012 Let's Dance 1-6 was released on: USA: 5 September 2012
break all traffic rules
Safety
the rules of hip hop dancing is to make sure you have sharp movements to be able to perform to dance standards
According to Kidnap it's tango.
Real World Road Rules Challenge - 1998 The Duel Pole Dance 13-9 was released on: USA: 30 November 2006
yiour are the weakest slink goodbye
Somtimes. Because thats when you learn all of the rules and each others names. And Also no because you might not learn a dance yet.