Conjugación del verbo inglés
MUST SUM

Verbo regular: sum - summed - summed

Afirmación

Forma simple	Forma con V-ing
I must sum you must sum he must sum we must sum you must sum they must sum	I must be summing you must be summing he must be summing we must be summing you must be summing they must be summing
Perfecto	Perfecto con V-ing
I must have summed you must have summed he must have summed we must have summed you must have summed they must have summed	I must have been summing you must have been summing he must have been summing we must have been summing you must have been summing they must have been summing

Negación

Forma simple	Forma con V-ing
I mustn't sum you mustn't sum he mustn't sum we mustn't sum you mustn't sum they mustn't sum	I mustn't be summing you mustn't be summing he mustn't be summing we mustn't be summing you mustn't be summing they mustn't be summing
Perfecto	Perfecto con V-ing
I mustn't have summed you mustn't have summed he mustn't have summed we mustn't have summed you mustn't have summed they mustn't have summed	I mustn't have been summing you mustn't have been summing he mustn't have been summing we mustn't have been summing you mustn't have been summing they mustn't have been summing

Forma interrogativa

Forma simple	Forma con V-ing
must I sum? must you sum? must he sum? must we sum? must you sum? must they sum?	must I be summing? must you be summing? must he be summing? must we be summing? must you be summing? must they be summing?
Perfecto	Perfecto con V-ing
must I have summed? must you have summed? must he have summed? must we have summed? must you have summed? must they have summed?	must I have been summing? must you have been summing? must he have been summing? must we have been summing? must you have been summing? must they have been summing?

Forma interro-negativa

Forma simple	Forma con V-ing
mustn't I sum? mustn't you sum? mustn't he sum? mustn't we sum? mustn't you sum? mustn't they sum?	mustn't I be summing? mustn't you be summing? mustn't he be summing? mustn't we be summing? mustn't you be summing? mustn't they be summing?
Perfecto	Perfecto con V-ing
mustn't I have summed? mustn't you have summed? mustn't he have summed? mustn't we have summed? mustn't you have summed? mustn't they have summed?	mustn't I have been summing? mustn't you have been summing? mustn't he have been summing? mustn't we have been summing? mustn't you have been summing? mustn't they have been summing?