I must busy you must busy she must busy we must busy you must busy they must busy
Forma con V-ing
I must be busying you must be busying she must be busying we must be busying you must be busying they must be busying
Perfecto
I must have busied you must have busied she must have busied we must have busied you must have busied they must have busied
Perfecto con V-ing
I must have been busying you must have been busying she must have been busying we must have been busying you must have been busying they must have been busying
Negación
Forma simple
I mustn't busy you mustn't busy she mustn't busy we mustn't busy you mustn't busy they mustn't busy
Forma con V-ing
I mustn't be busying you mustn't be busying she mustn't be busying we mustn't be busying you mustn't be busying they mustn't be busying
Perfecto
I mustn't have busied you mustn't have busied she mustn't have busied we mustn't have busied you mustn't have busied they mustn't have busied
Perfecto con V-ing
I mustn't have been busying you mustn't have been busying she mustn't have been busying we mustn't have been busying you mustn't have been busying they mustn't have been busying
Forma interrogativa
Forma simple
must I busy? must you busy? must she busy? must we busy? must you busy? must they busy?
Forma con V-ing
must I be busying? must you be busying? must she be busying? must we be busying? must you be busying? must they be busying?
Perfecto
must I have busied? must you have busied? must she have busied? must we have busied? must you have busied? must they have busied?
Perfecto con V-ing
must I have been busying? must you have been busying? must she have been busying? must we have been busying? must you have been busying? must they have been busying?
Forma interro-negativa
Forma simple
mustn't I busy? mustn't you busy? mustn't she busy? mustn't we busy? mustn't you busy? mustn't they busy?
Forma con V-ing
mustn't I be busying? mustn't you be busying? mustn't she be busying? mustn't we be busying? mustn't you be busying? mustn't they be busying?
Perfecto
mustn't I have busied? mustn't you have busied? mustn't she have busied? mustn't we have busied? mustn't you have busied? mustn't they have busied?
Perfecto con V-ing
mustn't I have been busying? mustn't you have been busying? mustn't she have been busying? mustn't we have been busying? mustn't you have been busying? mustn't they have been busying?