I must sign you must sign she must sign we must sign you must sign they must sign
Forma com V-ing
I must be signing you must be signing she must be signing we must be signing you must be signing they must be signing
Perfeito
I must have signed you must have signed she must have signed we must have signed you must have signed they must have signed
Perfeito com V-ing
I must have been signing you must have been signing she must have been signing we must have been signing you must have been signing they must have been signing
Negação
Forma simple
I mustn't sign you mustn't sign she mustn't sign we mustn't sign you mustn't sign they mustn't sign
Forma com V-ing
I mustn't be signing you mustn't be signing she mustn't be signing we mustn't be signing you mustn't be signing they mustn't be signing
Perfeito
I mustn't have signed you mustn't have signed she mustn't have signed we mustn't have signed you mustn't have signed they mustn't have signed
Perfeito com V-ing
I mustn't have been signing you mustn't have been signing she mustn't have been signing we mustn't have been signing you mustn't have been signing they mustn't have been signing
Forma interrogativa
Forma simple
must I sign? must you sign? must she sign? must we sign? must you sign? must they sign?
Forma com V-ing
must I be signing? must you be signing? must she be signing? must we be signing? must you be signing? must they be signing?
Perfeito
must I have signed? must you have signed? must she have signed? must we have signed? must you have signed? must they have signed?
Perfeito com V-ing
must I have been signing? must you have been signing? must she have been signing? must we have been signing? must you have been signing? must they have been signing?
Forma interro-Negação
Forma simple
mustn't I sign? mustn't you sign? mustn't she sign? mustn't we sign? mustn't you sign? mustn't they sign?
Forma com V-ing
mustn't I be signing? mustn't you be signing? mustn't she be signing? mustn't we be signing? mustn't you be signing? mustn't they be signing?
Perfeito
mustn't I have signed? mustn't you have signed? mustn't she have signed? mustn't we have signed? mustn't you have signed? mustn't they have signed?
Perfeito com V-ing
mustn't I have been signing? mustn't you have been signing? mustn't she have been signing? mustn't we have been signing? mustn't you have been signing? mustn't they have been signing?