must discern
Verbo regular: discern - discerned- discerned

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must discern
you must discern
he must discern
we must discern
you must discern
they must discern 	I must be discerning
you must be discerning
he must be discerning
we must be discerning
you must be discerning
they must be discerning	I must have discerned
you must have discerned
he must have discerned
we must have discerned
you must have discerned
they must have discerned	I must have been discerning
you must have been discerning
he must have been discerning
we must have been discerning
you must have been discerning
they must have been discerning	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not discern
you must not discern
he must not discern
we must not discern
you must not discern
they must not discern 	I must not be discerning
you must not be discerning
he must not be discerning
we must not be discerning
you must not be discerning
they must not be discerning	I must not have discerned
you must not have discerned
he must not have discerned
we must not have discerned
you must not have discerned
they must not have discerned	I must not have been discerning
you must not have been discerning
he must not have been discerning
we must not have been discerning
you must not have been discerning
they must not have been discerning	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I discern?
must you discern?
must he discern?
must we discern?
must you discern?
must they discern? 	must I be discerning?
must you be discerning?
must he be discerning?
must we be discerning?
must you be discerning?
must they be discerning? 	must I have discerned?
must you have discerned?
must he have discerned?
must we have discerned?
must you have discerned?
must they have discerned? 	must I have been discerning?
must you have been discerning?
must he have been discerning?
must we have been discerning?
must you have been discerning?
must they have been discerning? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not discern?
must you not discern?
must he not discern?
must we not discern?
must you not discern?
must they not discern? 	must I not be discerning?
must you not be discerning?
must he not be discerning?
must we not be discerning?
must you not be discerning?
must they not be discerning? 	must I not have discerned?
must you not have discerned?
must he not have discerned?
must we not have discerned?
must you not have discerned?
must they not have discerned? 	must I not have been discerning?
must you not have been discerning?
must he not have been discerning?
must we not have been discerning?
must you not have been discerning?
must they not have been discerning?