I must burl you must burl she must burl we must burl you must burl they must burl
Forma con V-ing
I must be burling you must be burling she must be burling we must be burling you must be burling they must be burling
Perfecto
I must have burled you must have burled she 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 she 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 she 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 she 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 she 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 she 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 she burl? must we burl? must you burl? must they burl?
Forma con V-ing
must I be burling? must you be burling? must she be burling? must we be burling? must you be burling? must they be burling?
Perfecto
must I have burled? must you have burled? must she 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 she 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 she 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 she 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 she 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 she not have been burling? must we not have been burling? must you not have been burling? must they not have been burling?