I must burl you must burl he must burl we must burl you must burl they must burl
Forma con 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
Perfecto
I must have burled you must have burled he must have burled we must have burled you must have burled they must have burled
Perfecto con 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
Negación
Forma 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
Forma con 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
Perfecto
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
Perfecto con 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
Forma interrogativa
Forma simple
must I burl? must you burl? must he burl? must we burl? must you burl? must they burl?
Forma con 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?
Perfecto
must I have burled? must you have burled? must he have burled? must we have burled? must you have burled? must they have burled?
Perfecto con 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?
Forma interro-negativa
Forma 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?
Forma con 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?
Perfecto
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?
Perfecto con 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?