could derive
Verbo regolare: derive - derived- derived

Affermazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I could derive
you could derive
he could derive
we could derive
you could derive
they could derive 	I could be deriving
you could be deriving
he could be deriving
we could be deriving
you could be deriving
they could be deriving	I could have derived
you could have derived
he could have derived
we could have derived
you could have derived
they could have derived	I could have been deriving
you could have been deriving
he could have been deriving
we could have been deriving
you could have been deriving
they could have been deriving	

Negazione 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
I could not derive
you could not derive
he could not derive
we could not derive
you could not derive
they could not derive 	I could not be deriving
you could not be deriving
he could not be deriving
we could not be deriving
you could not be deriving
they could not be deriving	I could not have derived
you could not have derived
he could not have derived
we could not have derived
you could not have derived
they could not have derived	I could not have been deriving
you could not have been deriving
he could not have been deriving
we could not have been deriving
you could not have been deriving
they could not have been deriving	

Forma interrogativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I derive?
could you derive?
could he derive?
could we derive?
could you derive?
could they derive? 	could I be deriving?
could you be deriving?
could he be deriving?
could we be deriving?
could you be deriving?
could they be deriving? 	could I have derived?
could you have derived?
could he have derived?
could we have derived?
could you have derived?
could they have derived? 	could I have been deriving?
could you have been deriving?
could he have been deriving?
could we have been deriving?
could you have been deriving?
could they have been deriving? 	

Forma interro-negativa 	
Forma semplice 	Forma con V-ing 	Perfetto 	Perfetto con V-ing 	
could I not derive?
could you not derive?
could he not derive?
could we not derive?
could you not derive?
could they not derive? 	could I not be deriving?
could you not be deriving?
could he not be deriving?
could we not be deriving?
could you not be deriving?
could they not be deriving? 	could I not have derived?
could you not have derived?
could he not have derived?
could we not have derived?
could you not have derived?
could they not have derived? 	could I not have been deriving?
could you not have been deriving?
could he not have been deriving?
could we not have been deriving?
could you not have been deriving?
could they not have been deriving?