Conjugación del verbo inglés
MUST SIGN

Verbo regular: sign - signed - signed

Afirmación

Forma simple	Forma con V-ing
I must sign you must sign he must sign we must sign you must sign they must sign	I must be signing you must be signing he must be signing we must be signing you must be signing they must be signing
Perfecto	Perfecto con V-ing
I must have signed you must have signed he must have signed we must have signed you must have signed they must have signed	I must have been signing you must have been signing he must have been signing we must have been signing you must have been signing they must have been signing

Negación

Forma simple	Forma con V-ing
I mustn't sign you mustn't sign he mustn't sign we mustn't sign you mustn't sign they mustn't sign	I mustn't be signing you mustn't be signing he mustn't be signing we mustn't be signing you mustn't be signing they mustn't be signing
Perfecto	Perfecto con V-ing
I mustn't have signed you mustn't have signed he mustn't have signed we mustn't have signed you mustn't have signed they mustn't have signed	I mustn't have been signing you mustn't have been signing he 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	Forma con V-ing
must I sign? must you sign? must he sign? must we sign? must you sign? must they sign?	must I be signing? must you be signing? must he be signing? must we be signing? must you be signing? must they be signing?
Perfecto	Perfecto con V-ing
must I have signed? must you have signed? must he have signed? must we have signed? must you have signed? must they have signed?	must I have been signing? must you have been signing? must he have been signing? must we have been signing? must you have been signing? must they have been signing?

Forma interro-negativa

Forma simple	Forma con V-ing
mustn't I sign? mustn't you sign? mustn't he sign? mustn't we sign? mustn't you sign? mustn't they sign?	mustn't I be signing? mustn't you be signing? mustn't he be signing? mustn't we be signing? mustn't you be signing? mustn't they be signing?
Perfecto	Perfecto con V-ing
mustn't I have signed? mustn't you have signed? mustn't he have signed? mustn't we have signed? mustn't you have signed? mustn't they have signed?	mustn't I have been signing? mustn't you have been signing? mustn't he have been signing? mustn't we have been signing? mustn't you have been signing? mustn't they have been signing?