could gnaw
Verbo regular: gnaw - gnawed- gnawed

Afirmación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could gnaw
you could gnaw
he could gnaw
we could gnaw
you could gnaw
they could gnaw 	I could be gnawing
you could be gnawing
he could be gnawing
we could be gnawing
you could be gnawing
they could be gnawing	I could have gnawed
you could have gnawed
he could have gnawed
we could have gnawed
you could have gnawed
they could have gnawed	I could have been gnawing
you could have been gnawing
he could have been gnawing
we could have been gnawing
you could have been gnawing
they could have been gnawing	

Negación 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
I could not gnaw
you could not gnaw
he could not gnaw
we could not gnaw
you could not gnaw
they could not gnaw 	I could not be gnawing
you could not be gnawing
he could not be gnawing
we could not be gnawing
you could not be gnawing
they could not be gnawing	I could not have gnawed
you could not have gnawed
he could not have gnawed
we could not have gnawed
you could not have gnawed
they could not have gnawed	I could not have been gnawing
you could not have been gnawing
he could not have been gnawing
we could not have been gnawing
you could not have been gnawing
they could not have been gnawing	

Forma interrogativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I gnaw?
could you gnaw?
could he gnaw?
could we gnaw?
could you gnaw?
could they gnaw? 	could I be gnawing?
could you be gnawing?
could he be gnawing?
could we be gnawing?
could you be gnawing?
could they be gnawing? 	could I have gnawed?
could you have gnawed?
could he have gnawed?
could we have gnawed?
could you have gnawed?
could they have gnawed? 	could I have been gnawing?
could you have been gnawing?
could he have been gnawing?
could we have been gnawing?
could you have been gnawing?
could they have been gnawing? 	

Forma interro-negativa 	
Forma simple 	Forma con V-ing 	Perfecto 	Perfecto con V-ing 	
could I not gnaw?
could you not gnaw?
could he not gnaw?
could we not gnaw?
could you not gnaw?
could they not gnaw? 	could I not be gnawing?
could you not be gnawing?
could he not be gnawing?
could we not be gnawing?
could you not be gnawing?
could they not be gnawing? 	could I not have gnawed?
could you not have gnawed?
could he not have gnawed?
could we not have gnawed?
could you not have gnawed?
could they not have gnawed? 	could I not have been gnawing?
could you not have been gnawing?
could he not have been gnawing?
could we not have been gnawing?
could you not have been gnawing?
could they not have been gnawing?