I must erect you must erect he must erect we must erect you must erect they must erect
Forme en V-ing
I must be erecting you must be erecting he must be erecting we must be erecting you must be erecting they must be erecting
Perfect
I must have erected you must have erected he 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 he must have been erecting we must have been erecting you must have been erecting they must have been erecting
Négation
Forme simple
I must not erect you must not erect he must not erect we must not erect you must not erect they must not erect
Forme en V-ing
I must not be erecting you must not be erecting he must not be erecting we must not be erecting you must not be erecting they must not be erecting
Perfect
I must not have erected you must not have erected he must not have erected we must not have erected you must not have erected they must not have erected
Perfect en V-ing
I must not have been erecting you must not have been erecting he must not have been erecting we must not have been erecting you must not have been erecting they must not have been erecting
Forme interrogative
Forme simple
must I erect? must you erect? must he erect? must we erect? must you erect? must they erect?
Forme en V-ing
must I be erecting? must you be erecting? must he be erecting? must we be erecting? must you be erecting? must they be erecting?
Perfect
must I have erected? must you have erected? must he 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 he have been erecting? must we have been erecting? must you have been erecting? must they have been erecting?
Forme interro-négative
Forme simple
must I not erect? must you not erect? must he not erect? must we not erect? must you not erect? must they not erect?
Forme en V-ing
must I not be erecting? must you not be erecting? must he not be erecting? must we not be erecting? must you not be erecting? must they not be erecting?
Perfect
must I not have erected? must you not have erected? must he not have erected? must we not have erected? must you not have erected? must they not have erected?
Perfect en V-ing
must I not have been erecting? must you not have been erecting? must he not have been erecting? must we not have been erecting? must you not have been erecting? must they not have been erecting?