I must burr you must burr he must burr we must burr you must burr they must burr
Forme en V-ing
I must be burring you must be burring he must be burring we must be burring you must be burring they must be burring
Perfect
I must have burred you must have burred he must have burred we must have burred you must have burred they must have burred
Perfect en V-ing
I must have been burring you must have been burring he must have been burring we must have been burring you must have been burring they must have been burring
Négation
Forme simple
I must not burr you must not burr he must not burr we must not burr you must not burr they must not burr
Forme en V-ing
I must not be burring you must not be burring he must not be burring we must not be burring you must not be burring they must not be burring
Perfect
I must not have burred you must not have burred he must not have burred we must not have burred you must not have burred they must not have burred
Perfect en V-ing
I must not have been burring you must not have been burring he must not have been burring we must not have been burring you must not have been burring they must not have been burring
Forme interrogative
Forme simple
must I burr? must you burr? must he burr? must we burr? must you burr? must they burr?
Forme en V-ing
must I be burring? must you be burring? must he be burring? must we be burring? must you be burring? must they be burring?
Perfect
must I have burred? must you have burred? must he have burred? must we have burred? must you have burred? must they have burred?
Perfect en V-ing
must I have been burring? must you have been burring? must he have been burring? must we have been burring? must you have been burring? must they have been burring?
Forme interro-négative
Forme simple
must I not burr? must you not burr? must he not burr? must we not burr? must you not burr? must they not burr?
Forme en V-ing
must I not be burring? must you not be burring? must he not be burring? must we not be burring? must you not be burring? must they not be burring?
Perfect
must I not have burred? must you not have burred? must he not have burred? must we not have burred? must you not have burred? must they not have burred?
Perfect en V-ing
must I not have been burring? must you not have been burring? must he not have been burring? must we not have been burring? must you not have been burring? must they not have been burring?