can gnaw
Regular verb: gnaw - gnawed- gnawed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can gnaw
you can gnaw
he can gnaw
we can gnaw
you can gnaw
they can gnaw 	I can be gnawing
you can be gnawing
he can be gnawing
we can be gnawing
you can be gnawing
they can be gnawing	I can have gnawed
you can have gnawed
he can have gnawed
we can have gnawed
you can have gnawed
they can have gnawed	I can have been gnawing
you can have been gnawing
he can have been gnawing
we can have been gnawing
you can have been gnawing
they can have been gnawing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I cannot gnaw
you cannot gnaw
he cannot gnaw
we cannot gnaw
you cannot gnaw
they cannot gnaw 	I cannot be gnawing
you cannot be gnawing
he cannot be gnawing
we cannot be gnawing
you cannot be gnawing
they cannot be gnawing	I cannot have gnawed
you cannot have gnawed
he cannot have gnawed
we cannot have gnawed
you cannot have gnawed
they cannot have gnawed	I cannot have been gnawing
you cannot have been gnawing
he cannot have been gnawing
we cannot have been gnawing
you cannot have been gnawing
they cannot have been gnawing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I gnaw?
can you gnaw?
can he gnaw?
can we gnaw?
can you gnaw?
can they gnaw? 	can I be gnawing?
can you be gnawing?
can he be gnawing?
can we be gnawing?
can you be gnawing?
can they be gnawing? 	can I have gnawed?
can you have gnawed?
can he have gnawed?
can we have gnawed?
can you have gnawed?
can they have gnawed? 	can I have been gnawing?
can you have been gnawing?
can he have been gnawing?
can we have been gnawing?
can you have been gnawing?
can they have been gnawing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I not gnaw?
can you not gnaw?
can he not gnaw?
can we not gnaw?
can you not gnaw?
can they not gnaw? 	can I not be gnawing?
can you not be gnawing?
can he not be gnawing?
can we not be gnawing?
can you not be gnawing?
can they not be gnawing? 	can I not have gnawed?
can you not have gnawed?
can he not have gnawed?
can we not have gnawed?
can you not have gnawed?
can they not have gnawed? 	can I not have been gnawing?
can you not have been gnawing?
can he not have been gnawing?
can we not have been gnawing?
can you not have been gnawing?
can they not have been gnawing?