I must assist you must assist he must assist we must assist you must assist they must assist
Forma con V-ing
I must be assisting you must be assisting he must be assisting we must be assisting you must be assisting they must be assisting
Perfecto
I must have assisted you must have assisted he must have assisted we must have assisted you must have assisted they must have assisted
Perfecto con V-ing
I must have been assisting you must have been assisting he must have been assisting we must have been assisting you must have been assisting they must have been assisting
Negación
Forma simple
I must not assist you must not assist he must not assist we must not assist you must not assist they must not assist
Forma con V-ing
I must not be assisting you must not be assisting he must not be assisting we must not be assisting you must not be assisting they must not be assisting
Perfecto
I must not have assisted you must not have assisted he must not have assisted we must not have assisted you must not have assisted they must not have assisted
Perfecto con V-ing
I must not have been assisting you must not have been assisting he must not have been assisting we must not have been assisting you must not have been assisting they must not have been assisting
Forma interrogativa
Forma simple
must I assist? must you assist? must he assist? must we assist? must you assist? must they assist?
Forma con V-ing
must I be assisting? must you be assisting? must he be assisting? must we be assisting? must you be assisting? must they be assisting?
Perfecto
must I have assisted? must you have assisted? must he have assisted? must we have assisted? must you have assisted? must they have assisted?
Perfecto con V-ing
must I have been assisting? must you have been assisting? must he have been assisting? must we have been assisting? must you have been assisting? must they have been assisting?
Forma interro-negativa
Forma simple
must I not assist? must you not assist? must he not assist? must we not assist? must you not assist? must they not assist?
Forma con V-ing
must I not be assisting? must you not be assisting? must he not be assisting? must we not be assisting? must you not be assisting? must they not be assisting?
Perfecto
must I not have assisted? must you not have assisted? must he not have assisted? must we not have assisted? must you not have assisted? must they not have assisted?
Perfecto con V-ing
must I not have been assisting? must you not have been assisting? must he not have been assisting? must we not have been assisting? must you not have been assisting? must they not have been assisting?