must discover
Verbo regular: discover - discovered- discovered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com 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	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I mustn't discover
you mustn't discover
he mustn't discover
we mustn't discover
you mustn't discover
they mustn't discover 	I mustn't be discovering
you mustn't be discovering
he mustn't be discovering
we mustn't be discovering
you mustn't be discovering
they mustn't be discovering	I mustn't have discovered
you mustn't have discovered
he mustn't have discovered
we mustn't have discovered
you mustn't have discovered
they mustn't have discovered	I mustn't have been discovering
you mustn't have been discovering
he mustn't have been discovering
we mustn't have been discovering
you mustn't have been discovering
they mustn't have been discovering	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com 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-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
mustn't I discover?
mustn't you discover?
mustn't he discover?
mustn't we discover?
mustn't you discover?
mustn't they discover? 	mustn't I be discovering?
mustn't you be discovering?
mustn't he be discovering?
mustn't we be discovering?
mustn't you be discovering?
mustn't they be discovering? 	mustn't I have discovered?
mustn't you have discovered?
mustn't he have discovered?
mustn't we have discovered?
mustn't you have discovered?
mustn't they have discovered? 	mustn't I have been discovering?
mustn't you have been discovering?
mustn't he have been discovering?
mustn't we have been discovering?
mustn't you have been discovering?
mustn't they have been discovering?