I must combine you must combine he must combine we must combine you must combine they must combine
Forma con V-ing
I must be combining you must be combining he must be combining we must be combining you must be combining they must be combining
Perfecto
I must have combined you must have combined he must have combined we must have combined you must have combined they must have combined
Perfecto con V-ing
I must have been combining you must have been combining he must have been combining we must have been combining you must have been combining they must have been combining
Negación
Forma simple
I mustn't combine you mustn't combine he mustn't combine we mustn't combine you mustn't combine they mustn't combine
Forma con V-ing
I mustn't be combining you mustn't be combining he mustn't be combining we mustn't be combining you mustn't be combining they mustn't be combining
Perfecto
I mustn't have combined you mustn't have combined he mustn't have combined we mustn't have combined you mustn't have combined they mustn't have combined
Perfecto con V-ing
I mustn't have been combining you mustn't have been combining he mustn't have been combining we mustn't have been combining you mustn't have been combining they mustn't have been combining
Forma interrogativa
Forma simple
must I combine? must you combine? must he combine? must we combine? must you combine? must they combine?
Forma con V-ing
must I be combining? must you be combining? must he be combining? must we be combining? must you be combining? must they be combining?
Perfecto
must I have combined? must you have combined? must he have combined? must we have combined? must you have combined? must they have combined?
Perfecto con V-ing
must I have been combining? must you have been combining? must he have been combining? must we have been combining? must you have been combining? must they have been combining?
Forma interro-negativa
Forma simple
mustn't I combine? mustn't you combine? mustn't he combine? mustn't we combine? mustn't you combine? mustn't they combine?
Forma con V-ing
mustn't I be combining? mustn't you be combining? mustn't he be combining? mustn't we be combining? mustn't you be combining? mustn't they be combining?
Perfecto
mustn't I have combined? mustn't you have combined? mustn't he have combined? mustn't we have combined? mustn't you have combined? mustn't they have combined?
Perfecto con V-ing
mustn't I have been combining? mustn't you have been combining? mustn't he have been combining? mustn't we have been combining? mustn't you have been combining? mustn't they have been combining?