I must burp you must burp he must burp we must burp you must burp they must burp
Forma con V-ing
I must be burping you must be burping he must be burping we must be burping you must be burping they must be burping
Perfecto
I must have burped you must have burped he must have burped we must have burped you must have burped they must have burped
Perfecto con V-ing
I must have been burping you must have been burping he must have been burping we must have been burping you must have been burping they must have been burping
Negación
Forma simple
I must not burp you must not burp he must not burp we must not burp you must not burp they must not burp
Forma con V-ing
I must not be burping you must not be burping he must not be burping we must not be burping you must not be burping they must not be burping
Perfecto
I must not have burped you must not have burped he must not have burped we must not have burped you must not have burped they must not have burped
Perfecto con V-ing
I must not have been burping you must not have been burping he must not have been burping we must not have been burping you must not have been burping they must not have been burping
Forma interrogativa
Forma simple
must I burp? must you burp? must he burp? must we burp? must you burp? must they burp?
Forma con V-ing
must I be burping? must you be burping? must he be burping? must we be burping? must you be burping? must they be burping?
Perfecto
must I have burped? must you have burped? must he have burped? must we have burped? must you have burped? must they have burped?
Perfecto con V-ing
must I have been burping? must you have been burping? must he have been burping? must we have been burping? must you have been burping? must they have been burping?
Forma interro-negativa
Forma simple
must I not burp? must you not burp? must he not burp? must we not burp? must you not burp? must they not burp?
Forma con V-ing
must I not be burping? must you not be burping? must he not be burping? must we not be burping? must you not be burping? must they not be burping?
Perfecto
must I not have burped? must you not have burped? must he not have burped? must we not have burped? must you not have burped? must they not have burped?
Perfecto con V-ing
must I not have been burping? must you not have been burping? must he not have been burping? must we not have been burping? must you not have been burping? must they not have been burping?