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 must not combine you must not combine he must not combine we must not combine you must not combine they must not combine
Forma con V-ing
I must not be combining you must not be combining he must not be combining we must not be combining you must not be combining they must not be combining
Perfecto
I must not have combined you must not have combined he must not have combined we must not have combined you must not have combined they must not have combined
Perfecto con V-ing
I must not have been combining you must not have been combining he must not have been combining we must not have been combining you must not have been combining they must not 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
must I not combine? must you not combine? must he not combine? must we not combine? must you not combine? must they not combine?
Forma con V-ing
must I not be combining? must you not be combining? must he not be combining? must we not be combining? must you not be combining? must they not be combining?
Perfecto
must I not have combined? must you not have combined? must he not have combined? must we not have combined? must you not have combined? must they not have combined?
Perfecto con V-ing
must I not have been combining? must you not have been combining? must he not have been combining? must we not have been combining? must you not have been combining? must they not have been combining?