I ought to perceive you ought to perceive he ought to perceive we ought to perceive you ought to perceive they ought to perceive
V-ing form
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
Perfect
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
V-ing perfect
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
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
V-ing form
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
Perfect
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
V-ing perfect
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
ought to I perceive? ought to you perceive? ought to he perceive? ought to we perceive? ought to you perceive? ought to they perceive?
V-ing form
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?
Perfect
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?
V-ing perfect
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
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?
V-ing form
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?
Perfect
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?
V-ing perfect
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?