can gnaw
Regular verb: gnaw - gnawed- gnawed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I can gnaw
you can gnaw
she can gnaw
we can gnaw
you can gnaw
they can gnaw 	I can be gnawing
you can be gnawing
she can be gnawing
we can be gnawing
you can be gnawing
they can be gnawing	I can have gnawed
you can have gnawed
she 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
she 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 can't gnaw
you can't gnaw
she can't gnaw
we can't gnaw
you can't gnaw
they can't gnaw 	I can't be gnawing
you can't be gnawing
she can't be gnawing
we can't be gnawing
you can't be gnawing
they can't be gnawing	I can't have gnawed
you can't have gnawed
she can't have gnawed
we can't have gnawed
you can't have gnawed
they can't have gnawed	I can't have been gnawing
you can't have been gnawing
she can't have been gnawing
we can't have been gnawing
you can't have been gnawing
they can't have been gnawing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
can I gnaw?
can you gnaw?
can she gnaw?
can we gnaw?
can you gnaw?
can they gnaw? 	can I be gnawing?
can you be gnawing?
can she be gnawing?
can we be gnawing?
can you be gnawing?
can they be gnawing? 	can I have gnawed?
can you have gnawed?
can she 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 she 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't I gnaw?
can't you gnaw?
can't she gnaw?
can't we gnaw?
can't you gnaw?
can't they gnaw? 	can't I be gnawing?
can't you be gnawing?
can't she be gnawing?
can't we be gnawing?
can't you be gnawing?
can't they be gnawing? 	can't I have gnawed?
can't you have gnawed?
can't she have gnawed?
can't we have gnawed?
can't you have gnawed?
can't they have gnawed? 	can't I have been gnawing?
can't you have been gnawing?
can't she have been gnawing?
can't we have been gnawing?
can't you have been gnawing?
can't they have been gnawing?