I must fail you must fail she must fail we must fail you must fail they must fail
Forma com V-ing
I must be failing you must be failing she must be failing we must be failing you must be failing they must be failing
Perfeito
I must have failed you must have failed she must have failed we must have failed you must have failed they must have failed
Perfeito com V-ing
I must have been failing you must have been failing she must have been failing we must have been failing you must have been failing they must have been failing
Negação
Forma simple
I mustn't fail you mustn't fail she mustn't fail we mustn't fail you mustn't fail they mustn't fail
Forma com V-ing
I mustn't be failing you mustn't be failing she mustn't be failing we mustn't be failing you mustn't be failing they mustn't be failing
Perfeito
I mustn't have failed you mustn't have failed she mustn't have failed we mustn't have failed you mustn't have failed they mustn't have failed
Perfeito com V-ing
I mustn't have been failing you mustn't have been failing she mustn't have been failing we mustn't have been failing you mustn't have been failing they mustn't have been failing
Forma interrogativa
Forma simple
must I fail? must you fail? must she fail? must we fail? must you fail? must they fail?
Forma com V-ing
must I be failing? must you be failing? must she be failing? must we be failing? must you be failing? must they be failing?
Perfeito
must I have failed? must you have failed? must she have failed? must we have failed? must you have failed? must they have failed?
Perfeito com V-ing
must I have been failing? must you have been failing? must she have been failing? must we have been failing? must you have been failing? must they have been failing?
Forma interro-Negação
Forma simple
mustn't I fail? mustn't you fail? mustn't she fail? mustn't we fail? mustn't you fail? mustn't they fail?
Forma com V-ing
mustn't I be failing? mustn't you be failing? mustn't she be failing? mustn't we be failing? mustn't you be failing? mustn't they be failing?
Perfeito
mustn't I have failed? mustn't you have failed? mustn't she have failed? mustn't we have failed? mustn't you have failed? mustn't they have failed?
Perfeito com V-ing
mustn't I have been failing? mustn't you have been failing? mustn't she have been failing? mustn't we have been failing? mustn't you have been failing? mustn't they have been failing?