must discover
Verbo regular: discover - discovered- discovered

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must discover
you must discover
he must discover
we must discover
you must discover
they must discover 	I must be discovering
you must be discovering
he must be discovering
we must be discovering
you must be discovering
they must be discovering	I must have discovered
you must have discovered
he must have discovered
we must have discovered
you must have discovered
they must have discovered	I must have been discovering
you must have been discovering
he must have been discovering
we must have been discovering
you must have been discovering
they must have been discovering	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I must not discover
you must not discover
he must not discover
we must not discover
you must not discover
they must not discover 	I must not be discovering
you must not be discovering
he must not be discovering
we must not be discovering
you must not be discovering
they must not be discovering	I must not have discovered
you must not have discovered
he must not have discovered
we must not have discovered
you must not have discovered
they must not have discovered	I must not have been discovering
you must not have been discovering
he must not have been discovering
we must not have been discovering
you must not have been discovering
they must not have been discovering	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I discover?
must you discover?
must he discover?
must we discover?
must you discover?
must they discover? 	must I be discovering?
must you be discovering?
must he be discovering?
must we be discovering?
must you be discovering?
must they be discovering? 	must I have discovered?
must you have discovered?
must he have discovered?
must we have discovered?
must you have discovered?
must they have discovered? 	must I have been discovering?
must you have been discovering?
must he have been discovering?
must we have been discovering?
must you have been discovering?
must they have been discovering? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
must I not discover?
must you not discover?
must he not discover?
must we not discover?
must you not discover?
must they not discover? 	must I not be discovering?
must you not be discovering?
must he not be discovering?
must we not be discovering?
must you not be discovering?
must they not be discovering? 	must I not have discovered?
must you not have discovered?
must he not have discovered?
must we not have discovered?
must you not have discovered?
must they not have discovered? 	must I not have been discovering?
must you not have been discovering?
must he not have been discovering?
must we not have been discovering?
must you not have been discovering?
must they not have been discovering?