ought to overstrain
Regular verb: overstrain - overstrained- overstrained

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to overstrain
you ought to overstrain
he ought to overstrain
we ought to overstrain
you ought to overstrain
they ought to overstrain 	I ought to be overstraining
you ought to be overstraining
he ought to be overstraining
we ought to be overstraining
you ought to be overstraining
they ought to be overstraining	I ought to have overstrained
you ought to have overstrained
he ought to have overstrained
we ought to have overstrained
you ought to have overstrained
they ought to have overstrained	I ought to have been overstraining
you ought to have been overstraining
he ought to have been overstraining
we ought to have been overstraining
you ought to have been overstraining
they ought to have been overstraining	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I oughtn't to overstrain
you oughtn't to overstrain
he oughtn't to overstrain
we oughtn't to overstrain
you oughtn't to overstrain
they oughtn't to overstrain 	I oughtn't to be overstraining
you oughtn't to be overstraining
he oughtn't to be overstraining
we oughtn't to be overstraining
you oughtn't to be overstraining
they oughtn't to be overstraining	I oughtn't to have overstrained
you oughtn't to have overstrained
he oughtn't to have overstrained
we oughtn't to have overstrained
you oughtn't to have overstrained
they oughtn't to have overstrained	I oughtn't to have been overstraining
you oughtn't to have been overstraining
he oughtn't to have been overstraining
we oughtn't to have been overstraining
you oughtn't to have been overstraining
they oughtn't to have been overstraining	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought to I overstrain?
ought to you overstrain?
ought to he overstrain?
ought to we overstrain?
ought to you overstrain?
ought to they overstrain? 	ought to I be overstraining?
ought to you be overstraining?
ought to he be overstraining?
ought to we be overstraining?
ought to you be overstraining?
ought to they be overstraining? 	ought to I have overstrained?
ought to you have overstrained?
ought to he have overstrained?
ought to we have overstrained?
ought to you have overstrained?
ought to they have overstrained? 	ought to I have been overstraining?
ought to you have been overstraining?
ought to he have been overstraining?
ought to we have been overstraining?
ought to you have been overstraining?
ought to they have been overstraining? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
oughtn't I to overstrain?
oughtn't you to overstrain?
oughtn't he to overstrain?
oughtn't we to overstrain?
oughtn't you to overstrain?
oughtn't they to overstrain? 	oughtn't I to be overstraining?
oughtn't you to be overstraining?
oughtn't he to be overstraining?
oughtn't we to be overstraining?
oughtn't you to be overstraining?
oughtn't they to be overstraining? 	oughtn't I to have overstrained?
oughtn't you to have overstrained?
oughtn't he to have overstrained?
oughtn't we to have overstrained?
oughtn't you to have overstrained?
oughtn't they to have overstrained? 	oughtn't I to have been overstraining?
oughtn't you to have been overstraining?
oughtn't he to have been overstraining?
oughtn't we to have been overstraining?
oughtn't you to have been overstraining?
oughtn't they to have been overstraining?