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
she 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
she 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
she 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
she 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 ought not to perceive
you ought not to perceive
she ought not to perceive
we ought not to perceive
you ought not to perceive
they ought not to perceive 	I ought not to perceiving
you ought not to perceiving
she ought not to perceiving
we ought not to perceiving
you ought not to perceiving
they ought not to perceiving	I ought not to have perceived
you ought not to have perceived
she ought not to have perceived
we ought not to have perceived
you ought not to have perceived
they ought not to have perceived	I ought not to have been perceiving
you ought not to have been perceiving
she ought not to have been perceiving
we ought not to have been perceiving
you ought not to have been perceiving
they ought not 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 she 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 she 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 she 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 she 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 	
ought I not to perceive?
ought you not to perceive?
ought she not to perceive?
ought we not to perceive?
ought you not to perceive?
ought they not to perceive? 	ought I not to be perceiving?
ought you not to be perceiving?
ought she not to be perceiving?
ought we not to be perceiving?
ought you not to be perceiving?
ought they not to be perceiving? 	ought I not to have perceived?
ought you not to have perceived?
ought she not to have perceived?
ought we not to have perceived?
ought you not to have perceived?
ought they not to have perceived? 	ought I not to have been perceiving?
ought you not to have been perceiving?
ought she not to have been perceiving?
ought we not to have been perceiving?
ought you not to have been perceiving?
ought they not to have been perceiving?