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