could discover
Verbo regular: discover - discovered- discovered

Afirmação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could discover
you could discover
he could discover
we could discover
you could discover
they could discover 	I could be discovering
you could be discovering
he could be discovering
we could be discovering
you could be discovering
they could be discovering	I could have discovered
you could have discovered
he could have discovered
we could have discovered
you could have discovered
they could have discovered	I could have been discovering
you could have been discovering
he could have been discovering
we could have been discovering
you could have been discovering
they could have been discovering	

Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
I could not discover
you could not discover
he could not discover
we could not discover
you could not discover
they could not discover 	I could not be discovering
you could not be discovering
he could not be discovering
we could not be discovering
you could not be discovering
they could not be discovering	I could not have discovered
you could not have discovered
he could not have discovered
we could not have discovered
you could not have discovered
they could not have discovered	I could not have been discovering
you could not have been discovering
he could not have been discovering
we could not have been discovering
you could not have been discovering
they could not have been discovering	

Forma interrogativa 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I discover?
could you discover?
could he discover?
could we discover?
could you discover?
could they discover? 	could I be discovering?
could you be discovering?
could he be discovering?
could we be discovering?
could you be discovering?
could they be discovering? 	could I have discovered?
could you have discovered?
could he have discovered?
could we have discovered?
could you have discovered?
could they have discovered? 	could I have been discovering?
could you have been discovering?
could he have been discovering?
could we have been discovering?
could you have been discovering?
could they have been discovering? 	

Forma interro-Negação 	
Forma simple 	Forma com V-ing 	Perfeito 	Perfeito com V-ing 	
could I not discover?
could you not discover?
could he not discover?
could we not discover?
could you not discover?
could they not discover? 	could I not be discovering?
could you not be discovering?
could he not be discovering?
could we not be discovering?
could you not be discovering?
could they not be discovering? 	could I not have discovered?
could you not have discovered?
could he not have discovered?
could we not have discovered?
could you not have discovered?
could they not have discovered? 	could I not have been discovering?
could you not have been discovering?
could he not have been discovering?
could we not have been discovering?
could you not have been discovering?
could they not have been discovering?