I must burp you must burp he must burp we must burp you must burp they must burp
Forme en 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
Perfect
I must have burped you must have burped he must have burped we must have burped you must have burped they must have burped
Perfect en 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
Négation
Forme simple
I mustn't burp you mustn't burp he mustn't burp we mustn't burp you mustn't burp they mustn't burp
Forme en V-ing
I mustn't be burping you mustn't be burping he mustn't be burping we mustn't be burping you mustn't be burping they mustn't be burping
Perfect
I mustn't have burped you mustn't have burped he mustn't have burped we mustn't have burped you mustn't have burped they mustn't have burped
Perfect en V-ing
I mustn't have been burping you mustn't have been burping he mustn't have been burping we mustn't have been burping you mustn't have been burping they mustn't have been burping
Forme interrogative
Forme simple
must I burp? must you burp? must he burp? must we burp? must you burp? must they burp?
Forme en 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?
Perfect
must I have burped? must you have burped? must he have burped? must we have burped? must you have burped? must they have burped?
Perfect en 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?
Forme interro-négative
Forme simple
mustn't I burp? mustn't you burp? mustn't he burp? mustn't we burp? mustn't you burp? mustn't they burp?
Forme en V-ing
mustn't I be burping? mustn't you be burping? mustn't he be burping? mustn't we be burping? mustn't you be burping? mustn't they be burping?
Perfect
mustn't I have burped? mustn't you have burped? mustn't he have burped? mustn't we have burped? mustn't you have burped? mustn't they have burped?
Perfect en V-ing
mustn't I have been burping? mustn't you have been burping? mustn't he have been burping? mustn't we have been burping? mustn't you have been burping? mustn't they have been burping?