I must burl you must burl he must burl we must burl you must burl they must burl
Forme en V-ing
I must be burling you must be burling he must be burling we must be burling you must be burling they must be burling
Perfect
I must have burled you must have burled he must have burled we must have burled you must have burled they must have burled
Perfect en V-ing
I must have been burling you must have been burling he must have been burling we must have been burling you must have been burling they must have been burling
Négation
Forme simple
I must not burl you must not burl he must not burl we must not burl you must not burl they must not burl
Forme en V-ing
I must not be burling you must not be burling he must not be burling we must not be burling you must not be burling they must not be burling
Perfect
I must not have burled you must not have burled he must not have burled we must not have burled you must not have burled they must not have burled
Perfect en V-ing
I must not have been burling you must not have been burling he must not have been burling we must not have been burling you must not have been burling they must not have been burling
Forme interrogative
Forme simple
must I burl? must you burl? must he burl? must we burl? must you burl? must they burl?
Forme en V-ing
must I be burling? must you be burling? must he be burling? must we be burling? must you be burling? must they be burling?
Perfect
must I have burled? must you have burled? must he have burled? must we have burled? must you have burled? must they have burled?
Perfect en V-ing
must I have been burling? must you have been burling? must he have been burling? must we have been burling? must you have been burling? must they have been burling?
Forme interro-négative
Forme simple
must I not burl? must you not burl? must he not burl? must we not burl? must you not burl? must they not burl?
Forme en V-ing
must I not be burling? must you not be burling? must he not be burling? must we not be burling? must you not be burling? must they not be burling?
Perfect
must I not have burled? must you not have burled? must he not have burled? must we not have burled? must you not have burled? must they not have burled?
Perfect en V-ing
must I not have been burling? must you not have been burling? must he not have been burling? must we not have been burling? must you not have been burling? must they not have been burling?