I must collapse you must collapse she must collapse we must collapse you must collapse they must collapse
Forme en V-ing
I must be collapsing you must be collapsing she must be collapsing we must be collapsing you must be collapsing they must be collapsing
Perfect
I must have collapsed you must have collapsed she must have collapsed we must have collapsed you must have collapsed they must have collapsed
Perfect en V-ing
I must have been collapsing you must have been collapsing she must have been collapsing we must have been collapsing you must have been collapsing they must have been collapsing
Négation
Forme simple
I mustn't collapse you mustn't collapse she mustn't collapse we mustn't collapse you mustn't collapse they mustn't collapse
Forme en V-ing
I mustn't be collapsing you mustn't be collapsing she mustn't be collapsing we mustn't be collapsing you mustn't be collapsing they mustn't be collapsing
Perfect
I mustn't have collapsed you mustn't have collapsed she mustn't have collapsed we mustn't have collapsed you mustn't have collapsed they mustn't have collapsed
Perfect en V-ing
I mustn't have been collapsing you mustn't have been collapsing she mustn't have been collapsing we mustn't have been collapsing you mustn't have been collapsing they mustn't have been collapsing
Forme interrogative
Forme simple
must I collapse? must you collapse? must she collapse? must we collapse? must you collapse? must they collapse?
Forme en V-ing
must I be collapsing? must you be collapsing? must she be collapsing? must we be collapsing? must you be collapsing? must they be collapsing?
Perfect
must I have collapsed? must you have collapsed? must she have collapsed? must we have collapsed? must you have collapsed? must they have collapsed?
Perfect en V-ing
must I have been collapsing? must you have been collapsing? must she have been collapsing? must we have been collapsing? must you have been collapsing? must they have been collapsing?
Forme interro-négative
Forme simple
mustn't I collapse? mustn't you collapse? mustn't she collapse? mustn't we collapse? mustn't you collapse? mustn't they collapse?
Forme en V-ing
mustn't I be collapsing? mustn't you be collapsing? mustn't she be collapsing? mustn't we be collapsing? mustn't you be collapsing? mustn't they be collapsing?
Perfect
mustn't I have collapsed? mustn't you have collapsed? mustn't she have collapsed? mustn't we have collapsed? mustn't you have collapsed? mustn't they have collapsed?
Perfect en V-ing
mustn't I have been collapsing? mustn't you have been collapsing? mustn't she have been collapsing? mustn't we have been collapsing? mustn't you have been collapsing? mustn't they have been collapsing?