Cuidado, este verbo pode não existir, a conjugação é dada como exemplo.
Afirmação
Forma simple
I must stay up you must stay up he must stay up we must stay up you must stay up they must stay up
Forma com V-ing
I must be stay uping you must be stay uping he must be stay uping we must be stay uping you must be stay uping they must be stay uping
Perfeito
I must have stay uped you must have stay uped he must have stay uped we must have stay uped you must have stay uped they must have stay uped
Perfeito com V-ing
I must have been stay uping you must have been stay uping he must have been stay uping we must have been stay uping you must have been stay uping they must have been stay uping
Negação
Forma simple
I mustn't stay up you mustn't stay up he mustn't stay up we mustn't stay up you mustn't stay up they mustn't stay up
Forma com V-ing
I mustn't be stay uping you mustn't be stay uping he mustn't be stay uping we mustn't be stay uping you mustn't be stay uping they mustn't be stay uping
Perfeito
I mustn't have stay uped you mustn't have stay uped he mustn't have stay uped we mustn't have stay uped you mustn't have stay uped they mustn't have stay uped
Perfeito com V-ing
I mustn't have been stay uping you mustn't have been stay uping he mustn't have been stay uping we mustn't have been stay uping you mustn't have been stay uping they mustn't have been stay uping
Forma interrogativa
Forma simple
must I stay up? must you stay up? must he stay up? must we stay up? must you stay up? must they stay up?
Forma com V-ing
must I be stay uping? must you be stay uping? must he be stay uping? must we be stay uping? must you be stay uping? must they be stay uping?
Perfeito
must I have stay uped? must you have stay uped? must he have stay uped? must we have stay uped? must you have stay uped? must they have stay uped?
Perfeito com V-ing
must I have been stay uping? must you have been stay uping? must he have been stay uping? must we have been stay uping? must you have been stay uping? must they have been stay uping?
Forma interro-Negação
Forma simple
mustn't I stay up? mustn't you stay up? mustn't he stay up? mustn't we stay up? mustn't you stay up? mustn't they stay up?
Forma com V-ing
mustn't I be stay uping? mustn't you be stay uping? mustn't he be stay uping? mustn't we be stay uping? mustn't you be stay uping? mustn't they be stay uping?
Perfeito
mustn't I have stay uped? mustn't you have stay uped? mustn't he have stay uped? mustn't we have stay uped? mustn't you have stay uped? mustn't they have stay uped?
Perfeito com V-ing
mustn't I have been stay uping? mustn't you have been stay uping? mustn't he have been stay uping? mustn't we have been stay uping? mustn't you have been stay uping? mustn't they have been stay uping?