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