ought to perceive
Regular verb: perceive - perceived- perceived

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I ought to perceive
you ought to perceive
he ought to perceive
we ought to perceive
you ought to perceive
they ought to perceive 	I ought to be perceiving
you ought to be perceiving
he ought to be perceiving
we ought to be perceiving
you ought to be perceiving
they ought to be perceiving	I ought to have perceived
you ought to have perceived
he ought to have perceived
we ought to have perceived
you ought to have perceived
they ought to have perceived	I ought to have been perceiving
you ought to have been perceiving
he ought to have been perceiving
we ought to have been perceiving
you ought to have been perceiving
they ought to have been perceiving	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I oughtn't to perceive
you oughtn't to perceive
he oughtn't to perceive
we oughtn't to perceive
you oughtn't to perceive
they oughtn't to perceive 	I oughtn't to be perceiving
you oughtn't to be perceiving
he oughtn't to be perceiving
we oughtn't to be perceiving
you oughtn't to be perceiving
they oughtn't to be perceiving	I oughtn't to have perceived
you oughtn't to have perceived
he oughtn't to have perceived
we oughtn't to have perceived
you oughtn't to have perceived
they oughtn't to have perceived	I oughtn't to have been perceiving
you oughtn't to have been perceiving
he oughtn't to have been perceiving
we oughtn't to have been perceiving
you oughtn't to have been perceiving
they oughtn't to have been perceiving	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
ought to I perceive?
ought to you perceive?
ought to he perceive?
ought to we perceive?
ought to you perceive?
ought to they perceive? 	ought to I be perceiving?
ought to you be perceiving?
ought to he be perceiving?
ought to we be perceiving?
ought to you be perceiving?
ought to they be perceiving? 	ought to I have perceived?
ought to you have perceived?
ought to he have perceived?
ought to we have perceived?
ought to you have perceived?
ought to they have perceived? 	ought to I have been perceiving?
ought to you have been perceiving?
ought to he have been perceiving?
ought to we have been perceiving?
ought to you have been perceiving?
ought to they have been perceiving? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
oughtn't I to perceive?
oughtn't you to perceive?
oughtn't he to perceive?
oughtn't we to perceive?
oughtn't you to perceive?
oughtn't they to perceive? 	oughtn't I to be perceiving?
oughtn't you to be perceiving?
oughtn't he to be perceiving?
oughtn't we to be perceiving?
oughtn't you to be perceiving?
oughtn't they to be perceiving? 	oughtn't I to have perceived?
oughtn't you to have perceived?
oughtn't he to have perceived?
oughtn't we to have perceived?
oughtn't you to have perceived?
oughtn't they to have perceived? 	oughtn't I to have been perceiving?
oughtn't you to have been perceiving?
oughtn't he to have been perceiving?
oughtn't we to have been perceiving?
oughtn't you to have been perceiving?
oughtn't they to have been perceiving?