must unburden
Verbo regular: unburden - unburdened- unburdened

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must unburden
you must unburden
he must unburden
we must unburden
you must unburden
they must unburden 	I must be unburdening
you must be unburdening
he must be unburdening
we must be unburdening
you must be unburdening
they must be unburdening	I must have unburdened
you must have unburdened
he must have unburdened
we must have unburdened
you must have unburdened
they must have unburdened	I must have been unburdening
you must have been unburdening
he must have been unburdening
we must have been unburdening
you must have been unburdening
they must have been unburdening	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not unburden
you must not unburden
he must not unburden
we must not unburden
you must not unburden
they must not unburden 	I must not be unburdening
you must not be unburdening
he must not be unburdening
we must not be unburdening
you must not be unburdening
they must not be unburdening	I must not have unburdened
you must not have unburdened
he must not have unburdened
we must not have unburdened
you must not have unburdened
they must not have unburdened	I must not have been unburdening
you must not have been unburdening
he must not have been unburdening
we must not have been unburdening
you must not have been unburdening
they must not have been unburdening	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I unburden?
must you unburden?
must he unburden?
must we unburden?
must you unburden?
must they unburden? 	must I be unburdening?
must you be unburdening?
must he be unburdening?
must we be unburdening?
must you be unburdening?
must they be unburdening? 	must I have unburdened?
must you have unburdened?
must he have unburdened?
must we have unburdened?
must you have unburdened?
must they have unburdened? 	must I have been unburdening?
must you have been unburdening?
must he have been unburdening?
must we have been unburdening?
must you have been unburdening?
must they have been unburdening? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not unburden?
must you not unburden?
must he not unburden?
must we not unburden?
must you not unburden?
must they not unburden? 	must I not be unburdening?
must you not be unburdening?
must he not be unburdening?
must we not be unburdening?
must you not be unburdening?
must they not be unburdening? 	must I not have unburdened?
must you not have unburdened?
must he not have unburdened?
must we not have unburdened?
must you not have unburdened?
must they not have unburdened? 	must I not have been unburdening?
must you not have been unburdening?
must he not have been unburdening?
must we not have been unburdening?
must you not have been unburdening?
must they not have been unburdening?