I must party you must party she must party we must party you must party they must party
V-ing form
I must be partying you must be partying she must be partying we must be partying you must be partying they must be partying
Perfect
I must have partied you must have partied she must have partied we must have partied you must have partied they must have partied
V-ing perfect
I must have been partying you must have been partying she must have been partying we must have been partying you must have been partying they must have been partying
Negation
Simple form
I mustn't party you mustn't party she mustn't party we mustn't party you mustn't party they mustn't party
V-ing form
I mustn't be partying you mustn't be partying she mustn't be partying we mustn't be partying you mustn't be partying they mustn't be partying
Perfect
I mustn't have partied you mustn't have partied she mustn't have partied we mustn't have partied you mustn't have partied they mustn't have partied
V-ing perfect
I mustn't have been partying you mustn't have been partying she mustn't have been partying we mustn't have been partying you mustn't have been partying they mustn't have been partying
Interrogative form
Simple form
must I party? must you party? must she party? must we party? must you party? must they party?
V-ing form
must I be partying? must you be partying? must she be partying? must we be partying? must you be partying? must they be partying?
Perfect
must I have partied? must you have partied? must she have partied? must we have partied? must you have partied? must they have partied?
V-ing perfect
must I have been partying? must you have been partying? must she have been partying? must we have been partying? must you have been partying? must they have been partying?
Interro-negative form
Simple form
mustn't I party? mustn't you party? mustn't she party? mustn't we party? mustn't you party? mustn't they party?
V-ing form
mustn't I be partying? mustn't you be partying? mustn't she be partying? mustn't we be partying? mustn't you be partying? mustn't they be partying?
Perfect
mustn't I have partied? mustn't you have partied? mustn't she have partied? mustn't we have partied? mustn't you have partied? mustn't they have partied?
V-ing perfect
mustn't I have been partying? mustn't you have been partying? mustn't she have been partying? mustn't we have been partying? mustn't you have been partying? mustn't they have been partying?