I can gnaw you can gnaw he can gnaw we can gnaw you can gnaw they can gnaw
V-ing form
I can be gnawing you can be gnawing he can be gnawing we can be gnawing you can be gnawing they can be gnawing
Perfect
I can have gnawed you can have gnawed he can have gnawed we can have gnawed you can have gnawed they can have gnawed
V-ing perfect
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
I cannot gnaw you cannot gnaw he cannot gnaw we cannot gnaw you cannot gnaw they cannot gnaw
V-ing form
I cannot be gnawing you cannot be gnawing he cannot be gnawing we cannot be gnawing you cannot be gnawing they cannot be gnawing
Perfect
I cannot have gnawed you cannot have gnawed he cannot have gnawed we cannot have gnawed you cannot have gnawed they cannot have gnawed
V-ing perfect
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
can I gnaw? can you gnaw? can he gnaw? can we gnaw? can you gnaw? can they gnaw?
V-ing form
can I be gnawing? can you be gnawing? can he be gnawing? can we be gnawing? can you be gnawing? can they be gnawing?
Perfect
can I have gnawed? can you have gnawed? can he have gnawed? can we have gnawed? can you have gnawed? can they have gnawed?
V-ing perfect
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
can I not gnaw? can you not gnaw? can he not gnaw? can we not gnaw? can you not gnaw? can they not gnaw?
V-ing form
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?
Perfect
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?
V-ing perfect
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?