I must decease you must decease he must decease we must decease you must decease they must decease
Forme en V-ing
I must be deceasing you must be deceasing he must be deceasing we must be deceasing you must be deceasing they must be deceasing
Perfect
I must have deceased you must have deceased he must have deceased we must have deceased you must have deceased they must have deceased
Perfect en V-ing
I must have been deceasing you must have been deceasing he must have been deceasing we must have been deceasing you must have been deceasing they must have been deceasing
Négation
Forme simple
I must not decease you must not decease he must not decease we must not decease you must not decease they must not decease
Forme en V-ing
I must not be deceasing you must not be deceasing he must not be deceasing we must not be deceasing you must not be deceasing they must not be deceasing
Perfect
I must not have deceased you must not have deceased he must not have deceased we must not have deceased you must not have deceased they must not have deceased
Perfect en V-ing
I must not have been deceasing you must not have been deceasing he must not have been deceasing we must not have been deceasing you must not have been deceasing they must not have been deceasing
Forme interrogative
Forme simple
must I decease? must you decease? must he decease? must we decease? must you decease? must they decease?
Forme en V-ing
must I be deceasing? must you be deceasing? must he be deceasing? must we be deceasing? must you be deceasing? must they be deceasing?
Perfect
must I have deceased? must you have deceased? must he have deceased? must we have deceased? must you have deceased? must they have deceased?
Perfect en V-ing
must I have been deceasing? must you have been deceasing? must he have been deceasing? must we have been deceasing? must you have been deceasing? must they have been deceasing?
Forme interro-négative
Forme simple
must I not decease? must you not decease? must he not decease? must we not decease? must you not decease? must they not decease?
Forme en V-ing
must I not be deceasing? must you not be deceasing? must he not be deceasing? must we not be deceasing? must you not be deceasing? must they not be deceasing?
Perfect
must I not have deceased? must you not have deceased? must he not have deceased? must we not have deceased? must you not have deceased? must they not have deceased?
Perfect en V-ing
must I not have been deceasing? must you not have been deceasing? must he not have been deceasing? must we not have been deceasing? must you not have been deceasing? must they not have been deceasing?