must underwork
Verbo regular: underwork - underworked- underworked

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must underwork
you must underwork
she must underwork
we must underwork
you must underwork
they must underwork 	I must be underworking
you must be underworking
she must be underworking
we must be underworking
you must be underworking
they must be underworking	I must have underworked
you must have underworked
she must have underworked
we must have underworked
you must have underworked
they must have underworked	I must have been underworking
you must have been underworking
she must have been underworking
we must have been underworking
you must have been underworking
they must have been underworking	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not underwork
you must not underwork
she must not underwork
we must not underwork
you must not underwork
they must not underwork 	I must not be underworking
you must not be underworking
she must not be underworking
we must not be underworking
you must not be underworking
they must not be underworking	I must not have underworked
you must not have underworked
she must not have underworked
we must not have underworked
you must not have underworked
they must not have underworked	I must not have been underworking
you must not have been underworking
she must not have been underworking
we must not have been underworking
you must not have been underworking
they must not have been underworking	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I underwork?
must you underwork?
must she underwork?
must we underwork?
must you underwork?
must they underwork? 	must I be underworking?
must you be underworking?
must she be underworking?
must we be underworking?
must you be underworking?
must they be underworking? 	must I have underworked?
must you have underworked?
must she have underworked?
must we have underworked?
must you have underworked?
must they have underworked? 	must I have been underworking?
must you have been underworking?
must she have been underworking?
must we have been underworking?
must you have been underworking?
must they have been underworking? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not underwork?
must you not underwork?
must she not underwork?
must we not underwork?
must you not underwork?
must they not underwork? 	must I not be underworking?
must you not be underworking?
must she not be underworking?
must we not be underworking?
must you not be underworking?
must they not be underworking? 	must I not have underworked?
must you not have underworked?
must she not have underworked?
must we not have underworked?
must you not have underworked?
must they not have underworked? 	must I not have been underworking?
must you not have been underworking?
must she not have been underworking?
must we not have been underworking?
must you not have been underworking?
must they not have been underworking?