ought to gnaw
Regular verb: gnaw - gnawed- gnawed

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to gnaw
you ought to gnaw
she ought to gnaw
we ought to gnaw
you ought to gnaw
they ought to gnaw 	I ought to be gnawing
you ought to be gnawing
she ought to be gnawing
we ought to be gnawing
you ought to be gnawing
they ought to be gnawing	I ought to have gnawed
you ought to have gnawed
she ought to have gnawed
we ought to have gnawed
you ought to have gnawed
they ought to have gnawed	I ought to have been gnawing
you ought to have been gnawing
she ought to have been gnawing
we ought to have been gnawing
you ought to have been gnawing
they ought to have been gnawing	

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

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought to I gnaw?
ought to you gnaw?
ought to she gnaw?
ought to we gnaw?
ought to you gnaw?
ought to they gnaw? 	ought to I be gnawing?
ought to you be gnawing?
ought to she be gnawing?
ought to we be gnawing?
ought to you be gnawing?
ought to they be gnawing? 	ought to I have gnawed?
ought to you have gnawed?
ought to she have gnawed?
ought to we have gnawed?
ought to you have gnawed?
ought to they have gnawed? 	ought to I have been gnawing?
ought to you have been gnawing?
ought to she have been gnawing?
ought to we have been gnawing?
ought to you have been gnawing?
ought to they have been gnawing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
oughtn't I to gnaw?
oughtn't you to gnaw?
oughtn't she to gnaw?
oughtn't we to gnaw?
oughtn't you to gnaw?
oughtn't they to gnaw? 	oughtn't I to be gnawing?
oughtn't you to be gnawing?
oughtn't she to be gnawing?
oughtn't we to be gnawing?
oughtn't you to be gnawing?
oughtn't they to be gnawing? 	oughtn't I to have gnawed?
oughtn't you to have gnawed?
oughtn't she to have gnawed?
oughtn't we to have gnawed?
oughtn't you to have gnawed?
oughtn't they to have gnawed? 	oughtn't I to have been gnawing?
oughtn't you to have been gnawing?
oughtn't she to have been gnawing?
oughtn't we to have been gnawing?
oughtn't you to have been gnawing?
oughtn't they to have been gnawing?